Ecological Environmental Effects Research Articles

The Effect of Ecological Environment on Language-Minority Students’ Math and Reading Development: A Hierarchical Linear Analysis of a Longitudinal Study

ABSTRACT Research Findings: This study illustrated whether and how ecological environments are associated with language-minority students’ (N = 12,500) math and reading development from kindergarten to the eighth grade. Results identified the robust effects of preschool type, kindergarten length, classroom activities, parent-child reading, parent expectation, and teacher-child relationship on reading and math outcomes. In third and fifth grade, all significant predictors of reading outcome are at the family level: parent-child reading time and parent’s expectations. Additionally, parent-child reading time also significantly predicts LMSs’ reading in kindergarten. Meanwhile, predictors for math outcomes have a different pattern in the mid to late elementary periods. All predictors during this period are at the family level: parent-child reading time, parent showing love to children, and parent’s expectations. Lastly, the only significant predictor for eighth grade math is teacher-child closeness. Practice or Policy: The significant findings at different grade levels suggest a multifaceted approach to policy development, including (a) supporting parent engagement, (b) high-quality preschool, and (c) multicultural teacher education and professional development.

Simulating the interrelationships among population, water, ecology, and economy in urban agglomerations based on a system dynamics approach

China's urban agglomerations (UAs) gather most of China's population and economy, but they also facing serious water resources crisis and ecological risks. How to manage the interrelationships among the population, water, ecology, and economy (PWEE) in UAs is crucial for the future of China's urbanization development. Based on the system dynamics (SD) approach, we constructed an SD model for simulating the interrelationships among PWEE in UAs, elucidating the intricate nonlinear relationships between elements of the PWEE system through causal feedback processes and model equations. In addition, we take the Tianshan North slope urban agglomeration (TSNSUA) as an example, which is a representative area where water resources crisis and ecological risk coexist, and designed five scenarios to dynamically simulate the balance of water supply and demand under the high-density population and economic agglomeration, as well as the potential ecological environmental effects in the process of urban spatial expansion. Our findings include: (1) The existing water resources conditions of TSNSUA can continue to support the current population and economic growth rates. If the future development plan follows the status quo continuation scenario, the phenomenon of insufficient water supply will not occur on the premise that the water supply capacity remains at its current highest level. (2) TSNSUA's future urban spatial expansion is predicted to have less overall impact on the ecological environment, and the carbon peak target by 2030 has an opportunity to be achieved. (3) Appropriately reducing the proportion of agricultural water, while strengthening water-saving and ecological protection measures, can ensure that TSNSUA's population and economy maintain a medium to high growth rate. Based on scenario comparison, our recommendation to policymakers is to establish the development objectives of TSNSUA based on the comprehensive development scenario.

Research on the synergistic effects of urbanization and ecological environment in the Chengdu–Chongqing urban agglomeration based on the Haken model

The development of urbanization and the protection of the ecological environment are important aspects of sustainable development in urban agglomerations; thus, their coordination and synergy are crucial. Scholars in both China and other countries have conducted extensive research on the relationship between urbanization and the ecological environment from the perspective of coordinated development. However, there is a lack of research on the synergistic effects of urbanization and the ecological environment. Taking the Chengdu–Chongqing urban agglomeration as an example, this study uses the Haken model to analyze the synergistic evolution mechanism, development patterns, and future trends of urbanization and the ecological environment. This study draws the following conclusions: (1) while a synergistic development mechanism has been established between urbanization and the ecological environment, the current system is still in a stage of low-level synergy, and the control system’s parameter for the direction and path of evolution is urbanization. (2) From 2001 to 2020, the level of synergistic development between urbanization and the ecological environment was relatively low, mainly moving from low-level synergy to medium–low-level synergy to medium-level synergy. (3) There is a significant spatial disparity in the levels of synergistic development, for which the leading region centers on Chengdu and Chongqing in the northwest and southeast, respectively, and the lagging region comprises the eastern part of the urban agglomeration, mainly represented by Dazhou, Kaizhou, and Yunyang. (4) The future trend of synergistic development between urbanization and the ecological environment in the Chengdu–Chongqing urban agglomeration is promising but requires increased infrastructure construction in mountainous urban areas, enhanced cooperation and circulation in transportation, logistics, information and other aspects, and balanced improvements in the level of synergistic development between urbanization and the ecological environment. The study of the synergistic development effect of urbanization and the ecological environment in urban agglomerations is of great significance for reducing the negative impact of urbanization on the ecological environment, increasing the positive interaction between the two, and promoting sustainable development in urban agglomerations.

An analysis of the effectiveness of linguistic ecosystem building on local landscape language governance

Abstract With the social and economic development and the improvement of people’s living standards, people have put forward higher requirements for the governance of the ecological environment, and the goals for the management of local landscapes are becoming more and more diversified. This paper constructs a dynamic and coordinated GRL governance model according to the characteristics of local landscape language. It uses the gray correlation model to explore the correlation between the constituent factors of the damaging ecological environment effect. Taking the loess hills landscape of S province as the research object, the governance effect of ecological environment construction on vegetation, soil, and landscape patterns is explored. The study shows that after the environmental environment management, the number of landscape patches in the region increased by 18, and the fragmentation index of each landscape increased by 0.0475 Block / km2 on average, which increased the spatial structure complexity of the landscape. The study’s findings can provide theoretical guidance for managing local landscape language comprehensively and have a specific scientific basis.

A study of typical plant growth changes in response to drainage water and salt in ditch wetland in arid area

Agricultural drainage significantly affected the changes of soil moisture and salinity in ditch wetlands. These changes can profoundly impact the spatial distribution and evolution of ditch wetland vegetation, thereby affecting the ecological environmental effects of these wetlands. Consequently, it is imperative to investigate the response of typical plant growth to drainage and soil salt in ditch wetlands in arid regions. Based on the classical metapopulation conceptual framework model (Levins model), this study established a new model of plant growth change in ditch wetlands, incorporating the key variables (water level and soil salinity) of arid area ditch wetlands. The application of the Gaussian model facilitates the resolution of species growth rates and mortality rates within this model. The study focused on the main drainage ditch (ditch M) and the drainage bucket ditch (ditch N) in the Lubotan saline-alkali land in Fuping, Shaanxi Province. The results revealed the following key findings: 1) the model effectively simulates the response of plant growth changes to water level and soil salinity in ditch wetlands in arid regions, particularly plants in the reed area and transition area disturbed by single factors such as water level and soil salinity; 2) the germination period of Phragmites australis in the reed area thrives in a shallow moisture environment, and adjusting the water level of the drainage ditch can maintain optimal growth conditions for Phragmites australis; 3) during the germination period of Suaeda salsa in the transition area, soil salinity should not be excessively high, though a moderate increase in soil salinity can promote the germination and growth of Suaeda salsa; and 4) Suaeda salsa in the symbiotic area has a higher adaptability to the soil salinity, with change in biomass consistent with plants in the transition area. The model provides an explanation and prediction for the growth changes of plant communities in ditch wetlands under drainage conditions. By integrating this model with the impact of farmland drainage on water level and soil salinity in drainage ditches, effective drainage management measures can be formulated, offering scientific support for the construction of ecological irrigation areas.

Spatio-temporal evolution of land use and its eco-environmental effects in the Caohai National Nature Reserve of China

With the rapid development of social economy, the ecological environment problems caused by the change of wetland land use have been widely concerned. This paper takes the Caohai National Nature Reserve (CNNR) of China as the research object on the basis of referring to previous research results. Firstly, the remote sensing data was employed to examine the spatio-temporal evolution process of the CNNR from three aspects: land use structure change, land use dynamic degree and land use space change. Then the change of ecological environment quality was studied from the greenness, the wetness, the dryness and the heat. Based on the spatiotemporal changes of land use types and ecological environment quality in the CNNR from 2000 to 2020, a comprehensive index, the remote sensing ecological index (RSEI), was constructed to analyze the ecological environmental effects of land use changes. The results indicate that the land use changes in the CNNR went through two major periods: first, a period of rapid decline in cultivated land, and second, a period of sharp increase in constructed land. During the period of rapid decline in cultivated land, the ecological environment quality in the study area showed an upward trend. However, during the period of increased constructed land, the ecological environment quality gradually stabilized. This study provides a basis for the coordinated development of the ecological environment and social economy in the CNNR area.

Spatial variability and climate response characteristics of chemical components of Tussilago farfara L.

Tussilago farfara L. is a typical habitat-dominated herbal medicine. In this work, for evaluating the effect of ecological environment on its quality, an integrated approach based on chemical composition and maximum entropy (MaxEnt) model was developed. 52 batches of T. farfara were collected by field survey from different origins in Gansu Province and their HPLC fingerprints were established. 19 common peaks were specified and subjected to principal component analysis and orthogonal partial least squares-discriminant analysis. The result indicated the quality varied with the origins and the common peaks 12, 6, 9, 14, 19, and 1 was the key to distinguish their quality. The MaxEnt model consisting of 205 occurrence records and 14 environmental variables was constructed and used to predict the potential distribution of T. farfara in Gansu Province. The prediction results showed that the current suitable habitat area of T. farfara was about 94,547.03 km2, accounting for 22.2% of the total area of Gansu Province, and showed a trend of increasing and then decreasing with time under future climate scenarios. Moreover, the dominant factors affecting its distribution were specified as min temperature of coldest month, precipitation of wettest month, precipitation seasonality, mean diurnal range and elevation. Eventually, the correlation model between chemical composition and environmental variables was established, based on which a quality zoning map of T. farfara was drawn. The obtained results would provide a scientific reference for the conservation and utilization of wild resources and the selection of planting site of T. farfara.

Characteristics of Hydrogen and Oxygen Isotope Composition in Precipitation, Rivers, and Lakes in Wuhan and the Ecological Environmental Effects of Lakes

Wuhan has a dense network of rivers and lakes. Due to the city’s development, the water system has been fragmented, the degradation of lakes is becoming increasingly severe, and the eco-environment has been significantly damaged. By collecting samples of the central surface water bodies in Wuhan, including Yangtze River water, Han River water, lake water, and precipitation, and by utilizing hydrogen and oxygen isotopes and multivariate statistical methods, the hydraulic connectivity and ecological environmental effects between the Yangtze River, the Han River, and the lakes were revealed. The results indicated the following: (1) The local meteoric water Line (LMWL) in the Wuhan area was δD = 7.47δ18O + 1.77. The river water line equation was approximately parallel to the atmospheric precipitation line in the Wuhan area. The intercept and slope of the lake waterline equation were significantly smaller. The enrichment degree of δ18O and δD was Yangtze River < Hanjiang River < lake water. (2) The cluster analysis showed that the lakes could be divided into two types, i.e., inner-flow degraded (IFD) lakes and outer-flow ecological (OFE) lakes. Urban expansion has resulted in fragmentation of the IFD lakes, changing the connectivity between rivers and lakes and weakening the exchange of water bodies between the Yangtze River and lakes. Simultaneously, evaporation has caused hydrogen and oxygen isotope fractionation, resulting in the relative enrichment of isotopes. The IFD lakes included the Taizi Lake, Yehu Lake, and the Shenshan Lake. The OFE lakes and the Yangtze River were active, evaporation was weak, and the hydrogen and oxygen isotopes were relatively depleted, mainly including the Huangjia Lake, the East Lake, the Tangxun Lake, etc. (3) The excessive deuterium (d-excess) parameter values in the Yangtze River and the Han River water were positive. In contrast, the d values in the lakes were mainly negative. In the case of a weakened water cycle, the effect of evaporation enrichment on lake water δ18O and δD had a significant impact. It is suggested that the water system connection project of “North Taizi Lake-South Taizi Lake-Yangtze River” and the small lakes connecting to large lakes project of “Wild Lake-Shenshan Lake-Tangxun Lake” should be implemented in time to restore the water eco-environment.

Biogeochemical behavior and ecological environmental effects of fluoroquinolones.

Synthetic fluoroquinolones (FQs) are the third most commonly used antibiotics in the world and play an extremely important role in antibacterial drugs. The excessive use and discharge will alter ecological environment, with consequence on human health and global sustainable development. It is therefore of great significance for scientific use and management of FQs to systematically understand their biogeochemical behavior and eco-environmental effects. After drug administration in humans and animals, only a small part of FQs are transformed in vivo. The main transformation processes include formylation, acetylation, oxidation and cleavage of piperazine ring, defluorination and decarboxylation of aromatic core ring, etc. About 70% of the original drug and a small amount of transformed products would be migrated to the environment through excretion. After entering the environment, FQs and their transformation products mainly exist in environmental media such as water, soil and sediment, and undergo migration and transformation processes such as adsorption, photolysis and biodegradation. Adsorption facilitates transfer of FQs from medium to another. The photolysis mainly affects the C7-amine substituents of FQs, whereas the core structure of FQs remains intact. Biodegradation mainly refers to the degradation of FQs by microorganisms and microalgae, including piperazine modification of the piperazine ring such as acetylation and formylation, partial or complete ring cleavage, core structure decarboxylation, defluorination and conjugation formation. The migration and transformation processes of FQs cannot completely eliminate them from the environment. Instead, they would become "pseudo-persistent" pollutants, which seriously affect the behavior, growth and reproduction of algae, crustaceans and fish, change biogeochemical cycle, destroy aquatic environment, and stimulate microbial resistance and the generation of resistance genes. In the future, more in-depth studies should be conducted on the environmental behavior of FQs and their impacts on ecological environment, the risk assessment of microbial resistance and resistance genes of FQs, and the mechanism and effect of micro-biodegradation of FQs.

Population genetics analysis of Tolai hares (Lepus tolai) in Xinjiang, China using genome-wide SNPs from SLAF-seq and mitochondrial markers.

The main topic of population genetics and evolutionary biology is the influence of the ecological environment, geographical isolation, and climatic factors on population structure and history. Here, we estimated the genetic diversity, genetic structure, and population history of two subspecies of Tolai hares (Lepus tolai Pallas, 1778), L. t. lehmanni inhabiting Northern and Northwest Xinjiang and L. t. centrasiaticus inhabiting Central and Eastern Xinjiang using SNP of specific-length amplified fragment sequencing (SLAF-seq) and four mitochondrial DNA (mtDNA). Our results showed a relatively high degree of genetic diversity for Tolai hares, and the diversity of L. t. lehmanni was slightly higher than that of L. t. centrasiaticus, likely due to the more favorable ecological environment, such as woodlands and plains. Phylogenetic analysis from SNP and mtDNA indicated a rough phylogeographical distribution pattern among Tolai hares. Strong differentiation was found between the two subspecies and the two geographical groups in L. t. centrasiaticus, possibly due to the geographical isolation of mountains, basins, and deserts. However, gene flow was also detected between the two subspecies, which might be attributed to the Tianshan Corridor and the strong migration ability of hares. Tolai hare population differentiation occurred at approximately 1.2377 MYA. Population history analysis based on SNP and mtDNA showed that the Tolai hare population has a complex history and L. t. lehmanni was less affected by the glacial event, possibly because its geographic location and terrain conditions weaken the drastic climate fluctuations. In conclusion, our results indicated that the joint effect of ecological environment, geographic events, and climatic factors might play important roles in the evolutionary process of L. t. lehmanni and L. t. centrasiaticus, thus resulting in differentiation, gene exchange, and different population history.

The Source and Distribution of Tetracycline Antibiotics in China: A Review

In recent years, antibiotics have been listed as a new class of environmental pollutants. Tetracycline antibiotics (TCs) used in human medical treatment, animal husbandry and agricultural production are the most widely used antibiotics. Due to their wide range of activities and low cost, their annual consumption is increasing. TCs cannot be completely metabolized by humans and animals. They can be abused or overused, causing the continuous accumulation of TCs in the ecological environment and potential negative effects on non-target organisms. These TCs may spread into the food chain and pose a serious threat to human health and the ecology. Based on the Chinese environment, the residues of TCs in feces, sewage, sludge, soil and water were comprehensively summarized, as well as the potential transmission capacity of air. This paper collected the concentrations of TCs in different media in the Chinese environment, contributing to the collection of a TC pollutant database in China, and facilitating the monitoring and treatment of pollutants in the future.

Analysis of the effect of resources, environment and ecological environment synergistically affecting ecological economy based on coupling model

In order to study the effect analysis of resources, environment and ecological environment on ecological economy, the author proposes a method based on coupling model. Taking the relevant data of province A from 2001 to 2019 as the research basis, and screening indicators based on the response, state and driving force dimensions in the DPSIR model, construct the water environment DSR system and the economic DSR system, and obtain the comprehensive evaluation value and weight value of the system by means of the entropy weight method, the economic change and water environment assessment are briefly analyzed, and the coupling coordination degree of the two is discussed at the same time, and finally some suggestions for water environment optimization are put forward. Experimental results show that, the high-quality coupling degree of the total system cannot represent the content of the economic and water environment subsystems, and the collaborative goals, so it is necessary to conduct in-depth research on the degree of coordination. From the data in Table 4, it can be found that there is a significant difference in the degree of synergy between the two. Its synergy is in the range of 0.34799 to 0.93041, showing an upward trend year by year. It is proved that the coupled model can be used to analyze the effect of resources, environment, and ecological environment on the ecological economy.

尼泊尔社会经济-生态复合系统恢复力评价及影响因素辨识

PDF HTML阅读 XML下载 导出引用 引用提醒 尼泊尔社会经济-生态复合系统恢复力评价及影响因素辨识 DOI: 10.5846/stxb202202060297 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 中国科学院A类战略性先导科技专项项目（XDA20010302） Assessment of socioeconomic-ecological composite system resilience and its influencing factors analysis in Nepal Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:“一带一路”沿线部分国家处于生态环境脆弱、社会经济落后状态，开展社会经济-生态复合系统恢复力时空特征评估及关键要素识，对于实现"一带一路"倡议"走出去"战略和绿色丝路建设至关重要。基于社会发展、经济水平、基础设施建设、生态环境、自然灾害风险5个一级指标24个二级指标构建了社会经济-生态复合系统恢复力评价指标体系，利用主成分分析法和结构方程模型评价了2000-2015年尼泊尔县域尺度社会经济-生态复合系统恢复力并分析了其时空分异特征，厘清了影响社会经济-生态复合系统恢复力的关键因素及其影响机制。结果表明：①尼泊尔社会经济-生态复合系统恢复力在县域尺度上主要集中在中低和中等恢复力水平，而中高恢复力呈由南向北逐渐降低态势，南部地区以及位于中部发展区的首都加德满都河谷地区恢复力水平相对较高；②2000-2015年尼泊尔社会经济-生态复合系统恢复力在不同阶段呈现波动变化状态，2005年恢复力最优，2010和2015年部分区域恢复力降低明显，系统恢复力区域间差异逐步增大；③社会发展、经济水平、基础设施、建设生态环境和自然灾害风险对系统恢复力提升的总效应分别为0.99，0.07，0.11，0.89和-0.12；按照指标影响程度来看，尼泊尔提升恢复力的关键路径主要在于促进社会经济发展、改善生态环境、推动基础设施建设以及降低灾害风险。未来尼泊尔应依托"一带一路"建设平台加强与周边国家合作交流，提升社会保障与区域均衡发展，促进产业升级及积累资本，发展生态林业并加强灾害监测及决策支持系统建设，实现社会、经济和生态的协同与可持续发展。 Abstract:In the face of multiple crises and challenges brought by global change and intensified human activities, how to cope with various risks and maintain system resilience has become one of the important issues of regional sustainable development. The One Belt and One Road initiative is international economic cooperation initiative put forward by China, which aims to promote economic globalization and win-win international cooperation. While, some countries along the One Belt and One Road are in a fragile ecological environment and backward in social and economic development, such as Nepal whose socioeconomic-ecological composite system has potential low risk resistance characteristics. It is crucial to evaluate the spatiotemporal characteristics of the socioeconomic-ecological composite system resilience of typical countries and identify the key factors for the implementation of the "Go Global" strategy and the Green Silk Road construction. Taking Nepal as case study area, an index system for evaluating the resilience of the socioeconomic-ecological composite system was constructed based on five first-level indicators and 24 second-level indicators from the perspectives of social development, economic level, infrastructure construction, ecological environment, and the natural disaster risk. Then, based on principal component analysis and structural equation model, this paper evaluated the resilience of socioeconomic-ecological composite system at county-level in Nepal from 2000 to 2015, analyzed its temporal and spatial variation characteristics, and clarified the key factors influencing the resilience and its influencing mechanism. The results showed that at the county level, the resilience of the socioeconomic-ecological composite system in Nepal was mainly concentrated at the low and medium levels, while the resilience of the middle and high levels gradually decreased from south to north, and the resilience of the southern region and the Capital Kathmandu Valley in the central development zone was relatively high. In addition, from 2000 to 2015, the resilience of socioeconomic-ecological composite system in Nepal fluctuated and showed spatial differences at different stages. The resilience was the highest in 2005, and decreased significantly in some regions in 2010 and 2015, and the regional differences of the system resilience increased gradually. Moreover, the total effects of social development, economic level, infrastructure construction, ecological environment and natural disaster risk on resilience improvement were 0.99, 0.07, 0.11, 0.89 and -0.12, respectively. According to the effect degree of the factors, the key path to enhance Nepal's resilience mainly lay in promoting social and economic development, improving the ecological environment, promoting infrastructure construction and reducing disaster risk. In the future, Nepal should rely on the "One Belt and One Road Initiative" construction platform to strengthen cooperation and exchanges with neighboring countries, improve social security and the balanced regional development, promote industrial upgrading and capital accumulation, develop ecological forestry, strengthen disaster monitoring and decision support system construction, and realize social, economic and ecological coordination and sustainable development. 参考文献 相似文献 引证文献

Characteristic of phytoplankton community structure and its driving factors along the cascade reservoirs in the Lancang River

筑坝改变河流生源要素迁移转化过程及浮游植物群落分布特征,影响河流生态系统结构与功能。为探究梯级筑坝河流浮游植物群落结构特征及其关键驱动因子,2016年丰水期、2018和2021年丰、枯水期在澜沧江开展了浮游植物群落及相关环境要素的调研。本文重点对比分析了丰水期自然河道段和水库浮游植物间的差异,基于广义相加模型(GAM)建立浮游植物与环境要素间的关系,研究发现:丰水期浮游植物生物量显著高于枯水期,丰、枯水期浮游植物群落结构均呈现上游以硅藻门为主,中下游以绿藻门、蓝藻门为主的变化特征。营养盐和水库的水力停留时间(HRT)是导致上、下游浮游植物生物量差异的关键环境要素;总磷、水温和HRT是影响浮游植物群落多样性指数的主要环境要素;总磷、氨氮是影响丰富度指数的关键环境要素。本研究结果有助于深化理解梯级筑坝河流生态环境效应。;Dam construction changes the migration and transformation of biogenic elements and inevitably affecting the structure and function of river ecosystem. To explore the phytoplankton community characteristic and its driving factors along cascade reservoirs, we investigated the phytoplankton communities and environmental factors in wet seasons of 2016, 2018 and 2021, and dry seasons of 2018 and 2021 respectively, in a cascade river, the Lancang River. This study focused on the comparison of phytoplankton communities between natural riverine and reservoirs in wet seasons. The widely used generalized additive model (GAM) was applied to analyzed the complex relationships between phytoplankton and key environmental factors. The results showed that phytoplankton biomass in wet seasons was significantly higher than that in dry seasons. Phytoplankton community was dominated by diatoms in the upper reaches, and chlorophyta and cyanobacteria in the middle and lower reaches. Based on the GAM model, nutrients and hydraulic retention time (HRT) were the dominant environmental factors which contributed to phytoplankton biomass differences between upstream and downstream. Total phosphorus (TP), water temperature and HRT were the key environmental factors affecting the Shannon-Wiener diversity index. TP and ammonia nitrogen were the crucial environmental factors affecting the Margalef species richness index. These findings can help to deepen our understanding about the water ecological environment effects of cascade reservoirs.

Water and sediment changes and the eco-environment response characteristics in Three Gorges Reservoir after the impoundment

三峡水库举世瞩目,是长江保护与治理的关键性枢纽工程,水库自2003年蓄水运行后库区水沙条件均发生了显著改变,对库区水生态环境产生了深远影响。本文系统综述了三峡水库蓄水运行后库区的水流动力特性和泥沙淤积特性,总结了蓄水后水库的新水沙运动情况;从水库蓄水运行后水质参数特征,营养物质、重金属和典型有毒有机污染物的赋存特征等方面,分析了三峡水库库区新水沙变化条件下的水环境响应特征;基于水库蓄水前后浮游植物、底栖动物等重点生物群落的现存量和群落特征变化规律,探索了三峡水库新水沙变化条件下库区的水生态响应特征;最后对未来三峡水库运行下的水生态环境效应研究提出展望,本文可为三峡水库水生态环境保护科学研究和管理提供新的认识和决策参考。;The water-sediment conditions in the reservoir area had changed significantly after the operation of the Three Gorges Reservoir, which has had a profound impact on the water ecology of the reservoir area. In this paper, the dynamic characteristics of the water flow and sedimentation in the reservoir area before and after the operation of the Three Gorges Reservoir were summarized, and the changes in the water-sedimentation conditions after water storage were analyzed. The water environmental response characteristics under this newly formed water-sediment conditions were evaluated in terms of changes in water quality parameters, nutrients, heavy metals, and toxic organic pollutants after the reservoir storage. The ecological response characteristics of aquatic biotas were also explored based on the community changes of phytoplankton, benthic fauna and other key biological communities before and after the reservoir storage. Finally, the outlook for future research on the water ecological environmental effects of the Three Gorges Reservoir was proposed. This paper can provide support for the water ecological environment protection of the Three Gorges Reservoir.

西南喀斯特地区耕地撂荒生态环境效应研究进展

PDF HTML阅读 XML下载 导出引用 引用提醒 西南喀斯特地区耕地撂荒生态环境效应研究进展 DOI: 10.5846/stxb202104050878 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（42167044，42007054）；中国博士后科学基金项目（2020M673296）；贵州省研究生科研基金项目（黔教合YJSCXJH[2020]066） Research progress on the ecological environment effect of farmland abandonment in karst areas of Southwest China Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:耕地撂荒是多驱动力综合作用的结果，不同地域下的撂荒地生态环境影响具有其特殊性。针对当前西南喀斯特地区耕地撂荒现象，综述了目前在西南喀斯特地区撂荒地生态环境影响方面取得的研究进展及未来的研究展望。综合现有研究结果发现：①务农机会成本增加，以粗放经营为主要特点的隐性撂荒可能是现代石漠化发展的潜在动力；②喀斯特地区的土壤异质性决定了耕地撂荒后地块尺度的景观均质性或者区域尺度的景观异质性；③喀斯特地区耕地撂荒后植被恢复能在一定程度上改善土壤结构、维持土壤水分、促进土壤养分恢复；④撂荒初期土壤侵蚀加剧，撂荒后期植被恢复防治土壤侵蚀；⑤耕地撂荒植被恢复后增强了喀斯特地区植被碳汇、土壤碳汇和岩溶碳汇效应。未来，应明确隐性撂荒对喀斯特地区生态环境的具体影响，创新技术手段动态监测优等地和石漠化耕地的撂荒面积及趋势变化，定量显性撂荒在水土流失防治和石漠化生态恢复中的贡献，综合评估撂荒地的碳汇效应，从而为合理配置喀斯特地区耕地的社会、生态功能建言献策。 Abstract:Farmland abandonment is the result of comprehensive effects by multiple driving forces. Ecological environment impact by farmland abandonment has its particularity in different regions. Aiming at the current phenomenon of farmland abandonment in the southwest karst areas, this paper summarizes the current research progress and future research prospects on the ecological environment impact of farmland abandonment in karst areas of the southwest China. By summarizing existing studies on ecological and environmental effects by farmland abandonment, it revealed that:(1) the opportunity cost of farming increased. The implicit abandonment being mainly characterized by extensive management may be the potential driving force for modern development of rocky desertification; (2) The soil heterogeneity in the karst areas determines the landscape homogeneity at the plot scale or the landscape heterogeneity at the regional scale after a farmland abandoned; (3) Vegetation restoration after abandonment of farmland in karst areas can improve soil structure, maintain soil moisture and promote soil nutrient restoration to a certain extent; (4) Soil erosion intensifies in early stage of abandonment, and soil erosion will be prevented and controlled by restoration of vegetation in later stage of abandonment; (5) The restoration of vegetation on abandoned farmland enhances the effects of plant carbon sink, soil carbon sink and karst carbon sink in karst areas. In the future, the specific impact of implicit abandonment on ecological environment of karst areas should be clarified, innovative technical means should be used to dynamically monitor the abandoned area of prime farmland and rocky desertified farmland, as well as their abandonment trend changes, the contribution of explicit abandonment in soil erosion control and ecological restoration of rocky desertification should be quantified, and the carbon sink impact of abandoned land should be comprehensively assessed. Therefore, it may offer suggestions for the rational allocation of social and ecological functions of farmland in karst areas. 参考文献 相似文献 引证文献

Ecological Environmental Effects and Their Driving Factors of Land Use/Cover Change: The Case Study of Baiyangdian Basin, China

Due to the combined effects of the natural environment, climate change and human activities, profound changes have occurred in terms of the eco-environmental effects of land use/cover change (LUCC) in the Baiyangdian basin. Therefore, based on land remote sensing monitoring data from 2000 to 2020, the Eco-environmental Quality Index (EQI) was introduced in this study to measure the eco-environmental effects of land use change in the Baiyangdian basin. Subsequently, the GeoDetector model was applied to detect the formation mechanism of the eco-environmental effects in the Baiyangdian basin from 2000 to 2020. The results of the study showed that cropland, woodland and grassland were the most widely distributed land use types in the Baiyangdian basin. The area of cropland declined the most and was mostly converted to construction land. The EQI increased slightly during the study period. The eco-environment of the mountainous areas in the western part of the basin and in Baiyangdian Lake was better than that of other areas. Land use intensity had a significantly stronger influence on the quality of the eco-environment than other factors. The interaction between the influencing factors was mainly a non-linear enhancement and a two-factor enhancement, with non-linear enhancement dominating.

Effect Evaluation of Ecological Compensation for Strategic Mineral Resources Exploitation Based on VIKOR-AISM Model

Energy security and ecological and environmental security are some of the most basic and important preconditions for national development, and ecological compensation is an important institutional guarantee for construction of China’s ecological civilization. The Chinese government has always made it clear that it will “step up efforts to protect the ecosystem” and establish market-based and diversified ecological compensation mechanisms. However, the existing system and mechanism design of ecological environment protection has been unable to meet the needs of economic and social development in the new era. On the basis of the psychological account theory and prospect theory, this paper constructed an evaluation system of strategic mineral resources exploitation and ecological environmental protection effects in Western China using the VIKOR-AISM model. In this paper, the VIKOR-AISM model comprehensively considers the maximization of group utility and minimization of individual regrets, and conducts a cluster analysis based on the compromise value Q and its inflection k. The comprehensive ranking changes of evaluation subjects under different decision preferences and hesitation interval measures were studied according to the antagonist hierarchy topology. The research results provide decision-making support for China to formulate ecological compensation policies in line with regional characteristics.

Effects of genotype and ecological environment on the community structure and function of symbiotic bacteria in rhizosphere of ginseng

BackgroundGinseng, an important traditional Chinese medicine and a new resource food, has two production modes: farmland ginseng and forestland ginseng. Ginseng faces many problems such as high soil bulk density, easy hardening, low nutrient content, reduced porosity and increased soil acidification because of continuous cropping. Increasing studies indicate that plant rhizosphere symbiotic bacteria have an important effect on plant growth and development. We speculate that differences in microbial community may play an important role in promoting ginseng growth, development and health. To reveal the differences between farmland and forestland ginseng cultivation, and to address problems associated with continuous ginseng cropping, we investigated the effects of differences in plant rhizosphere symbiotic bacterial communities in promoting ginseng growth, development, and health.ResultIn the present study, the microbial communities in the rhizosphere of different genotypes and ecological environments were analyzed using the high-throughput sequencing platform Illumina, phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt), and other technologies. The organic matter, total nitrogen, available nitrogen, and available phosphorus contents in forestland soil were significantly different from those in farmland. The bacterial communities of ginseng in forestland, farmland, and greenhouse environments have specific dominant groups at the phylum and genus levels. There were differences in the gene functions of ginseng root-related bacterial communities between forestland and farmland. There were significant differences in the abundance distribution of rhizosphere bacteria among the different genotypes at the phylum and genus levels.ConclusionsThere is a close relationship between the ecological environment and bacterial population structure, and the ecological environment of forestland is more conducive to the formation of rich rhizosphere bacterial populations; additionally, the genetic diversity is richer than that of farmland. The rhizosphere bacterial community structure of ginseng was influenced by genotype, and there was a correlation between the distance between ginseng genotypes and the stratified clustering of its rhizosphere bacterial community structure.

Sustainable Development Research of Green Smart Park in High-End Manufacturing Based on Internet of Things.

During the transition from industrial production to intelligent, there are still a large number of manufacturing industries in the traditional production mode. The problems of slow information transmission, difficult integrated production management, and complicated process parameter control have led to disconnect decision-making from actual production. In addition, the current manufacturing industry is more of a traditional management method, and the upgrade and iteration speed are slow, and it is not combined with the technology of the Internet of Things. Therefore, the purpose of this article is to use the Internet of Things monitoring technology to explore the improvement of high-end manufacturing and analyze the problems and solutions in the process of consistency of ecological environment and economic effects. This article will use the research methods of specific problems and specific analysis to compare the data and draw conclusions. This article will discuss the technical mechanism of the Internet of Things monitoring and introduce the collection and data of production status data of each station equipment in the production workshop during the production process: improving the current production model, learning foreign experience at the same time, quickly carrying out load curve and data center data accumulation on the service capabilities of the park, verifying multiple operating models, and simultaneously exploring new management models. Based on comparative advantage analysis, the study draws similarities and differences in the development of high-end manufacturing industries at home and abroad, learns advanced experience, proposes improved methods and paths, combines new environmental protection paths, and finally proposes energy operation in the park. Build a green and intelligent park to provide a theoretical reference for sustainable development. The research results show that computer monitoring technology and methods have effectively improved the production environment of high-end manufacturing, combined with the development status of the existing ecological and intelligent composite production system; the infrastructure construction of industrial parks in the new era, IT support, services, manpower resources, and industries has developed rapidly.