Wetland Resources Research Articles

Ecological-cultural inheritance in the wetlands: the non-linear transition to plant food production in the southern Levant

AbstractThe paper discusses a multi-proxy archaeobotanical dataset from the published macrobotanical and microbotanical research of 19 Epipalaeolithic sites over a period of 13.5 ka (ca. 25-11.5 ka cal bp) in the southern Levant. The archaeobotanical record includes over 200 phytolith samples extracted from sediments of 11 sites, macrobotanical evidence from seeds, plant tissues and wood charcoal from 11 sites and other microbotanical data from starches and starch spherulites from three sites. Phytolith assemblages show that Epipalaeolithic hunter-gatherers relied on wetland plant resources, and the macrobotanical evidence demonstrates the cultural importance of wetland resources to Late Epipalaeolithic foodways. The paper assesses the archaeobotanical data, using niche construction theory (NCT) to argue that human impacts in the wetlands over generations increased wetland productivity and created long-lasting ecological and cultural inheritances that allowed for the evolution and proliferation of a wetland-based system of wild plant food production. This paper proposes the idea that wetlands provided Epipalaeolithic people with a ‘domestication laboratory’ that allowed them to interact and modify their environment and also to experiment and gain new knowledge to build the long-lasting ecological-cultural inheritances necessary for the transition to plant food production. Importantly, the ecological-cultural inheritance of wild plant food production in the wetlands enabled the non-linear transition to cereal-based wild plant food production and domestication that took place in the southern Levant.

Temperate urban wetland plankton community stability driven by environmental variables, biodiversity, and resource use efficiency: A case of Hulanhe Wetland

In this study, we explored the driving factors behind plankton community structure. Due to the rapid development of cities, the occupation and development of wetland resources have increased lately, making the urban wetland ecosystems unstable and degrading the ecological functions gradually. Understanding the driving factors behind plankton community structure has certain theoretical and guiding significance for the protection, sustainable development, and ecological restoration of aquatic biodiversity in urban wetland ecosystems. We set up 12 sampling points in the Hulanhe Wetland, with the continuous monitoring of plankton from April to August and October 2021. The eco-environmental factors, plankton community structure, biodiversity index, resource use efficiency (RUE), and Bray–Curtis community turnover value were analyzed. A total of 209 species of 91 genera, 42 families, 11 classes, 22 orders of phytoplankton, and 90 species of four classes of zooplankton were identified. The community structure was mainly composed of Bacillariophyta, Chlorophyta, Cyanophyta, Protozoa, and Rotifera. To explore the correlation between phytoplankton and zooplankton, a correlation study was performed. We found a stable feeding preference between phytoplankton and zooplankton. The key influencing factors were identified by ordinary least squares regression, and the main driving factors of plankton community structure were discussed. The results showed that the stability of the Increased biodiversity and resource utilization efficiency have led to more stable plankton communities. This stability pattern is also strongly affected by water temperature, pH and total nitrogen in the external environment. This study will be helpful in the restoration of damaged wetlands, which would be beneficial for the protection of urban wetland ecosystems.

Wetland Ecological Restoration and Payment for Ecosystem Service Standard: A Case Study of Ganjiangyuan National Wetland Park

Wetland resources in wetland parks are unique natural resources. Discussing the ecological restoration and compensation standards of wetland parks plays an important guiding role in the construction of wetland protection systems. Based on the characteristics of wetland resources, using wetland ecosystem evaluation, ecosystem services evaluation, alternative cost, and conditional value methods, nine secondary indices were determined to evaluate the ecosystem services of Ganjiangyuan National Wetland Park. The results are as follows: (1) Ganjiangyuan National Wetland Park ecosystem evaluation result was “excellent,” the ecosystem service value of the wetland park is 43,922,014.39 yuan/hm2·year, among which the hydrology regulation value is the largest (19,257,869.14 yuan/hm2·year) and the food production value is the smallest (12,900.76 yuan/hm2·year). (2) The ecological restoration of Ganjiangyuan National Wetland Park should be based on improvements in hydrological regulations, waste treatment, entertainment culture, and biodiversity conservation. In conjunction with the strategic needs of wetland protection and social economy, wetland park restoration can contribute to urban development. (3) The upper and lower limits of the ecological compensation standard in the study area were calculated to be 310.49 and 257.87 yuan/hm2·year, respectively. Research shows that the ecosystem service value of wetland parks is huge, especially in terms of water conservation and waste treatment. It is necessary to pay attention to ecological benefits while reaping the economic benefits of wetland parks. Therefore, the results of this study provide a theoretical reference for the ecological compensation of wetland parks.

Analysis of Water Heat Flux and Drought based on Wetland Classification in the Yellow River Delta

To provide scientific basis for utilizing wetland resources, the drought conditions of different wetland types were evaluated in the Yellow River Delta. Based on the wetlands classification map, the difference in water and heat flux was studied, as well as the drought conditions in different wetlands. The relationship between the retrieved land surface temperature (LST) and evapotranspiration (ET) was analyzed through two section profiles in different directions using Geographic Information System (GIS) tools. The LST is relatively lower and the ET is relatively higher in areas mostly covered by wetlands of bush swamp, water body, saltern, and waterlogged lowland. On the whole, the ET values increase from inland to coastal areas, and the corresponding drought index decreases. There is a close negative correlation between ET and the regional water index (RWSI). The coefficients of the regression equations presented by different land use types such as swamp, built area, bush swamp, dry farmland, cultural pond, and other wetland types have slight differences. Generally, the non-wetland areas still show a large RWSI value, though the ET is relatively small. On the contrary, the artificial wetland is subjected to lower drought risk as indicated by its lower RWSI in spite of the high ET level. The RWSI of some natural wetland areas is larger than that of artificial ones, which indicates that proper utilization can reduce the drought risk to a certain extent in natural wetlands. Results showed that reasonable development of wetland resources may alleviate regional drought conditions.

Lakescape connectivity: Mobile fish consumers link Lake Michigan coastal wetland and nearshore food webs

AbstractIn large lake ecosystems, fish movement between coastal littoral habitats such as wetlands and the adjacent open‐water nearshore represents an understudied but potentially important linkage supporting energy flow and fisheries production. We hypothesized that yellow perch (Perca flavescens), an ecologically and economically important sport fish in the Laurentian Great Lakes, transport energy from highly productive wetlands to nearshore food webs, but that their role changes with ontogenetic shifts in diet and habitat use. We also predicted that the relative strength of such fish‐mediated habitat linkages would vary depending on physical connectivity across habitats. We collected perch and potential prey resources from seven paired coastal wetland–nearshore sites across three regions of Lake Michigan and quantified resource and habitat use with Bayesian stable isotope mixing models and otolith microchemistry. We found that juvenile perch collected in nearshore habitats showed high use of wetland resources, and that diets of wetland‐collected juveniles typically contained a smaller proportion of nearshore resources than did more mobile adults from the same wetland. The least hydrologically connected sites had lower cross‐habitat resource use (e.g., wetland‐collected perch consumed fewer nearshore resources and vice versa) compared with sites with greater levels of hydrological connectivity. Otolith microchemistry confirmed the linkages revealed by stable isotopes, suggesting that a dual approach can increase understanding of habitat linkages in large lakes. Quantifying the importance of multiple lentic habitats (i.e., “lakescape connectivity”) for fisheries production is critical for developing comprehensive large lake food web models and providing managers with information to prioritize locations for conservation and restoration.

Wetland Protection Law of the People’s Republic of China: New Efforts in Wetland Conservation

Abstract In June 2020, legislation on the protection of wetlands was included in the 2020 legislative work plan of the Standing Committee of the National People’s Congress of the People’s Republic of China. After three deliberations by the National People’s Congress, the ‘Wetland Protection Law’ (WPL) was approved on 24 December 2021, and officially entered force on 1 June 2022. The WPL consists of seven chapters and sixty five articles, including but not limited to resource management, protection and utilisation for wetland resources, wetland restoration, supervision and inspection, and legal responsibilities. This article reviews this new law with a focus on its main institutional content and innovations.

Plant Diversity and Quantitative Characteristics Of Wetland Community on the North Bank of Hanjiang River in Cheng GU, Shaanxi Province, China

Four water ecological surveys were carried out on the north bank of Hanjiang river in two seasons from 2020 to 2021. Based on the field wetland quadrat survey and literature data, the species diversity index was determined. The research showed that there are 360 species of wetland plants belonging to 108 families and 264 genera on the north bank of Hanjiang river, and the geographical composition of seed plants is at the genus level, mainly temperate distribution types, with 160 species. In the community species diversity index, the mean value of Patrick index was 18.80 ± 5.19. The mean Shannon Wiener diversity index was 2.15 ± 0.39. The mean value of Simpson dominance index was 0.81 ± 0.10. The average Pielou evenness index was 0.75 ± 0.10. The mean value of Margalef index was 3.44 ± 0.87. The Patrick index and Margalef index of the Bidens pilosa form were the lowest. The Shannon-Wiener diversity index，the Simpson index，and the Pielou index of the Potamogeton malaianus form were the lowest. The Patrick index of the Colocasia esculenta form was the highest,and the Pielou of the Sapium sebiferum form was the highest. The Shannon- Wiener diversity index and Simpson index of the Populus canadensis form group were the highest, and the Margalef index of the Flueggea virosa form was the highest. The research results provide basic data and scientific basis for the protection and restoration of wetland ecosystems and management of wetland resources in Yuan'an and similar areas. Bangladesh J. Bot. 51(4): 839-848, 2022 (December) Special

SETTLEMENT, AGRICULTURE, AND ENVIRONMENT AT AVENTURA, BELIZE: RESULTS OF NEW LIDAR RESEARCH

In 2009, the first LiDAR (Light Detection and Ranging) was flown over Caracol, Belize, transforming our understanding of Maya settlement, agriculture, and environment, and positioning the country of Belize as a leader in this transformation. Flown a decade later in 2019, this article reports on an 18 square kilometer LiDAR survey at Aventura, northern Belize. The National Center for Airborne Laser Mapping at the University of Houston used an Optech Titan sensor, the world’s first multispectral airborne LiDAR sensor, in the Aventura LiDAR survey. With approximately 25 points per square meter, we were able to maximize our detection of smaller features, as documented in ground truthing. LiDAR has two primary uses: (1) locating previously unidentified sites and (2) providing a complex human geography of ancient places that link people and land. This paper highlights how LiDAR facilitates the development of a human geography of ancient places. At Aventura, LiDAR research illustrates a human geography that links people, settlement, agricultural, and environment. Raised field agricultural systems at Aventura along the New River, and systems of bajos and pocket bajos, provide a window into understanding Aventura’s environmental positioning, wetland resources, and agrarian roots and insight into a broader New River agricultural-environmental system.

湿地保护、生态旅游与农民增收——以云南拉市海湿地为例

PDF HTML阅读 XML下载 导出引用 引用提醒 湿地保护、生态旅游与农民增收——以云南拉市海湿地为例 DOI: 10.5846/stxb202201100080 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家社会科学基金项目（18VSJ100）；国家自然科学基金项目（41571519）；中国人民大学2020年度拔尖创新人才培育资助计划成果 Wetland conservation, ecotourism and farmers' income: A case study of Lashihai Wetland in Yunnan, 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:生态保护与经济发展之间的矛盾是发展中国家普遍存在的问题。近年来中国开展了大规模的生态保护行动，但对于这些行动的经济效应评估主要集中在森林和草地保护，而对湿地保护鲜少关注。选取云南一个典型的高原湿地，基于当地实施的退耕还湿政策，运用倾向得分匹配（PSM）和双重差分法（DID）检验了退耕还湿对农民收入和生态旅游的长期动态影响，并进一步讨论了政策效果的异质性以及补偿资金在湿地保护中的作用。研究发现：（1）退耕还湿具有显著的增收效应，使人均收入提高了约40%，并促进了生态旅游的发展；（2）随着时间推移，退耕还湿对农民收入和生态旅游的促进作用不断增强，在多重因素的综合影响下，农民通过生计转型实现长期增收；（3）退耕还湿存在明显的异质性影响。在不同收入群体中，低收入和高收入群体的增收效应最明显，而对生态旅游的影响则主要体现在高收入群体中；此外，距离湿地资源越近的地区，农民越倾向于通过开展生态旅游实现增收；（4）补偿资金在湿地保护中具有双重作用，不仅在保护行动前期作为安全网维持农民收入不降低，而且作为启动市场和吸引民间资本参与的种子资金，进一步支持了生态旅游的发展。研究结果能够为湿地保护与社会经济协调发展提供新的实证证据。 Abstract:The conflict between ecological conservation and economic development is a common concern for the developing countries. In recent years, the Chinese government has carried out large-scale ecological conservation initiatives, but assessments of the economic effects of these initiatives have mainly focused on forest and grassland conservation, with little attention paid to wetland conservation. This paper provides some empirical evidences to understand the economic impact of wetland conservation in a region where development has been constrained by wetland conservation. The paper selects a typical highland wetland in Yunnan Province and uses propensity score matching (PSM) and difference in difference (DID) to examine the long-term dynamic effects of wetland conservation on farmers' income and ecotourism livelihoods based on the local policy of the Farmland to Wetland Conversion Program (FWCP), and further discusses the heterogeneity of policy effects and the role of compensation funds in wetland conservation. The results show that:(1) the FWCP has a significantly positive impact on the farmers' income, increasing per capita income by about 40% and promoting the development of eco-tourism livelihoods. (2) As time goes by, the role of the FWCP in promoting farmers' income and eco-tourism has continued to increase. Under the combined effect of multiple factors, the farmers achieved long-term income growth through livelihood transformation. (3) The FWCP has obviously heterogeneous effects. Among different income groups, low-income and high-income groups have the most obvious income-increasing effect, while the impact on ecotourism by the FWCP is mainly reflected in high-income groups, so there may be a risk of exacerbating local income inequality. In addition, the closer to the wetland resources, the more farmers tend to increase their income by developing ecotourism. (4) Compensation funds have a dual role in wetland conservation. Not only does it act as a safety net to maintain farmers' incomes from decreasing in the early stages of conservation action, but it also serves as seed money to stimulate market and induce social capital participation, further supporting the development of ecotourism. The findings of this paper can provide new empirical evidence for the coordinated development of wetland conversation and socio-economics. 参考文献 相似文献 引证文献

滨州市全民所有湿地资源资产所有权委托代理机制试点探索

滨州市全民所有湿地资源资产所有权委托代理机制试点探索

环境筛选和扩散限制对长江流域湖北段湿地植物群落构建的共同影响

PDF HTML阅读 XML下载 导出引用 引用提醒 环境筛选和扩散限制对长江流域湖北段湿地植物群落构建的共同影响 DOI: 10.5846/stxb202201110110 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 湖北省教育厅项目（T201701）；湖北省科技厅项目（2020CFA005）；国家自然科学基金项目（31570366） Environmental filtering and dispersal limitation jointly affect wetland plant community assembly in Hubei section of the Yangtze River Basin Author: Affiliation: Fund Project: Project of Department of Education of Hubei Province(T201701); Project of Department of Science and Technology of Hubei Province(2020CFA005);Project of National Natural Science Foundation of China(31570366) 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:湿地植物群落构建机制的研究可为湿地生态系统管理和受损湿地生态恢复与重建提供重要理论依据。地处长江流域的湖北省是我国湿地资源最为丰富的地区之一，通过野外调查研究了长江流域湖北段内不同类型湿地中的主要湿地植物群落类型，分析了研究区内湿地植物群落物种β多样性格局；利用相关性检验（Mantel test）方法和基于相似或相异度矩阵的多元回归模型（MRM）分析了环境差异和地理距离与湿地植物群落的物种相异性的相关性，及其对该区域湿地植物群落构建的相对贡献率。结果表明长江流域湖北段8个不同类型湿地内的湿地植物群落物种相异性指数差异显著，群落间物种相异性指数与地理距离和环境距离均呈显著正相关关系；MRM分析表明环境筛选和扩散限制共同解释了研究区内群落物种变异指数的54.72%；其中，环境距离独立解释率为22.03%，地理距离独立解释率为9.98%，二者联合解释率为22.71%。结果表明环境筛选和扩散限制共同影响了长江流域湖北段湿地植物群落构建过程，且环境筛选贡献更大。建议除了考虑空间尺度、环境因子、植被类型外，未来需进一步研究时间尺度及人类干扰等因子对该区域湿地植物群落构建的影响。 Abstract:Studies on the mechanism of wetland plant community assembly can provide an important theoretical basis for wetland ecosystem management and ecological restoration and reconstruction of the damaged wetlands. There are very abundant wetland resources in Hubei Province located in the Yangtze River Basin. In this study, we investigated main wetland plant communities by conducting the field survey and analyzed the β-diversity of wetland plant community in Hubei section of the Yangtze River Basin. The correlation between species dissimilarity of wetland plant communities and environmental distance and geographic distance, and relative contribution of environmental differences and geographic distance for accounting for community assembly were tested, using the Mantel test method and a multiple regression model based on similarity or dissimilarity matrices. The results showed that the species dissimilarity index of wetland plant communities in eight different types of wetlands in Hubei section of the Yangtze River Basin were significantly differed. The species dissimilarity indexes among wetland communities significantly were positively correlated with geographical distance and environmental differences. MRM analysis showed that environmental filtering and diffusion limitation together explained 54.72% of the community species variability index in the study area. The independent effects of the two tested hypotheses above mentioned were 22.03% and 9.98%, respectively. Our findings implied that the combined effects of environmental filtering and diffusion limitation decided wetland plant community assembly in Hubei section of the Yangtze River Basin, and in comparison to diffusion limitation, the environmental filtering had stronger effects. We argue that other factors, such as time scale and interference, should be considered in a study of wetland plant community assembly, beside spatial scale, environmental factors, and vegetation types. 参考文献 相似文献 引证文献

Value realization of ecological products of wetland resources: Basic logic, core mechanism and mode

Value realization of ecological products of wetland resources: Basic logic, core mechanism and mode

Evaluation of coastal wetland ecosystem services based on modified choice experimental model: A case study of mangrove wetland in Beibu Gulf, Guangxi

The evaluation of the service value of coastal wetland ecosystem is of great significance for the scientific development and effective utilization of coastal wetland resources. It has been proved that the addition of attribute cut-offs in the choice experiment (CE) evaluation framework improves the validity of evaluation results. However, whether this improvement is due to the improvement of the questionnaire or the improvement of the utility equation cannot be distinguished with this framework. In this study, the modified selection model with cut-off is used to assess the two key elements of the modified selection model that differ from the traditional model. These are the CE questionnaire that leads to cut-off and the CE utility equation that incorporates cut-off. Each element pair is analyzed separately. Both are utilized to evaluate the impact of the validity of the results, and quantitatively evaluate the service value of the mangrove wetland ecosystem in the Beibu Gulf region, Guangxi, China. The results showed that: In 2021, the total value of mangrove wetland ecosystem services in the Beibu Gulf region was 1.181 billion yuan. In the modified CE model, both the improvement of the questionnaire and the improvement of the utility equation contribute to the improvement of the validity of the evaluation results; their contribution degree is equal. Regarding the choice model, based on the correction, the public's willingness to pay per capita values for strengthening the protection of mangroves are (in order): the improvement of biodiversity, mangrove forest coverage, water quality, and the appreciation of the landscape. Related values are 53.89 yuan, 47.00 yuan, 35.46 yuan, and 17.29 yuan, respectively. The results provide a scientific basis for the formulation of ecological management policies of coastal wetlands by the government.

Wetland Area Change in Klaipeda County

Wetlands are the most important natural resources, they are the sources of biological, cultural, and economic diversity. The article presents an analysis of the current situation of the wetland area in Klaipeda county. Analytical, comparative, statistical, and logical analysis methods were used for the investigation. The aim of the investigation is to carry out the analysis of Klaipeda county's wetland area during the period between the years 2002 and 2022. In 2022, wetlands occupied 1.21 percent of Klaipeda's county, i.e. 6,337.53 ha. In 2002, the area of wetlands in Klaipeda county was 1.68 percent and occupied 8,748.33 ha. So, in Klaipeda county during the period between the years 2002 and 2022 wetland area decreased by 2,410.80 ha or 27.56 percent. After the analysis of the change in wetland areas in the districts of Klaipeda county, it can be seen that in all municipalities, wetland areas decreased in the period of 2002 – 2022. Many wetlands in Klaipeda county have been exploited and managed for various purposes. Large wetland areas have been drained and reclaimed mainly for agriculture and the establishment of human settlements. Monitoring and inventory of wetlands are important for of conserving and managing wetland resources. An important element of all peatland restoration projects is a programme of monitoring to check results and progress. The aim of the investigation is to carry out the analysis of the Klaipeda county wetland area during the period between the years 2002 and 2022.

Freshwater wetland–driven variation in sulfur isotope compositions: Implications for human paleodiet and ecological research

Sulfur isotope (δ34S) analyses are an important archaeological and ecological tool for understanding human and animal migration and diet, but δ34S can be difficult to interpret, particularly in archaeological human-mobility studies, when measured isotope compositions are strongly 34S-depleted relative to regional baselines. Sulfides, which accumulate under anoxic conditions and have distinctively low δ34S, are potentially key for understanding this but are often overlooked in studies of vertebrate δ34S. We analyze an ecologically wide range of archaeological taxa to build an interpretive framework for understanding the impact of sulfide-influenced δ34S on vertebrate consumers. Results provide the first demonstration that δ34S of higher-level consumers can be heavily impacted by freshwater wetland resource use. This source of δ34S variation is significant because it is linked to a globally distributed habitat and occurs at the bottom of the δ34S spectrum, which, for archaeologists, is primarily used for assessing human mobility. Our findings have significant implications for rethinking traditional interpretive frameworks of human mobility and diet, and for exploring the historical ecology of past freshwater wetland ecosystems. Given the tremendous importance of wetlands’ ecosystem services today, such insights on the structure and human dynamics of past wetlands could be valuable for guiding restoration work.

Effects of urbanization on coastal wetlands in the Sekondi-Takoradi Metropolis, Ghana

Abstract. Dadzie-Paintsil E, Mensah JV. 2022. Effects of urbanization on coastal wetlands in the Sekondi-Takoradi Metropolis, Ghana. Indo Pac J Ocean Life 6: 94-105. Wetlands play an important role in the livelihood of humankind; on the other hand, the reciprocal gesture on ecosystem protection is on the decline. The result is the loss of wetlands, especially in urban areas. This study examined the effects of urbanization on coastal wetlands in the Sekondi-Takoradi Metropolis of Western Region Ghana. Therefore, using a mixed-method research design, 358 respondents were sampled from the metropolis to respond to the data collection instruments: questionnaire, interview, and Focus Group Discussion (FGD). The Statistical Product and Service Solutions (SPSS) program version 14 was used to facilitate quantitative data analysis, while content analysis was used for qualitative data analysis. The major finding was that wetlands in the Sekondi-Takoradi Metropolis was affected by urbanization, resulting in the loss of some portions of the wetlands. Furthermore, wetlands were perceived as 'wastelands' which should be used for other use. One major recommendation is that residents should be sensitized by the Metropolis Assembly and the Environmental Protection Agency to appreciate the value of the coastal wetlands in the metropolis. Again, there should be the co-management of the wetland resources and the provision of alternative sources of livelihood by the local authority, central government, and concerned non-governmental organizations.

Data Stream Approach for Exploration of Droughts and Floods Driving Forces in the Dongting Lake Wetland

Wetlands are important environmental resources that are vulnerable to droughts and floods. Studying drought-flood events and their driving factors is essential for wetland resource planning and management. However, climate change and human activities present dynamic challenges that traditional approaches are unable to simulate dynamically in a rapidly changing environment. This makes quantitative analysis difficult. Our research focused on the innovative use of the data stream model, namely online bagging of Hoeffding adaptive trees, to quantify drought and flood drivers in response to climate change and human activity. The proposed approach was applied to a river-lake system, the Dongting Lake wetland. The frequency and duration characteristics of drought-flood events were analyzed. In addition, the cyclical changes of droughts and floods were analyzed by wavelet analysis. Then, drought-flood indicators as well as climatic and hydrological factors were entered into a dynamic data stream model for quantitative calculations. The results showed that the water conservancy projects largely reduced flood events while aggravating droughts. The frequency of floods decreased by 4.91% and the frequency of droughts increased by 6.81% following the construction of the Gezhouba Hydro-project and the Three Gorges Dam. Precipitation and Sankou streamflow were two dominant factors in the Dongting Lake drought and flood events, both of which had a feature importance value of approximately 0.3. This research showed how the data stream model can be used in a changing environment and the applicability of the conclusions reached through real-world instances. Moreover, these quantitative outputs can help in the sustainable utilization of Dongting Lake wetland resources.

Vietnam wetland cover map: using hydro-periods Sentinel-2 images and Google Earth Engine to explore the mapping method of tropical wetland

Tropical wetland resources have high ecological value to flood storage, greenhouse gas emissions, and biodiversity, with diverse types and widespread distribution. However, cloud pollution, inundation fluctuations, and spectral similarity pose unique challenges in the monitoring of tropical wetland using remote sensing. In this study, we proposed a comprehensive method for mapping the various types of tropical wetland using time series Sentinel-2 images based on the Google Earth Engine (GEE) platform integrated inundation dynamic, phenological, and geography features for multi-class topical wetland mapping (IPG-MTWM). Obtained a precise Vietnam wetland cover map (VWeC), which covers ten types of wetlands within a spatial resolution of 10 m. The overall accuracy (OA) of the VWeC was 82.07 %. compared the VWeC results with other wetland products showing the advantages of the IPG-MTWM in mapping complete wetland cover types with high spatial resolution and accuracy at large scales. The VWeC is the first thematic mapping on wetland cover types of Vietnam, it indicates that Vietnam has approximately 1,367,502.16 ha wetlands, of which coastal wetland accounts for approximately 44.27 % (605,318.3 ha). Vietnam’s wetlands are mainly distributed in South Vietnam (SV). The integrated inundation dynamic, phenological, and geography features method, highlights the potential of precise and fast multi-class topical wetland mapping at a large-scale using hydro-periods Sentinel-2 images and GEE platform. This study provides an important technique and dataset for tropical wetland monitoring, protection, and management.

Long-Term Spatiotemporal Changes in Ecosystem Services Caused by Coastal Wetland Type Transformation in China’s Hangzhou Bay

Coastal wetlands provide essential ecosystem services, while usually experiencing land transformation or degradation mainly due to intense anthropogenic activities and climate changes. Understanding the changes in wetlands ecosystem services is essential to decision makers for generating sound coastal planning. Hangzhou Bay is rich in wetland resources, and the urbanization of Hangzhou Bay in the past three decades has caused fundamental changes in the wetlands in the region. Based on the remote sensing images of the Hangzhou Bay area from 1990 to 2020, this paper analyzes the land use situation of the Hangzhou Bay area in seven periods. This paper calculates the area transfer matrix of various types of wetlands. It uses the InVEST model to evaluate the changes in the function of wetland ecosystem services in the Hangzhou Bay area. Hangzhou Bay wetlands show a trend of transferring natural wetlands to artificial and non-wetlands from 1990 to 2020. Carbon stocks fell by 14.24%. The annual water production decreased by 33.93% and then returned to the original level. The area of habitat degradation increased by 79.94%. The main influencing factors are paddy field degradation, increase in non-wetland area, and decrease in sea area. This paper proposes that the development and construction of farmland in the “red line” area and established wetland reserves are prohibited, and to strengthen the training of wetland management personnel, establish a sound decision-making consultation mechanism, and increase the scientific research expenditure on wetlands in the region.

CHANGES IN PHYSICAL ENVIRONMENT OF THE SOUTHWESTERN COASTAL BANGLADESH: A RIVER BASIN APPROACH

This study deals with the nature and state of geomorphic environmental changes of a coastal river basin at southwestern Bangladesh over a period of three decades (1973-2009). The study concentrates on the Kholpetua river basin, which receive fresh water flow from Betna in the upstream and tidal flow in the middle from Morichapa and finally drains to the Bay of Bengal through Kapotakshi River. The whole Kholpetua basin may be divided into three distinct parts: fresh water upstream, brackish water middle part and saline lower part.
 Large-scale population increase, both in the upper and middle basin; infrastructure development, in the form of road network and introduction of HYV rice in the floodplain of Betna and shrimp farming on the brackish water have lead to the loss of both quality and extent of wetland resources in the basin area, endangering the geomorphological balance in terms of input and output between upstream and downstream. A large section of Betna has dried-up, and most of the tributaries and distributaries of the Morichapa have been silted up, partly because of extensive polders of the sub-basin. As a result, energy exchange (through tide) between basin plains and channels ways has lost vitality.
 Multi-spectral remote sensing data, in conjunction with topographical maps and ancillary data analysis reveals that throughout the basin, a wide range of anthropogenic interference have physically altered the characteristic ecosystem of the basin. The agricultural land is about 79,395 ha. in 1973, which is reduced at about 53,328 ha in 2009. With 1779 to 2001, a strip of about 20 km wide mangrove forest has been disappeared. Such physical alteration has been initiated with the poldering of middle brackish water part of the basin and later with the introduction of extensive shrimp cultivation. Attempt has been made to explore the linkage of upstream landuse activities and drainage alteration to the hydrological and geomorphological behavior of the downstream basin areas, extrapolate ecological sensitivity of the basin.