Taizi River Research Articles

Derivation of predicted no-effect concentration and ecological risk for atrazine better based on reproductive fitness

Atrazine (ATZ) is an herbicide most commonly used in China and other regions of the world. It is reported toxic to aquatic organisms, and frequently occurs at relatively high concentrations. Currently, ATZ has been proved to affect reproduction of aquatic species at much lower levels. So it is controversial to perform ecological risk assessment using predicted no-effect concentrations (PENCs) derived from traditional endpoints, which fail to provide adequate protection to aquatic organisms. In this study, PNECs of ATZ were derived based on six endpoints of survival, growth, behavior, biochemistry, genetics and reproduction. The PNEC derived from reproductive lesion was 0.044μg ATZ L−1, which was obviously lower than that derived from other endpoints. In addition, a tiered ecological risk assessment was conducted in the Taizi River based on six PNECs derived from six categories of toxicity endpoints. Results of these two methods of ecological risk assessment were consistent with each other, and the risk level of ATZ to aquatic organisms reached highest as taking reproductive fitness into account. The joint probability indicated that severe ecological risk rooting in reproduction might exist 93.9% and 99.9% of surface water in the Taizi River, while 5% threshold (HC5) and 1% threshold (HC1) were set up to protect aquatic organisms, respectively. We hope the present work could provide valuable information to manage and control ATZ pollution.

Modeling of Water Quality Response to Land-use Patterns in Taizi River Basin Based on Partial Least Squares

Land use change in river basin is one of the most significant factors that influence river water quality. Based on remote sensing images and river water quality data of Taizi River Basin, partial least squares (PLS) model was applied to explore the relationship between water quality and land use patterns at sub-watershed scale. In this study, PLS model was established by using the percentage of area of land use patterns from seven different sub-watersheds as the variables and the concentrations of four water quality parameters as the observations. The established model was further tested with the data from other sub-watersheds in Taizi River Basin. The results indicated that total nitrogen (TN) and nitrate (NO3-) were significantly associated with land use types in Taizi River Basin with determination coefficient (R2) greater than 0.62. As for chloride (Cl-) and sulfate (SO42-), measured values and fitted values had a relatively low fitting precision (R2<0.5), which meant land use pattern was not the main factor affecting the concentrations of Cl-and SO42- in river water. Meanwhile, river water quality had a strong correlation with the percentage of area of unused land at the sub-basin scale (influence coefficient>0.24), although unused land area in the Taizi river basin was small.

太子河流域鱼类功能群结构与多样性对土地利用类型的响应

太子河流域鱼类功能群结构与多样性对土地利用类型的响应

UV-Visible Spectra Properties of DOM from Taizi River in Benxi City Section by Multivariable Analysis

This study investigated the ability of ultra violet-visible (UV-Visible) spectroscopy to analyze the origin,compositions,structure and humification level of dissolved organic matter(DOM). Seven surface water samples were collected from the Benxi City section of mainstream in Taizi River. Nine indices (SUVA254, E2/E3, E2/E4, E4/E6, S275-295, S350-400, A2/A1, A3/A1 and A3/A2), deduced from elemental analysis and UV visible spectroscopy of DOM, were used to assess the humification degree. The results showed that the characteristics of DOM were distributed along urban river and industrial wastewater discharge, and the DOM of waste water from Benxi steel plant contained a low degree of condensation of small organic molecules. E2/E3 showed positive correlation with E2/E4, and negative correlations with S275-295, S350-400, A2/A1,indicating that humification degree of DOM was not only concerned with the degree of condensation of organic molecules, but also closely associated with the ratio between humic acid and fulvic acid. Composition structure of DOM showed significant positive correlations with A2/A1, SUVA254 and S275-295, and significant negative correlations with E2/E3 and E2/E4. Based on the loadings of DOM component and scores plot of sampling sites in Taizi River (Benxi City section),the characteristics of DOM were distinctly distributed along urban river and industrial wastewater discharge, proving that the river was deeply influenced by human activity.

Minimum sampling area for the monitoring of herb diversity in riparian zone of temperate rivers, China

AbstractOptimal sampling area for biodiversity monitoring is a classical scientific topic for the biodiversity research in view of the cost, human resources and ecological significance. However, how much sampling area is enough for biodiversity monitoring in riparian area, the ecotone among freshwater and terrestrial system? Whether the optimal sampling areas are different among ecoregions? To explore these scientific questions, the minimum sampling area of riparian herbs was studied in Taizi river, Liaoning province, China. The species‐area relationship was modeled using average species richness in the same area (2.25, 4.5, 6.75 and 9 m2) of 55 sites distributed along riparian zone of Taizi river water course. The power model S = aAb modeled best, and was selected to fit species‐area curves. The minimum sampling areas for total species and dominant families were calculated via the selected model and corresponding estimated species richness. Results showed that the minimum sampling areas (MSAs) for herbs diversity monitoring in whole basin, highland ecoregion, midland ecoregion and lowland ecoregion of Taizi river were 12.82, 12.06, 13.46 and 13.08 m2,respectively. The MSAs of dominant families Compositae species and Graminale species were similar to that of total species. The minimum sampling area of Taizi river riparian zone was similar to other temperate riparian grassland and wet grassland, larger than dry grassland and salt meadow. So we did not need consider ecoregion difference for temperate riparian herbs diversity monitoring in watershed scale.

Hydrochemical zoning: natural and anthropogenic origins of the major elements in the surface water of Taizi River Basin, Northeast China

Discriminating the hydrochemical origins in the polluted rivers is a challenge work due to multiple sources contributing to the river’s chemical composition. The Taizi River, as an important tributary of the Liao River, in Northeast China, is flowing through an urban-, industry-, and agriculture-intensive area, and its hydrochemistry has been disturbed by human activities especially in the lower basin. In this study, an extensive analysis has been conducted to evaluate the natural and anthropogenic origins of the hydrochemistry in the Taizi River Basin. Three hydrochemical zones are determined based on hydrological connectivity, land use types and lithology, and the hydrochemistry pattern has changed from Ca-HCO3 type to Ca-HCO3-SO4 type from the upper basin to the lower basin due to increasing areas of agriculture and residence land. Six end members including the rain inputs, sewage discharge, mine drainage, carbonate, silicate and evaporate weathering are discriminated in the study area by applying a two stage stoichiometric method. The first stage is used to separate the anthropogenic inputs (sewage discharge and mine drainage) by an inversion technique, and the second stage is evaluating the rock weathering contributions from carbonates, silicates and evaporates by a forward method. Chemical budget calculation shows that carbonate weathering and anthropogenic inputs are two important factors controlling the hydrochemistry with contributions of about 52 and 27 % of the TDS, respectively. In addition, the contribution of anthropogenic inputs increases from 20 % in the upper basin to 30 % in the lower basin.

Assessment of the Huntai River in China using a multimetric index based on fish and macroinvertebrate assemblages

Recently, the concurrent use of multiple taxonomic groups in stream bioassessment is becoming increasingly common because the responses of each group to anthropogenic stressors may be different. In this study, a multimetric index based on fish and macroinvertebrate assemblages for the Huntai River basin (MMIHT) was developed using a dataset covering 54 sampling sites in order to assess ecosystem health. An index of land use, water, and habitat quality (ILWHQ) was calculated to evaluate the environmental quality at the studied sites. The five least deteriorated sites (ILWHQ < 2; T13, T15, T16, T17, and T18) were selected as the reference sites. Seven of an initial 68 candidate metrics were selected using a stepwise procedure that evaluated metric stability, responsiveness to environmental variables, and redundancy. The selected metrics included number of Cyprinidae species, the proportion of individuals as benthic species, the proportion of omnivore species, the proportion of individuals as tolerant species, the proportion of demersal egg species, number of EPT (Ephemeroptera, Plectopera, and Trichoptera) taxa, and the proportion of clingers. The ration scoring method was used to score the seven metrics and four classes were defined to describe the ecosystem health of the Huntai River basin. The findings that the final multimetric index was negatively correlated with the ILWHQ and successfully differentiated reference from impaired condition indicated that the index should be useful for evaluating river conditions. According to the results, more than half of the sites (57.4%) were classified as poor or very poor. The ecosystem health in the Taizi River was better than that in the Hun River. Furthermore, testing with additional data is needed to assess the suitability and robustness of the index.

Waste water treatment and pollution control in the Liao River Basin

Rapid economic development and population growth inChina go hand-in-hand with increasing urbanisation, in-volving growing mega-cities, industrialization, and inten-sified agriculture. As a result, natural resources areincreasingly stressed and productive management strate-gies towards sustainable planning are urgently needed.Pollution containing hazardous substances for environ-mental and human health, depletion of water resources as aresult of overexploitation, soil degradation and air pollutionin mega-cities (such as Beijing or Shanghai) are increasingat an alarming rate. Consequently, the protection of aquaticecosystems and the security of drinking water provision arebecoming an increasing challenge in water management.The Chinese government recognized the importance andcomplexity of the situation and has initiated a programentitled ‘‘Major Program of Science and Technology forWater Pollution and Governance’’ (2006–2020) (MajorWater Program). While shortages resulting from regionalresource depletion have led to plans for large-scale watertransport from distant water-rich areas of China (WaterDiversion Project), the water quality problems in otherareas require efficient, flexible, and site-specific solutionsand overall management concepts. China is internationallycooperating with many countries to tackle the severeenvironmental problems and learning from their experi-ences. In particular, China can benefit from the lessonslearnt in Germany concerning the rehabilitation of waterresources in areas heavily affected by chemical industryand mining after the reunification in 1989. German–Chi-nese cooperation in water sciences started over 25 yearsago and is dealing now with increasing challenges in the21st century (Chen et al. 2015). Under the umbrella of‘‘International Partnerships for Sustainable Technologiesand Services for Climate Protection and the Environment’’(CLIENT) under the ‘‘Research for Sustainable Develop-ment’’ framework programme the Federal Ministry ofEducation and Research of Germany (BMBF) started aseries of research projects supporting the Chinese MajorWater Program in several regions, the lakes, Taihu, Chaohuand Dianchi, as well as the Liao River Basin (Fig. 1).The Liao River Basin is located in northeast China withtwo river systems, one system is the Liao River formed byconverging Xiliao River and Dongliao River, and the othersystem is the Daliao River formed by converging HunRiver and Taizi River (Fig. 1). The province of Liaoningderived its name from the river. Shenyang is the provincialcapital of Liaoning. Liaoning was one of the first provincesin China to industrialize and heavy industry led to severeenvironmental pollution including the water environment.Liaoning has the largest economy of Northeast Chinacovering a wide range of industries, such as metallurgy,petroleum, chemical industries, pulp and paper making,pharmaceutical industry, printing and dyeing, machinery,electronics, metal refining, construction materials, ore andcoal mining, etc. The Liaohe-Songhuajiang River Basinbelongs to the priority areas of the Chinese Major WaterProgram. The Chinese central government launched a‘‘Revitalizing Northeast China and Other Old IndustrialBases’’ campaign (2005, http://www.china.org.cn/e-news/

Application of positive matrix factorization to source apportionment of surface water quality of the Daliao River basin, northeast China

Surface water monitoring networks play an important role in the stream water quality management. Since a time series of data is obtained from the monitoring network, multivariate statistical techniques can be used to identify important factors or pollution sources of water system. Positive matrix factorization (PMF) is an improved factor analysis tool that has had limited application to water systems. The objective was to apply PMF to monitoring data to apportion water pollution sources in the Daliao River (DLR) basin. The DLR basin includes the Hun and Taizi River catchments in northeast China. This basin is densely populated and heavily industrialized. Fourteen monitoring stations located on the two rivers were used for monitoring 13 physical and chemical parameters from 1990 to 2002. Results show that five sources/processes in the Hun River and four in the Taizi River were identified by marker species and spatial-temporal variations of resolved factors, including point and nonpoint sources for both rivers. In addition, the industrial pollution source emission inventory data were used to compare with the resolved industrial sources. Results reveal that chemical transformations have influenced some chemical species. However, this influence is small compared with observed seasonal variations. Therefore, identification of pollution point and nonpoint sources by their seasonal variations is possible, which will also aid in water quality management. The spatial variation of the industrial pollutants typically corresponded with the urban industrial pollution source inventories.

Differences in stream fish assemblages subjected to different levels of anthropogenic pressure in the Taizi River catchment, China

This study was conducted in the Taizi River catchment, located in northeastern China. Six representative streams in three regions (upper mountains, middle hills, lower plains) with different levels of anthropogenic disturbances were surveyed to describe the structure of fish assemblages and their relationship to environmental parameters. The results showed that the fish assemblages were significantly different among the three regions in the Taizi River catchment. Indicator species analysis found ten representative fish species in the Taizi River catchment and four species in the upper, four species in the middle, and two species in the lower regions. The ecological traits of the representative fish species were generally in agreement with the physiochemical features of the streams located within different regions. Multivariate analysis indicated that altitude, water temperature, and total nitrogen were the three most significant environmental parameters influencing the fish assemblage structure in the Taizi River catchment. Based on the different environmental features and fish assemblages found in each region, fish management and conservation strategies should be tailored to the specific characteristics of each region.

鱼类生物群落对太子河流域土地利用、河岸带栖息地质量的响应

PDF HTML阅读 XML下载 导出引用 引用提醒 鱼类生物群落对太子河流域土地利用、河岸带栖息地质量的响应 DOI: 10.5846/stxb201401140106 作者: 作者单位: 中国环境科学研究院,中国环境科学研究院,中国环境科学研究院,中国环境科学研究院,中国环境科学研究院 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(41401066);国家水体污染控制与治理科技重大专项(2012ZX07501-001-04);中欧环境可持续发展计划(DCI-ASIE/2013/323-261) Exploring the relationship among land-use, riparian habitat quality, and biological integrity of a fish community Author: Affiliation: Chinese research academy of environmental sciences,Chinese Research Acaemy of Environmental Sciences,Chinese Research Academy of Environmental Sciences,, 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:河流生态系统的退化是多空间尺度环境因子作用的结果。探讨不同尺度环境因子及水生生物之间的作用关系,识别影响水生生物群落完整性的尺度问题,是有效开展水生生物保护的基础。基于2009年对太子河流域15个样点的鱼类、河岸带栖息地质量评价,结合遥感影像解译的太子河流域土地利用情况(包括流域尺度和河段尺度),研究鱼类完整性指数(F-IBI)与两种尺度土地利用、栖息地质量参数之间的关系。结果表明太子河上游地区河岸栖息地质量较好,下游地区由于农业用地、城镇用地比例的增加河岸栖息地质量明显下降。F-IBI与自然用地比例呈正相关,与农业、城镇用地比例呈负相关。农业用地对F-IBI的影响体现在流域尺度,而城镇用地在两种尺度上都存在显著影响。相比于农业用地,城镇用地相同比例的增加会导致F-IBI更快的下降。底质、水质状况、人类活动强度是显著影响F-IBI的栖息地质量评价参数。3项参数均随农业和城镇用地比例增加而降低,农业用地主要在流域尺度上对3项参数产生影响,城镇用地主要影响底质和水质状况2项参数,而在两种尺度上的影响相差不大。 Abstract:River ecosystems are being degraded by various environmental factors across multi-spatial scales. In general, aquatic organism conservation aims to explore the relationship between aquatic organisms and environmental factors across multi-spatial scales, and to discern the scale at which the biological integrity of aquatic organisms is affected. We collected data about fishes and riparian habitat conditions at 15 sampling sites in the Taizi River basin during August, 2009. In parallel, we collected data on land use at the both of catchment and reach scales by interpreting the satellite images. We explored the relationship among the fish index of biotic integrity (F-IBI), land use at two scales, and riparian habitat condition. The results showed that riparian habitat condition is relatively better in the upper regions than the lower regions of rivers, due to a percentage increase in farmland and urban areas in the lower regions. F-IBI showed a positive correlation with the proportions of natural areas, but showed a negative correlation with the proportions of farmland and urban areas. F-IBI exhibited a stronger response to the proportion of farmland at the catchment scale, and to the proportion of urban areas at both scales. Compared to farmland, the same percentage increase in urban area resulted in a faster decrease of F-IBI. Substrate, water quality, and anthropogenic disturbances were three key riparian habitat parameters that significantly degraded F-IBI. These three parameters decreased with increasing proportions of farmland and urban areas. Farmland showed a significant effect on the three parameters at the catchment scale, whereas urban areas only significantly affected substrate and water quality at both scales. 参考文献 相似文献 引证文献

Investigation of Phytoplankton and Evaluation on Water Quality of Taizi River in Liaoyang Area

To evaluate water quality, an investigation of phytoplankton community was conducted in Taizi River of Liaoyang Area, June 2011. The results showed that 130 species of phytoplankton belong to 6 phyla and 63 genera existed. Chlorphyta has the richest species of algae, which accounted for 43.85% of the total number, followed by Bacillariophyta (32.41%). Water quality in upstream is better than downstream. Species and biomass of Cyanophyta and Euglenophyta which have tolerance of pollution increasing According to the integrative analysis result of Shannon-Wiener diversity index, Pielou Evenness index and Margalef Species diversity index, Taizi river is judged belong to low-polluted or oligo- polluted，but some sites belong to β -moderate polluted, effective managements should be taken in order to control the water pollution.

Relating metal bioavailability to risk assessment for aquatic species: Daliao River watershed, China

The spatial distribution of metal bioavailability (Ni, Cu, Zn, and Pb) was first evaluated within the waters of Daliao River watershed, using the diffusive gradient in thin films (DGT) and chemical equilibrium models. To assess potential risks associated with metal bioavailability, site-specific 95% protection levels (HC5), risk characterizations ratios (RCR) and ratios of DGT-labile/HC5 were derived, using species sensitivity distribution (SSD). The highest bioavailability values for metals were recorded in the main channel of the Daliao River, followed by the Taizi River. Dynamic concentrations predicted by WHAM 7.0 and NICA-Donnan for Cu and Zn agreed well with DGT results. The estuary of the Daliao River was found to have the highest risks related to Ni, Cu, and Zn. The number of sites at risk increased when considering the total toxicity of Ni, Cu, and Zn.

Relationships between land use patterns and water quality in the Taizi River basin, China

Using land use types and landscape metrics, as well as statistical and spatial analysis, we determined the relationships between land use patterns and river water quality in the Taizi River basin, China, during dry and rainy seasons in 2009. Correlation and multiple linear regressions indicated that vegetated areas had a positive contribution to river water quality and predicted total nitrogen during the rainy season. Built-up land use strongly influenced nitrogen and phosphorus parameters in river water. Agricultural land use was associated with most physicochemical variables and nitrogen during the rainy season. Landscape metrics during both seasons were significantly associated with river water quality. Shannon's diversity index was the primary predictor for chloride and ammoniacal nitrogen. Mean Euclidean nearest neighbor index defined ammoniacal nitrogen, orthophosphate, and total phosphorus during the dry season. Biological oxygen demand and permanganate index were expressed by Contagion during the rainy season. Factor analysis indicated that the river suffered organic, phosphorus, and nitrogen pollution and a zone dominated by agricultural and built-up land uses in the river basin tended to have worse water quality than other areas. The results provide a useful approach that uses landscape patterns to estimate water quality in rivers for water pollution control and land use management.

Spatial and temporal distribution of polycyclic aromatic hydrocarbons (PAHs) in surface water from Liaohe River Basin, northeast China

Liaohe River Basin is an important region in northeast China, which consists of several main rivers including Liao River, Taizi river, Daliao River, and Hun River. As a highly industrialized region, the basin receives dense waste discharges, causing severe environmental problems. In this study, the spatial and temporal distribution of aqueous polycyclic aromatic hydrocarbons (PAHs) in Liaohe River Basin from 50 sampling sites in both dry (May) and level (October) periods in 2012 was investigated. Sixteen USEPA priority PAHs were quantified by gas chromatography/mass selective detector. The total PAH concentration ranged from 111.8 to 2,931.6 ng/L in the dry period and from 94.8 to 2766.0 ng/L in the level period, respectively. As for the spatial distribution, the mean concentration of PAHs followed the order of Taizi River > Daliao River > Hun River > Liao River, showing higher concentrations close to large cities with dense industries. The composition and possible sources of PAHs in the water samples were also determined. The fractions of low molecular weight PAHs ranged from 58.2 to 93.3 %, indicating the influence of low or moderate temperature combustion process. Diagnostic ratios, principal component analysis, and hierarchical cluster analysis were used to study the possible source categories in the study area, and consistent results were obtained from different techniques, that PAHs in water samples mainly originated from complex sources, i.e., both pyrogenic and petrogenic sources. The benzo[a]pyrene equivalents (EBaP) characterizing the ecological risk of PAHs to the aquatic environment suggested that PAHs in Liaohe River Basin had already caused environmental health risks.

Seasonal Variations of the Regular Indices of the Surface Water in the Taizi River

The regular indices of the surface water of the Taizi River, Liaoning Province, northeast of China, were investigated. Samples were collected from upstream to downstream locations of the mainstream, and also from the tributaries of the Taizi River in dry season, wet season, and normal season, respectively. The DO values of the surface water ranged from 3.35 mg/L to 18.73 mg/L, 0.09 mg/L to 13.44mg/L, and 3.49 mg/L to 16.9 mg/L, respectively, in the dry season, wet season, and normal season, respectively. The seasonal variations of the pH values of the surface water were in the order of dry season &gt;wet season &gt;normal season.

Spatial and seasonal characteristics of river water chemistry in the Taizi River in Northeast China

Anthropogenic activities have led to water quality deterioration in many parts of the world, especially in Northeast China. The current work investigated the spatiotemporal variations of water quality in the Taizi River by multivariate statistical analysis of data from the 67 sampling sites in the mainstream and major tributaries of the river during dry and rainy seasons. One-way analysis of variance indicated that the 20 measured variables (except pH, 5-day biological oxygen demand, permanganate index, and chloride, orthophosphate, and total phosphorus concentrations) showed significant seasonal (p ≤ 0.05) and spatial (p < 0.05) variations among the mainstream and major tributaries of the river. Hierarchical cluster analysis of data from the different seasons classified the mainstream and tributaries of the river into three clusters, namely, less, moderately, and highly polluted clusters. Factor analysis extracted five factors from data in the different seasons, which accounted for the high percentage of the total variance and reflected the integrated characteristics of water chemistry, organic pollution, phosphorous pollution, denitrification effect, and nitrogen pollution. The results indicate that river pollution in Northeast China was mainly from natural and/or anthropogenic sources, e.g., rainfall, domestic wastewater, agricultural runoff, and industrial discharge.

Are Diatom-based Indices from Europe Suitable for River Health assessment in China? A Case Study from Taizi River, Northeastern China

Aims :Diatom-based indices are widely used for river health assessment. Many such indices were originally developed in European countries based on a specific taxa list of benthic diatoms. Thus, the transferabil ity of these indices to other rivers and geographic locations has been questioned. Design,Place and Duration of Study:In this study, we sampled benthic diatoms in the

在种与属两个级别评价太子河硅藻群落与环境因子的关系

PDF HTML阅读 XML下载 导出引用 引用提醒 在种与属两个级别评价太子河硅藻群落与环境因子的关系 DOI: 10.5846/stxb201310282593 作者: 作者单位: 大连海洋大学,大连海洋大学,大连海洋大学,中国环境科学研究院,中国环境科学研究院 作者简介: 通讯作者: 中图分类号: 基金项目: 国家"水体污染控制与治理"重大科技专项,流域水生态保护目标制定技术研究课题(2012ZX07501-001);国家自然科学基金(51079123) Evaluation of relationship between environmental factors and diatom assemblages at genus and species levels in the Taizi River Basin, China Author: Affiliation: Dalian Ocean University,,College of Fisheries and Life Science, Dalian Ocean University,, 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:2009年8-9月,对辽宁省太子河流域67个点位进行采样调查,以硅藻群落为研究对象,比较硅藻属级水平与种级水平相对多度、物种丰富度以及生物多样性指数间的相关性,并比较硅藻属级与种级属性与环境因子的相关性.实验结果表明,太子河流域硅藻属级水平的相对多度、丰富度和多样性指数与硅藻种级水平都极显著相关.Pearson相关性分析表明,硅藻属级水平的丰富度与环境显著相关的因子与种级水平丰富度与环境显著相关的因子相一致.Mantel-Test相关性分析表明,硅藻属级水平的相对多度与环境因子的相关性弱于种级水平与环境因子相关性.典范对应分析结果显示,影响硅藻属级和种级群落结构分布的主要环境因子均为悬浮物.基于硅藻生物评价指数的流域健康评价结果表明,应用硅藻属级和种级属性对太子河流域进行健康评价,其评价结果相一致. Abstract:Benthic diatoms are generally used to assess stream conditions, however most of the methods and diatom indices are based on the identification at species levels, which requires a lot of training because of its extreme diversity. Compared with species level, identification at genus level can save amount of time and money to assess river pollution, however it may lose some ecological information. In this paper, we investigated 67 samples sites in the Taizi River basin to investigate the relationship between diatom assemblages and environmental characteristics at both species and genus levels. Ten diatom assemblage attributes: relative abundance, richness, Shannon-Wiener diversity index, Pielou diversity index, Margalef diversity index, Berger-Parker diversity index, Simpson diversity index, Hill diversity index and Mackintosh diversity index were chosen to evaluate concordance correlations between genus and species level. We assessed relationship between diatom assemblages and environment base on the Pearson Correlation Test, Mantel-Test, Canonical Correspondence Analysis and Diatom Bioassessment Index. The results showed that 15 genera and 141 species of diatoms were observed in the Taizi River basin. The most abundant species was Navicula, followed by Nitzschia, presenting 32.6% and 13.5% of the sample sites, respectively. The Diploneis and Stauroneis were represented by a single species. Genus richness ranged from 2 to 13 and the species richness ranged from 3 to 40. The relative abundance and richness had strong correlations between species and genus resolution. Eight biology diversity indexes had strong correlations between species and genus resolution, of which the strongest coefficient was Mackintosh diversity index. Moreover the Berger-Parke diversity index was no related with the other biology diversity indexes. Both genus and species richness exhibited strong correlations with the suspended solid, total dissolved solid, total nitrogen, Cl-, NH4+-N, PO43-, sand, total phosphorus, biochemical oxygen demand, chemical oxygen demand and permanganate index. Dissolved oxygen and NO3--N variables were significantly correlated with genus richness, however there were no significant correlation between species richness and dissolved oxygen or NO3--N. Correlations between major-ions, nutrients and organic matter with species relative abundance were significant, which was also observed at genus level. Based on principal component analysis, dissolved oxygen, conductivity, suspended solid, NO2--N and biochemical oxygen demand were the main environmental factors in Taizi River basin. Canonical correspondence analysis showed that suspended solid had significant influence on the community structure of genus and species diatom in Taizi River basin. Assessment of river condition was made using the Diatom Bioassessment Index (DBI) at species and genus levels. The results at both levels (species and genus) showed same trend, indicating that upstream area of Taizi River basin was in excellent and good ecological integrity, while the stream condition of downstream area was in severe pollution. In conclusion, genus resolution may be used to replace the species resolution to evaluate the river conditions in China. 参考文献 相似文献 引证文献

Study on the Contamination of NH&lt;sub&gt;3&lt;/sub&gt;-N and Total Phosphorus in the Seasonal River

Water samples were collected from the upstream to the downstream of a seasonal river, the Taizi River, and its main tributaries in dry season, normal season, and wet season. The variations of NH3-N, and total phosphorus (TP) within a hydrological year were analyzed, aimed to study the pollution characteristics and sources of the water bodies. It was found that the tributaries of the Taizi River were heavily contaminated by NH3-N, with 83.8%, 100% and 100% of the sampling sites exceeding the fifth level in the dry season, wet season and normal season, respectively. The concentration of TP in the dry season fluctuated wildly, which was much higher than those in the wet and normal season. Compared with the permissible levels set by the environmental quality standards for surface water standard (GB3838-2002) of China, 57.1% of the sampling sites in the main stream and tributaries of the Taizi River belong to the fifth level or exceed the fifth level in the dry season, and only 7.1% of the sampling sites were belonging to the fifth level or exceed the fifth level in the wet and normal season. Overall, the waterbody of Taizi River was more seriously polluted by urban domestic sewage and point source of industrial wastewater.