Design Features Of The Fluvial Zoobenthos Community And Bio-assessment Of Water Quality In The Area Of The Southern Part Of Jiangsu Province

Zoobenthos refer to the aquatic group that live in the bottom of a water body and can be seen with naked eyes. They dominate a very important part in the aquatic ecosystem, with diverse species and wide distributions in all kinds of water bodies. They have long life cycle and relatively fixed living fields, therefore likely to be collected. Moreover, species vary widely in the sensitivity toward environment, which plays a significant role in the sustainment of the integrity of aquatic ecosystem. For this reason, assessing the quality of a water body through the analysis of environmental evaluation indexes such as the populative structure, dominant species and quantities of Zoobenthos has been widely used in water environment evaluation.I A study on the comparison of Zoobenthos field sampling methodsAccording to the study on the comparison, based on five representative sampling points, of the monitoring data from Zoobentos D-shape web and Perterson sampling respectively, D-shape web method prevails over Peterson sampling in the respects of total quantity, element numbers of general classification, Shannon—Wiener index, Margalef index, Pielou index ane BI index of the benthic macro-invertebrates collected, but there is still possibility that Peterson sampling performs better than D-shape web method under certain conditions. When we do field benthos sampling, we should put D-shape web method first and combine it with Peterson sediment sampler.ⅡDesign Features of the Macrobenthic communities and Bio-assessment of Water Quality in the Area of the Southern Part of Jiangsu Province.(1) 2008,The benthic macro-invertebrates collected from 26 sampling points in the southern Jiangsu belong to 5 kingdoms,10 classes and 127 species, including 8 species from Arthropoda:Crustacea,38 from Insecta:Diptera,12 from Odonata,5 from coleopteran,5 from ephemeroptera,2 from Lepidoptera,2 from Heteroptera,1 from trichoptera,16 from mollusc phylum:Lamellibranchia,14 from Gastropoda,7 from Oligochaeta:Annelida,2 from polychaeta,3 from hirudinean,11 from Nemathelminthes and 1 from flatworms. Through the species cluster analysis, the benthic macro-invertebrates in the southern Jiangsu can be divided into different systems such as Changjiang Estuary Major River System, Stream System, plain reservoir, Lake-pool-river Web System and so on, with the first two having characteristic species of their flora type.(2) 2008,Each position in the southern Jiangsu has 3～44 species of general classified element numbers, with biological density of 22.530816 ind/m2, Shannon—Wiener index of 0.58～4.54, BI index of 3.92-9.00, Margalef index of 0.19～9.04, and Pielou index of 0.38～1.21. More than 60% of all positions are moderately or seriously polluted, which are mainly focused on the Lake-pool-river web in the eastern part of MaoShan Mountain where the pollution is severe on the whole. While the 4 profiles of the western MaoShan Mountain are positioned on or below the rank of mild pollution, where the pollution is mild on the whole. According to the biological effects of pollution among the benthic macro-invertebrates, the condition of Qinghuai water system is better than that of Taihu Basin since the monitoring points in the former area all belong to or are below the rank of mild pollution effect while for the Taihu Basin, the eastern part has received relatively mild pollution, ranking to the none-slight pollution effect; streams and reservoirs take the second place, where the condition belongs to the rank of slight-moderate pollution effect; Changjing River takes the third place, ranking as moderate pollution effect; and the rest part as the lake-pool-river web faces the worst situation in which the pollution effect is beyond the serious level.