Study On Water Ecosystem Evaluation And Water Ecology Civilization Construction In The Dawen River Valley

The water ecological system as an important part of the natural ecological system,not only provides basic resources of all kinds of production and life,but also is an important guarantee to promote the natural ecosystem balance of steady state and the relative balance.The Dawen River Basin in industrialization,science and technology,informationization,urbanization is developing rapidly,the magnitude of the river basin development and water resources utilization reached an unprecedented height,water ecosystem health and sustainable development face a severe test.This study aimes at Dawen river basin area,by using the combined method of survey and sampling data,Dawen river basin water ecological system is studied in phytoplankton,zooplankton,fish,the characteristics of the benthic animal community,to do the analysis from their community structure composition,space distribution and diversity characteristics.From water quality and aquatic fish and riparian zone of river basin ecological health to make a comprehensive evaluation,and on this basis,construct the target layer,criterion layer and index layer of tertiary basin comprehensive evaluation system.(1)This is used for the water quality analysis in the single factor index method,fuzzy mathematics method and the method of comprehensive pollution index method in three different evaluation,after the analysis of a kind of more suitable for the study of the method,the comprehensive pollution index method and watershed water quality results are obtained: the whole basin water quality is poorer,? class water accounts for 33.3% of the total sample point;V class water accounts for 29.2% of the total sample point;Bad V kind water accounted for 37.5% of the total sample point.Main exceeding pollutants are total nitrogen,total phosphorus and ammonia nitrogen.Main contaminated range in the hui river tributaries and the south tributary of Brunei river,and the tributaries near the intersection.(2)The aquatic organisms set fish as mainly analysis object,using WIMB and F-IBI method,contrast to select WIMB as standard,river fish integrity results are obtained: the whole river fish integrity is below average,better and more sampling points and the general standard sample point are accounted for 29.2% of the total sample point,poor and sampling points below 41.6%.(3)The river bank with analytic hierarchy process(ahp)is adopted to define the riparian zone: health within the scope of the sample point controlled,river riparian zone overall situation is good,there is no habitat conditions poor area.(4)The watershed ecosystem health results show that the basin system is given priority to with IV and V,only 8.3% of the sample point for level III health level.Poor overall health.The river regulation is imperative.(5)Based on the concept of sustainable development,our country put forward the "scientific development",emphasis on economic-social development should be appropriate to resource environment,go tp the sustainable development road.And in the eighteenth big ecological civilization construction into five general layout.With Dawen river basin water ecological system based on the evaluation results,analysis of the current water environment facing two major problems,put forward the measures of river basin management and recovery and construction of river basin security science and technology,so as to provide ideas for future river basin development.