| "Fourteenth Five-Year Plan" emphasizes the importance of continuous improvement of water ecological environment,and puts forward a new idea of "three rivers" coordination,which takes water ecological environment quality as the core,pollution reduction and ecological capacity expansion as two efforts,and makes overall plans for water resources utilization,water ecological protection and water environment governance.As a tributary of Songhua River,Ashi River is located in the eastern part of Northeast China.The health status of the Ashi River Basin is seriously affected by the seasons.Low temperature and low flow have a significant impact on the water resources,water environment and water ecology of the Ashi River Basin in winter.Based on the overall planning of "Three Rivers" and the idea of "basin planning and regional implementation",this study carried out the research on the spatial and temporal evaluation and control strategy of water ecological function zoning in the Ashi River Basin,which is conducive to providing scientific and technological support for the fine intelligent operation and maintenance model of environmental governance in cold regions.In environmental regulation,the application of new watershed biomonotoring methods is conducive to more rapid,efficient and comprehensive monitoring of watershed water ecological changes,so as to provide reference for better understanding of watershed water ecological heterogeneity.In 2018,the European Water Framework Directive(Wed)assessed the "elements of biological quality" and incorporated DNA identification indicators into the implementation of the ecological status assessment.This paper based on the macro DNA barcode technology to ASHLEY river basin level period stage,mixed,frozen period,unsealed samples,the research watershed in eukaryotic microbial community distribution and diversity,the ash river basin in cold environment eukaryotic microbial community were determined,and the determination of the physical and chemical factors of water quality and analysis,The spatial and temporal heterogeneity of water ecology in the Ashi River Basin was revealed by studying the correlation between the distribution pattern of eukaryotic microbiota and environmental factors.Secondly,based on the idea of "overall planning of three rivers",the water ecological quality evaluation system was constructed from three aspects of water resources,water environment and water ecology.The combined method of entropy weight method and analytic hierarchy process was used to evaluate the health status of the Ashi River Basin under the cold environment.The research results show that the weights calculated by entropy weight method and analytic hierarchy process are different to some extent,but in general,the importance degree is water ecology > water environment > water resources.According to the health evaluation system of the Ashi River Basin,the comprehensive index of ecological health was calculated based on the entropy weight method and analytic hierarchy process.The following conclusions were drawn: the monitoring points S1 and S2 were in the state of health;The health status of monitoring site S3 was sub-health.Sampling points of S4 and S5 are in healthy state;The health status of monitoring site S6 is poor.The monitoring sites S7 and S8 were unhealthy.Finally,through to the ash river regional ecological zoning the condition of the research,combining the problems existing in the ecological control area demarcated,through the study of the son of ash river basin river basin,"bottom-up" achieve clustering sub basin,and combining with the current system of "river(lake)long" real watershed control system,such as the basin made plan to further refine management.Based on the SOM method,the 21 sub-basins were classified into three precise water ecological control regions of the Ashi River Basin.In order to manage the precise control area of water ecology in the Ashi River Basin more effectively,some control suggestions were put forward for each control area. |
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