Evaluation Of Ecological Environment Quality In Danjiangkou Water Source Area Based On RS And GIS In Hubei Province

The Danjiangkou water source area in Hubei Province has an important geographical location.It is the core water source of the Middle Route Project of the South-to-North Water Transfer Project.It is the key drinking water source protection area in the Jianghan Plain.It is the key water and soil conservation area in the upper reaches of the Yangtze River and is the key area for the national ecological environment construction.The quality of its ecological environment has an important impact on the economic and social sustainable development of the surrounding areas of the reservoir area.It is the basis for the harmonious coexistence of economic construction and ecological environment.It is the premise for ensuring the eastward flow of “one reservoir clear water” and the development of soil and water conservation for the upper reaches of the Yangtze River.The scientific basis for planning.This paper takes the Danjiangkou water source area in Hubei Province as the research object,and builds the Danjiangkou water source area in Hubei Province based on the ecological environment assessment method in the Technical Specifications for Ecological Environment(HJ192-2015)(hereinafter referred to as “2015-Technical Specifications”).The eco-environment quality evaluation index system evaluates the ecological environment quality of the study area from1998 to 2017,conducts an in-depth analysis of the changes in the regional eco-environmental quality,and briefly analyzes the imaging factors.The main conclusions of the paper are as follows:(1)Based on the research results of ecological environment assessment in the Danjiangkou water source area,based on the ecological function characteristics of the study area,an ecological environment quality evaluation index system based on two major categories of ecological status indicators and environmental status indicators was constructed.(2)In the past 20 years,the ecological status index of Danjiangkou water source area inHubei Province was between 36.99 and 42.85,and the environmental status index was between 75.18 and 83.39.During the study period,Zhangwan District had the highest ecological status index,and Luxi County The ecological status indicator has the lowest score.(3)In 1998-2002 and 2014-2017,the ecological environment quality became the best in the two time periods,and the ecological environment quality tends to be better;2002-2006 and 2010-2014 no obvious The proportion of change is the largest,and the quality of ecological environment tends to be stable;from 2006 to 2010,the proportion of deterioration is the largest,and the quality of ecological environment is degraded.(4)From the fluctuation of ecological environment quality in Danjiangkou water source area of Hubei Province,the fluctuations in 2014-2017 were the most obvious,and 90.41%fluctuated.Among them,25.08% had large fluctuations,and 65.33% had slight fluctuations.In the whole region;9.50% tend to be stable,distributed in Zhangwan District and Maojian District;from 2002 to 2006,the fluctuations were the weakest,with 43.47% fluctuating,of which 4.69% fluctuated greatly and 38.78% were slightly fluctuating.It is mainly distributed in the northwest and south of the study area;56.52% tends to be stable,mainly distributed in Danjiangkou City,Yuyang District.