Analysis of Pollution and Ecological Value Based on Changes of Land Types in the Reservoir Watershed
LIU Bing
FAN Yong
LI Qingfei
YU Guozhong
ZHAI Huimin
ZHANG Meng
Abstract：Based on remote sensing and GIS technology,the types of land around Nanwanhu Reservoir watershed in 1990-2012 were investigated.The results showed in the past 30 years,the types of land around the reservoir watershed had been significantly changed.Land of tea and arable land were gradually increased,and woodland,water,residential land and bare land area were decreased.Land of tea,urban rural land and arable land were positively correlated with water quality,and woodland and water quality indicators showed a negative correlation.The greatest impacting factor for water quality of the Reservoir was land of tea,and woodland could remove parts of the nitrogen,phosphorus,organic matter and improve water quality in the Reservoir.Total value of ecosystem services in the watershed was raised in 1990-2005,and declined in 2005-2012.Ecosystem services value of waters was the largest in the total value,accounting for 34.23％ and 67.31％.Total value of maintenance of biological diversity,maintenance of the soil,climate regulation and gas conditioning accounted for about 60％ of ecosystem services,and the value trends of maintenance of biological diversity,climate regulation and gas regulator were consistent with the overall value trend.
Keywords：Nanwanhu Reservoir watershedtype of land useanalytical sourcesecological valuenon-point source pollution
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 31-38 )