Quantification of the Impact of Land Use and Land Cover Changes upon Nitride Cycling Values in Karst Ecosystem: A Case Study in Northwest, Guangxi, China
- 作者：ZHANG MingyangWANG KelinCHEN HongsongZHANG Chua huaLIU Huiyu
- 会议时间：2009-10-20
- 关键词：karst ; northwest Guangxi ; China ; nitride cycling value ; land use and land cover
- 作者单位：ZHANG Mingyang,WANG Kelin,CHEN Hongsong,ZHANG Chua hua(Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture CAS Changsha 410125)LIU Huiyu(College of Geography Science, Nanjing Normal University,Nanjing 210024)
- 母体文献：2009 第八届ESRI中国用户大会论文集
- 会议名称：2009 第八届ESRI中国用户大会
- 会议地点：北京
- 主办单位：中国地理信息系统协会
- 语种：chi
摘要
Through the techniques of remote sensing (RS) and geographic information system (GIS),we analyzed the spatial distribution of NCV for the typical karst region in Northwest Guangxi,China in 1985,1990,2000 and 2005,using Landsat TM images,weather data and geographical data.Results showed that:NCV decreased firstly and then increased,but the NCV of 2005 was less than that of 1985.NCV were 33.08million Yuan,21.26 million Yuan,30.04 million Yuan and 31.33 million Yuan in 1985,1990,2000 and 2005respectively.Woodland and shrub were the two largest contributors to total NCV.The total ratios of them were 77.18%,76.15%,79.86% and 74.50% in the four years.While NCV of residential and barren rock were low,and the total ratios of them were only 0.60%,0.47%,0.47% and 0.77%.NCV declined from west to east,from mountain to peak-cluster depressionareas,and increased in typical karst areas,but distinctly decreased in non-karst areas.Our study indicates that ecosystem conditions are improving because of the application of rocky desertification control policies,such as ecological migration and returning farmland to forest.