泾河流域土地利用与生态承载力变化分析
首发时间:2010-03-31
摘要:本文基于生态足迹方法中的生态承载力模型,利用GIS和RS技术手段,研究了泾河流域1986~2008年土地利用类型结构以及基于流域和分县的生态承载力动态变化,结果表明:由于退耕还林还草政策的实施,泾河流域地区耕地面积总量及其比例在2000年之后急剧减小,林地和草地面积增大;流域生态承载力总量和各县生态承载力总量在2000年之后呈显著下降趋势,人均生态承载力逐年递减,耕地的减少是生态承载力总量变化的主要原因,生态承载力总量的减少和人口数量的增加进而导致人均生态承载力变化。
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Dynamic Change of Land Use and Ecological Carrying Capacity in Jinghe Watershed
Abstract:Based on the ecological carrying capacity model of ecological footprint methodology and with the help of GIS and RS, this paper figured out the dynamic change of land use and the ecological carrying capacity in Jinghe Watershed from 1986 to 2008, and analyzed the station of the ecological carrying capacity at the county scale. The results are shown as follows: due to the implementation of returning the farmland to foresty (grassland) policy, the area and its proportion of arable was obviously reduced after 2000, in contrast, the area of foresty and grassland were increased; the total ecological carrying capacity showed a significant downward trend after 2000 which were due to the reduction in arable, the per-capita ecological carrying capacity declined annually because both of the increasing in population and the decreasing in total ecological carrying capacity.
Keywords: Ecological carrying capacity Land use Jinghe Watershed
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No.4136652332412700****
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