任宗萍,杨勤科,胡志瑞,刘建飞.基于项目驱动的藉河流域土地利用时空变化动态分析[J].干旱地区农业研究,2009,27(3):239~244
基于项目驱动的藉河流域土地利用时空变化动态分析
Analysis of project-induced temporal-spatial land use change in Jihe River watershed
  
DOI：10.7606/j.issn.1000-7601.2009.03.44
中文关键词:  土地利用  动态变化  空间变化  藉河流域
英文关键词:land use  dynamic change  spatial change  Jihe River watershed
基金项目:黄委会天水水土保持实验站项目“黄土丘陵三副区水土流失预测预报的区域模型研究”； 国家重点基础研究发展计划(973计划)项目资助“区域水土流失过程与趋势分析”(2007CB407203)
作者单位
任宗萍 College of Resources and Environment Northwest A＆F University， Yangling， Shaanxi 712100， China；Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources， Yangling， Shaanxi 712100， China 
杨勤科 College of Resources and Environment Northwest A＆F University， Yangling， Shaanxi 712100， China；Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources， Yangling， Shaanxi 712100， China 
胡志瑞 College of Resources and Environment Northwest A＆F University， Yangling， Shaanxi 712100， China；Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources， Yangling， Shaanxi 712100， China 
刘建飞 College of Resources and Environment Northwest A＆F University， Yangling， Shaanxi 712100， China；Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources， Yangling， Shaanxi 712100， China 
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中文摘要:
      根据1997年、2001年和2005年三期TM影像资料,运用遥感非监督分类的方法提取土地利用信息。利用地理信息系统空间分析和数据统计的方法,分析藉河流域1997~2005年间土地利用数量变化和空间变化特征,研究该地区主要土地利用类型数量变化、空间变化以及在不同坡度的动态变化特征。结果表明:耕地、林地和草地三种主要土地利用类型占该研究区土地利用面积的97%以上,是该研究区主要的土地利用类型。以1997年为基数,到2001年和2005年耕地减少幅度分别为1.2%和11.1%,因此1997~2001年的退耕程度小于2001~2005年;在不同坡度上,土地利用变化主要发生在5°~40°,而且在15°~25°之间变化最大。
英文摘要:
      Based on three sets of TM data (1997, 2002 and 2005) , the land use information was extracted by the method of unsupervised classification.Using the tools of geographical information system (GIS) combined with statistics, this paper analyzed the quantitative change and the spatial change of the land use types, and also the dynamic change of land use on different slopes.The results are as follows: cultivated land, forest and grassland accounted for more than 97%, which were the main land use types of the study area.Compared to 1997, cultivated land decreased 1.2% in 2001 and decreased 11.1% continuously in 2005.The conversion of cropland to forest and grassland during the period from 2001 to 2005 was higher than that in the period from 1997 to 2001.In different slope gradients, the land use change mainly happened on the slope from 5° to 40°, and the greatest change were on the slope from 15° to 25°.
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