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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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黄土台塬区土地利用转移流及空间集聚特征分析
DOI: 10.11821/xb201302010, PP. 257-267
Keywords: 土地变化科学,土地系统,土地转移流,空间集聚特征,黄土台塬区
Abstract:
提出了土地利用转移流和土地利用活跃度的概念,基于Landsat遥感影像数据,采用土地利用变化测度模型,以5年和25年两种时间尺度对黄土台塬区土地利用时空动态特征进行分析,并将密度制图法应用到土地利用变化的空间集聚特征识别中.研究表明①黄土台塬区耕地占绝对优势,后备耕地资源严重不足,林地、草地、水域比例较低,存在较大生态风险;②耕地与建设用地、草地、林地之间的转移关系是黄土台塬区土地利用转移的关键关系,决定着台塬区土地利用变化特征;③1985-2010年耕地转建设用地流高达26668.80hm2,占土地转移流40.75%,草地转耕地流18923.90hm2,占28.91%,建设占用耕地情况严重,耕地占补平衡主要通过挤占草地实现;④25年以来,土地利用变化对水域扰动最大,其次为森林,草地第三;⑤土地利用变化存在阶段性,1990-2000年土地利用变化速率高于其他时段;⑥不同时间尺度下土地利用变化的空间集聚特征不同,25年尺度下城镇附近土地变化幅度较高,5年尺度下土地利用变化热点区由台塬中部向东西边缘区推移.
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