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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (32): 237-242.

所属专题： 耕地保护

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

青海湖流域土地沙漠化敏感性评价

赵明月 赵文武 靳婷 安艺明 徐海亮   

  • 收稿日期:2012-04-01 修回日期:2012-06-14 出版日期:2012-11-15 发布日期:2012-11-15
  • 基金资助:

    青海湖流域生态和环境治理技术集成与试验示范;长江学者和创新团队发展计划“土壤水文与土壤侵蚀”

Land Desertification Sensitivity Evaluation in Qinghai Lake Basin

  • Received:2012-04-01 Revised:2012-06-14 Online:2012-11-15 Published:2012-11-15

PDF (PC)

637

摘要：

为了明确青海湖流域土地沙漠化敏感性的分布特点，为流域生态功能区划提供科学依据，以青海湖流域为研究区，根据《生态功能区划技术暂行规程》，选择湿润指数、冬春季大于6 m/s大风天数、土壤质地和植被覆盖（冬春）4个因子作为评价指标，在ArcGIS支持下生成单因子敏感性评价图，在此基础上基于空间叠加功能，对土地沙漠化进行综合评价。按土地沙漠化敏感度的高低将研究区分为极敏感、高度敏感、中度敏感、轻度敏感和不敏感5个级别。研究发现，青海湖流域土地沙漠化敏感性程度以中度敏感和高度敏感为主，分别占研究区域的34.24%、31.73%，轻度敏感和不敏感区域仅占整个流域的17.4%、0.03%。从土地沙漠化敏感性的空间分布来看，青海湖流域中部和环湖地区是土地沙漠化中度敏感和高度敏感相对集中的区域。

关键词: PDA, PDA

Abstract:

In order to figure out the distribution characteristics of land desertification sensitivity of Qinghai Lake Basin, and to provide scientific basis of watershed ecological function districts. Qinghai Lake Basin was chosen as a study area, in accordance with the Interim Regulation of Ecological Function Zoning, moisture index, days of strong wind (wind speed>6 m/s in winter and spring), soil texture, vegetation covering degree were selected as indicators of sensitivity evaluation of land desertification. A map of single-factor sensitivity evaluation was generated with supports of ArcGIS, moreover, a comprehensive evaluation of land desertification sensitivity was conducted with the supports of ArcGIS spatial overlay analysis. 5 classes of land desertification sensitivity ranging from low to extreme were generated: non-sensitivity zone, low sensitivity zone, moderate sensitivity zone, high sensitivity zone and extreme sensitivity zone. The results showed that about 0.03% of the study area was non-sensitivity zone, 17.4% of which was low sensitivity zone, 34.24% was moderate sensitivity zone, and 31.73% was high sensitivity zone. In spatial distribution, moderate sensitivity zone and high sensitivity zone seemed in the district around Qinghai Lake and central region.