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三江源植被保持土壤能力的时空变化

王雅琼 刘彦 阿彦 张建军 张岩 张守红 张艳婷

王雅琼, 刘彦, 阿彦, 张建军, 张岩, 张守红, 张艳婷. 三江源植被保持土壤能力的时空变化[J]. 环境科学研究, 2016, 29(7): 1023-1031.
引用本文: 王雅琼, 刘彦, 阿彦, 张建军, 张岩, 张守红, 张艳婷. 三江源植被保持土壤能力的时空变化[J]. 环境科学研究, 2016, 29(7): 1023-1031.
WANG Yaqiong, LIU Yan, A Yan, ZHANG Jianjun, ZHANG Yan, ZHANG Shouhong, ZHANG Yanting. Spatial and Temporal Variation of Soil Conservation Capability of Vegetation in Three-River Headwaters Region[J]. Research of Environmental Sciences, 2016, 29(7): 1023-1031.
Citation: WANG Yaqiong, LIU Yan, A Yan, ZHANG Jianjun, ZHANG Yan, ZHANG Shouhong, ZHANG Yanting. Spatial and Temporal Variation of Soil Conservation Capability of Vegetation in Three-River Headwaters Region[J]. Research of Environmental Sciences, 2016, 29(7): 1023-1031.

三江源植被保持土壤能力的时空变化

基金项目: 中国工程院咨询研究项目(2014-XZ-31-3)

Spatial and Temporal Variation of Soil Conservation Capability of Vegetation in Three-River Headwaters Region

  • 摘要: 为深入了解三江源区植被保持土壤的能力,以RS和GIS为技术支撑,在对三江源区植被覆盖度动态变化特征分析的基础上,利用SL190—2007《土壤侵蚀分类分级标准》推荐的中国土壤侵蚀模型CSLE(Chinese soil loss equation)估算了2000—2010年三江源区植被的土壤保持能力,并分析其时空动态变化特征. 结果表明:①2000—2010年三江源区年均植被覆盖度为43%~50%;植被平均土壤保持量为849~955 t/km2,并且空间差异很大,总体上呈自西北向东南增加的空间分布格局. ②2000—2010年植被的土壤保持能力呈逐渐增加趋势,其中2000—2005年各流域的土壤保持能力平均增加了约29 t/km2,并以大夏河与洮河流域土壤保持能力的增幅(约700 t/km2)最大,其次为玛曲至龙羊峡(约300 t/km2),羌塘高原区植被的土壤保持能力增幅(仅2.08 t/km2)最小;2005—2010年各流域的土壤保持能力呈现轻微增长,平均增加了约9 t/km2,其中增幅较大的是柴达木盆地东和直门达至石鼓流域(约16 t/km2),增幅最小的是羌塘高原区(仅3.90 t/km2). ③三江源植被土壤保持能力随植被覆盖度的增加呈非线性增长,可通过指数或幂函数形式表达. 研究显示,增加植被覆盖度有助于提高三江源区的土壤保持能力、控制区域土壤侵蚀.

     

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出版历程
  • 收稿日期:  2015-07-13
  • 修回日期:  2015-12-14
  • 刊出日期:  2016-07-25

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