| 2000-2013年北洛河河源区土壤侵蚀潜在风险时空变化分析 |
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| 引用本文： | 魏鹳举.2000-2013年北洛河河源区土壤侵蚀潜在风险时空变化分析[J].水土保持研究,2017(4). |
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| 作者姓名： | 魏鹳举 |
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| 作者单位： | 青海大学水利电力学院,西宁,810016 |
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| 基金项目： | 黄河水利科学研究院科技发展基金项目(黄科发201602)，河南省科技攻关计划项目(162101510004)，国家自然科学基金(41571276) |
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| 摘 要： | 以北洛河河源区为研究区,利用2000年、2013年Iandsat影像和DEM数据作为数据源,分别对土地利用类型、植被覆盖度和坡度信息进行提取,采用多因素综合分析法对土壤侵蚀风险进行快速评估,并对土壤侵蚀风险变化趋势、植被变化对土壤侵蚀风险的影响、水土保持措施优先等级等进行了分析.结果表明:(1)土壤侵蚀风险无变化区域面积最大,且风险减弱区域面积比(31.97％)大于风险增加区域面积比(16.05％).其中,中度土壤侵蚀风险区域相对于其他风险等级区域更加稳定;(2)土壤侵蚀风险变化区域内随着变化程度的增大,相应变化区域面积越小;(3)在土壤侵蚀风险减弱区,自然植被覆盖度增加和退耕的影响区域面积比分别为42.8％和57.2％,在土壤侵蚀风险增加区,自然植被覆盖度降低和开垦农田的影响区域面积比分别为93.7％和6.3％,且随着土壤侵蚀风险变化程度的增加,耕地类型转变的影响范围越大,自然植被覆盖度变化的影响范围越小.
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| 关 键 词： | 土壤侵蚀 多因素综合法 土地利用类型 植被覆盖度 坡度 退耕还林还草工程 |
Analysis on Spatiotemporal Change of Potential Risk of Soil Erosion in the Source Region of the Beiluo River from 2000 to 2013 |
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| Abstract: | The objective of this study is to assess the water erosion risk and dynamic change trend of spatial distribution in erosion status and intensity,analyze the effects of vegetation variation on erosion risk,and obtain the conservation priority map between 2000 and 2013 in the source region of the Beiluo River using a multicriteria evaluation method based on land cover types,fractional vegetation coverage and slope derived from Landsat7 ETM+ image in 2000,Landsat8OLI image in the 2013 and DEM data.The results show that:(1) the area of region with unchanged erosion risk is the largest,and the area proportion (31.97％) of region with decreasing erosion risk is larger than that (16.05％) of region with increasing erosion risk,the region with moderate risk is more stable than the area with other risk-level;(2) with the degree of variation of erosion risk getting greater,the area of region with corresponding variation degree of erosion risk will become less;(3) the area proportions of regions affected by improving natural vegetation cover and by abandoning farmland in the region with decreasing trend of erosion risk are 42.8％ and 57.2％,respectively,and the area proportions of regions affected by improving natural vegetation cover and by farming in the region with increasing trend of erosion risk are 93.7％ and 6.3％,respectively.The area affected by land cover change get larger and the area affected by natural vegetation coverage get smaller as the level of erosion risk get higher. |
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| Keywords: | soil erosion multicriteria evaluation method land cover type fractional vegetation coverage slope Grain for Green Project |
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