Pinpointing areas of increased soil erosion risk following land cover change in the Lake Manyara catchment, Tanzania
Pinpointing areas of increased soil erosion risk following land cover change in the Lake Manyara catchment, Tanzania
复制标题
查明坦桑尼亚曼雅拉湖流域土地覆盖变化后土壤侵蚀风险增加的区域
DOI:
10.1016/j.jag.2018.05.008
复制
发表时间:
2018
影响因子:
7.5
通讯作者:
Wynants M
中科院分区:
文献类型:
--
作者:
Wynants M
Lack of long-term scientific land cover and erosional data impedes the development of sustainable land management plans to tackle land degradation and soil erosion problems in Tanzania. Using Landsat imagery, almost three decades of land cover change in the Lake Manyara catchment (1988–2016) was reconstructed. Data highlight that the major land cover types are highly dynamic and that there is a net conversion of natural or semi-natural land cover towards agricultural uses. Specifically, the biggest net declining cover types were found to be ‘bushland’, ‘seasonal grassland’ and ‘permanent savanna’, which have reduced by 8.7, 6.1 and 3.5% respectively. In this context an erosion risk model, based on the ‘Revised Universal Soil Loss Equation’, was applied to evaluate how changing land cover has affected risk of surface soil erosion by water. Model outputs indicate that a lot of land conversion has occurred in areas that are naturally vulnerable due to topography, soil type and rainfall patterns, seriously increasing the soil erosion risk. The resulting output maps can be particularly useful in pinpointing potential areas of increased erosion risk underpinning targeted investigation and management action to support soil conservation for improved food and water security.
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DOI:
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1975
期刊:
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影响因子:
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作者:
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