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
Wynants M
中科院分区:
地球科学1区
文献类型:
--
作者:
Wynants M

文献摘要

参考文献

被引文献

相似文献

由于缺乏长期的科学土地覆盖和侵蚀数据,阻碍了制定可持续土地管理计划,以解决坦桑尼亚的土地退化和土壤侵蚀问题。利用陆地卫星图像,重建了马尼亚拉湖流域近三十年(1988-2016)的土地覆盖变化。数据突出表明,主要的土地覆被类型是高度动态的,自然或半自然的土地覆被净转化为农业用途。其中,净减少量最大的植被类型是“草地”、“季节性草地”和“永久性稀树草原”,分别减少了8.7%、6.1%和3.5%。在这种情况下,侵蚀风险模型的基础上,“修订的通用土壤流失方程”,应用于评估土地覆盖的变化如何影响水的地表土壤侵蚀的风险。模型的结果表明,由于地形、土壤类型和降雨模式,许多土地转换发生在自然脆弱的地区,严重增加了土壤侵蚀的风险。由此产生的产出图特别有助于查明侵蚀风险增加的潜在地区,支持有针对性的调查和管理行动,以支持土壤保护,改善粮食和水安全。
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.
DOI: --
发表时间: 1975
期刊: --
影响因子: --
作者:
B. Stewart
通讯作者: B. Stewart
东非畜牧业、生物多样性和稀树草原景观的形成
DOI: 10.2307/1161510
发表时间: 1996
期刊: Africa
影响因子: 1.2
作者:
P. Little
通讯作者: P. Little
坦桑尼亚的农民和市场:政策改革如何影响非洲农村生计
DOI: --
发表时间: 2002
期刊:
影响因子: --
作者:
S. Ponte
通讯作者: S. Ponte
坦桑尼亚东北部曼雅拉湖次流域水资源综合管理战略发展计划
DOI: --
发表时间: 2004
期刊:
影响因子: --
作者:
J. Ngana;R. Mwalyosi;P. Yanda;N. Madulu
通讯作者: N. Madulu
肯尼亚 Embu 和 Mbeere 地区土地利用变化、土地退化和生物多样性之间的联系 LUCID 工作
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
J. Maitima;L. Gachimbi;S. Mugatha;S. Mathai;J. Olson;Robert M Mutugi;P. Kamau;J. Otuoma
通讯作者: J. Otuoma