Investigating the spatial distribution of soil erosion and deposition in a small catchment on the loess Plateau of China, using 137Cs
Investigating the spatial distribution of soil erosion and deposition in a small catchment on the loess Plateau of China, using 137Cs
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DOI：
10.1016/j.still.2005.03.010
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发表时间：
2006-06
影响因子：
6.5
通讯作者：
Mingyi Yang;Jun Tian;Pu-ling Liu
中科院分区：
文献类型：
--
作者：
Mingyi Yang;Jun Tian;Pu-ling Liu
了解流域土壤侵蚀和沉积的空间分布对于设计水土保持措施非常重要。传统监测技术提供的有关侵蚀和沉积空间模式的信息有限。沉降放射性核素 137Cs 用于记录位于陕西省安塞（中国黄土高原的代表）附近的一个小型（0.17平方公里）沟渠流域内土壤重新分布的速率和模式。当地参考库存估计为 2266Bqm−2，从流域收集的 198 个土壤核心的 137Cs 库存范围为 0 至 3849Bqm−2。各个岩心库存量的变异系数为0.85，反映了土壤侵蚀和沉积引起的137Cs重新分布的复杂模式。根据 137Cs 测量得出的侵蚀率估计范围为小于 25 至 150Mgha−1year−1，流域内约 70% 的净土壤流失来自沟壑区域。 137Cs 技术被证明可以提供记录小流域内土壤侵蚀和沉积空间分布的有效方法。
An understanding of the spatial distribution of soil erosion and deposition in a catchment is important for designing soil and water conservation measures. Traditional monitoring techniques provide limited information on the spatial patterns of erosion and deposition. The fallout radionuclide137Cs was used to document rates and patterns of soil redistribution within a small (0.17km2) gully catchment located near An'sai in Shaanxi Province, representative of the Loess Plateau of China. The local reference inventory was estimated to be 2266Bqm−2and the137Cs inventories of 198 soil cores collected from the catchment, ranged from 0 to 3849Bqm−2. The coefficient of variation of the inventories of the individual cores was 0.85, reflecting the complex pattern of137Cs redistribution by soil erosion and deposition. Estimates of erosion rates derived from137Cs measurement ranged from less than 25 to 150Mgha−1year−1, with about 70% of the net soil loss from the catchment coming from the gully area. The137Cs technique was shown to provide an effective means of documenting the spatial distribution of soil erosion and deposition within the small catchment.