Integrated universal soil loss equation (USLE) and Geographical Information System (GIS) for soil erosion estimation in A Sap basin: Central Vietnam
Integrated universal soil loss equation (USLE) and Geographical Information System (GIS) for soil erosion estimation in A Sap basin: Central Vietnam
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DOI：
10.1016/j.iswcr.2018.01.001
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发表时间：
2018-06
影响因子：
6.4
通讯作者：
T. G. Pham;J. Degener;M. Kappas
中科院分区：
文献类型：
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作者：
T. G. Pham;J. Degener;M. Kappas
越南中部是非常容易受到土壤侵蚀，由于其复杂的地形和强降雨，本研究的目的是量化土壤侵蚀在A萨普河流域，A罗区，顺化省，越南，使用通用土壤流失方程（USLE）和地理信息系统（GIS）。结果表明，34%的土地面积损失累积到10 t ha−1year− 1，而47%的总面积损失不到1 t ha−1year−1。天然林地损失最大，平均约为19 t ha− 1年−1，其次是种植园林，约为7 t ha− 1年− 1，其他农业用地，每年种植作物和水稻分别为3.70 t ha − 1年− 1和1.45 t ha− 1年− 1。土壤侵蚀对地形因子（LS）最为敏感，其次是耕作支持因子（P）、土壤可蚀性因子（K）、耕作管理因子（C）和降雨侵蚀力因子（R）。研究结果表明，改变耕作历和实行间作是防止耕地土壤侵蚀的有效途径，在阿萨普流域的山区引进阔叶树是减少土壤侵蚀的最有效措施。该研究还指出，将可用数据源与USLE和GIS技术相结合是计算越南中部土壤侵蚀的可行选择，这将使人们有针对性地关注解决方案，以减少未来的土壤侵蚀。
Central Vietnam is very susceptible to soil erosion due to its complicated terrain and heavy rainfall. The objective of this study was to quantify soil erosion in the A Sap river basin, A Luoi district, Thua Thien Hue Province, Vietnam, using the Universal Soil Loss Equation (USLE) and Geographical Information System (GIS). The results showed that 34% of land area lost accumulated to 10 t ha−1year−1while 47% of the total area lost less than 1 t ha−1year−1. Natural forest land lost the most with an average of about 19 t ha−1year−1, followed by plantation forest with approximately 7 t ha−1year−1and other agricultural lands at 3.70 and 1.45 t ha−1year−1for yearly crops and paddy rice, respectively. Soil erosion was most sensitive to the topographic factor (LS), followed by the practice support factor (P), soil erodibility factor (K), cropping management (C), and the rainfall erosivity factor (R). Implications are that changes to the cultivated calendar and implementing intercropping are effective ways to prevent soil erosion in cultivated lands. Furthermore, introducing broad leaves trees for mountainous areas in A Sap basin was the most effective practice in reducing soil erosion. The study also pointed out that the combination of available data sources used with the USLE and GIS technology is a viable option to calculate soil erosion in Central Vietnam, which would allow targeted attention toward a solution is to reduce future soil erosion.