基于RUSLE模型的安徽省土壤侵蚀及其养分流失评估
发布时间:2019-06-03 19:55
【摘要】:基于修正的通用土壤流失方程(RUSLE)和GIS空间分析技术,定量分析了安徽省土壤侵蚀及其养分流失的空间分布特征,探讨了土壤侵蚀强度与海拔、坡度等地形因子的关系。结果表明:2010年安徽省土壤侵蚀总量为3 454×104 t a-1,土壤侵蚀模数平均值为256.9 t km-2 a-1。全省以微度土壤侵蚀为主,侵蚀强度由北向南逐渐加剧。淮北与沿淮平原、江淮丘陵岗地以微度土壤侵蚀为主,皖南丘陵山区和皖西大别山区以强度侵蚀为主。海拔200~500 m和坡度15°~25°的区域土壤侵蚀量最大。不同土壤侵蚀强度在各高程、坡度带的面积分布比例规律相似,随着海拔和坡度的增加,土壤侵蚀强度逐渐加剧。微度侵蚀的面积比例逐渐减小,其他侵蚀强度的面积比例逐渐增加。全省因土壤侵蚀引起的土壤有机碳(SOC)、全氮(TN)、全磷(TP)和全钾(TK)等养分流失总量为106.6×104 t a-1,其中SOC、TN、TP和TK的平均流失量分别为3.57、0.37、0.10和3.90 t km-2 a-1。土壤养分流失量总体上由北向南逐渐增多,淮北与沿淮平原四种养分平均流失量和流失总量最小,皖南丘陵山区平均流失量和流失总量最大。
[Abstract]:Based on the modified general soil loss equation (RUSLE) and GIS spatial analysis techniques, the spatial distribution characteristics of soil erosion and nutrient loss in Anhui Province were quantitatively analyzed, and the relationship between soil erosion intensity and topographic factors such as altitude and slope was discussed. The results showed that the total amount of soil erosion in Anhui Province in 2010 was 3454 脳 104 t a 鈮,
本文编号:2492186
[Abstract]:Based on the modified general soil loss equation (RUSLE) and GIS spatial analysis techniques, the spatial distribution characteristics of soil erosion and nutrient loss in Anhui Province were quantitatively analyzed, and the relationship between soil erosion intensity and topographic factors such as altitude and slope was discussed. The results showed that the total amount of soil erosion in Anhui Province in 2010 was 3454 脳 104 t a 鈮,
本文编号:2492186
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