【摘要】：基于修正的通用土壤流失方程(RUSLE)和GIS空間分析技術(shù),定量分析了安徽省土壤侵蝕及其養(yǎng)分流失的空間分布特征,探討了土壤侵蝕強(qiáng)度與海拔、坡度等地形因子的關(guān)系。結(jié)果表明:2010年安徽省土壤侵蝕總量為3 454×104 t a-1,土壤侵蝕模數(shù)平均值為256.9 t km-2 a-1。全省以微度土壤侵蝕為主,侵蝕強(qiáng)度由北向南逐漸加劇。淮北與沿淮平原、江淮丘陵崗地以微度土壤侵蝕為主,皖南丘陵山區(qū)和皖西大別山區(qū)以強(qiáng)度侵蝕為主。海拔200~500 m和坡度15°~25°的區(qū)域土壤侵蝕量最大。不同土壤侵蝕強(qiáng)度在各高程、坡度帶的面積分布比例規(guī)律相似,隨著海拔和坡度的增加,土壤侵蝕強(qiáng)度逐漸加劇。微度侵蝕的面積比例逐漸減小,其他侵蝕強(qiáng)度的面積比例逐漸增加。全省因土壤侵蝕引起的土壤有機(jī)碳(SOC)、全氮(TN)、全磷(TP)和全鉀(TK)等養(yǎng)分流失總量為106.6×104 t a-1,其中SOC、TN、TP和TK的平均流失量分別為3.57、0.37、0.10和3.90 t km-2 a-1。土壤養(yǎng)分流失量總體上由北向南逐漸增多,淮北與沿淮平原四種養(yǎng)分平均流失量和流失總量最小,皖南丘陵山區(qū)平均流失量和流失總量最大。
[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，

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