应用RUSLE模型和多源数据海南岛水土流失风险空间分析

Spatial Analysis of Soil Erosion Risk in Hainan Island by Applying RUSLE Model and Multi-Source Data

为了全面评估海南岛水土流失风险,使用遥感和GIS技术,整合多源异构空间数据集,结合RUSLE模型,评价其水土流失强度等级及流失量特征。结果表明,海南岛土壤侵蚀模数为3.16t/hm^(2)·a,整体属微度等级,总水土流失量为4.66×10^(6)t/a;各风险等级所占面积依次为轻度(91.47%)>中度(6.06%)>剧烈(1.52%)>强度(0.72%)>极强(0.23%),相应地产生的流失量占比依次为剧烈(2.08%)<极强(4.54%)<强度(5.53%)<中度(12.60%)<轻度(75.24%)。海南岛水土流失风险呈破碎化分布,高侵蚀模数主要分布于环岛25~60km地带的丘陵、山地地带。

In order to comprehensively assess the soil erosion risk of Hainan Island,remote sensing and GIS technologies were used to integrate multi-source heterogeneous spatial datasets,combined with the RUSLE model to evaluate its soil erosion intensity level and loss characteristics.The results show that the soil erosion modulus of Hainan Island is 3.16t/hm^(2)·a,the whole is of slight grade,and the total soil erosion amount reaches 4.66×10^(6)t/a;the area occupied by each risk grade is in the following order:Mild(91.47%)>Moderate(6.06%)>Vigorous(1.52%)>Intense(0.72%)>Very intense(0.23%),and accordingly,the percentage of loss generated is in the order of Vigorous(2.08%)<Very Intense(4.54%)<Intense(5.53%)<Moderate(12.60%)<Mild(75.24%).The soil erosion risk on Hainan Island is distributed in a fragmented manner,and the high erosion modulus is mainly distributed in the hilly and mountainous areas in the 25~60km zone around the island.