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针对全国水土保持区划中确定的22个具有水源涵养功能的基本功能区,利用第1次全国水利普查获取的水力侵蚀数据,分析这些区域的水力侵蚀现状。结果表明:1)水源涵养基本功能区水力侵蚀以轻中度侵蚀为主,超过80%,强烈、极强烈、剧烈面积分布较少,与全国基本状况相似;2)与第2次全国土壤侵蚀遥感调查成果相比,水源涵养基本功能区水力侵蚀整体上有所好转,水力侵蚀总面积减少3.75%,轻中度侵蚀面积大幅减少,减幅超过20%;3)水源涵养基本功能区局部地区水力侵蚀形势严峻,极强烈和剧烈侵蚀面积虽然不大,但是与第2次遥感调查成果相比,面积均有所增加,相对增幅较大,说明局部地区存在水力侵蚀恶化的现象。
According to the 22 basic functional areas with water conservation function identified in the national soil and water conservation zoning, the hydraulic erosion data obtained from the 1st National Water Census were used to analyze the status of hydraulic erosion in these areas. The results showed that: 1) Water erosion in the basic functional areas of water conservation was dominated by mild to moderate erosion, with more than 80% strong, extremely intense and less intense area distribution, similar to the national basic condition; 2) Compared with the second national soil erosion Compared with the results of remote sensing survey, the hydraulic erosion in the basic functional areas of water conservation improved overall, the total area of hydraulic erosion decreased by 3.75%, the area of mild to moderate erosion decreased substantially by more than 20%; 3) Although the situation of hydraulic erosion is severe, extremely intense and severe erosion area is small, compared with the results of the second remote sensing survey, the area has increased and the relative increase has been relatively large, indicating the deterioration of hydraulic erosion in some areas.