摘要
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。
Water erosion in twenty two soil and water conservation areas with basic water conservation function that were defined in the national regionalization of soil and water conservation was analyzed using the data obtained from the first national water resources census.More than 80％ of the areas suffered from light or moderate water erosion and few are subjected to severe or extremely severe erosion,which is consistent with the nation-wide census result.Compared with the result of the second national remote sensing investigation of soil erosion,the water erosion got improvement on the whole：the total area of water erosion decreased by 3.75％,and the area of light and moderate erosion decreased markedly by over 20％.Nevertheless,the overall situation of water erosion in these areas is still serious.Regardless of the low percentage of the area with severe or extremely severe erosion,their absolute area increased to a large extent compared with the result of the second national remote sensing investigation,indicating the deterioration of water erosion in some areas.
出处
《中国水土保持科学》
CSCD
2014年第1期62-67,共6页
Science of Soil and Water Conservation
基金
水利部项目"第一次全国水利普查"(1261221610325)
"全国水土流失动态监测与公告"(1261321610321)
关键词
水土保持
基本功能区
水力侵蚀
soil and water conservation
basic functional areas
water erosion
