摘要
辽宁省是我国水土流失较为严重的省份之一。依据省内各市县水土流失面积占总面积的百分比及地形地貌等地质条件，将其划分为极严重区(>55％),严重区(40％～55％),中度区(25％～40％)及轻度区(＜25%)四个水土流失程度区。严重的水土流失不仅造成水土资源的损失与环境破坏，导致农业生产环境恶化，生态平衡失调，洪涝灾害频发，而且影响各业生产和发展。1996年与1986年的水土流失量对比结果表明，经过10年来的综合治理，水土流失强度和面积都明显降低和减少。
LiaoningprovinceisoneoftheheavistprovincesofsoilerosioninChina.Basedonthepercentofsoilerosionarea,topographicandgeomorphicconditionsinLiaoningprovince,itcanbedividedinto4soilerosiondegreeareas:theareaofextremelyhighdegreeofsoilerosion(>55％),distributinginChaoyang,Fuxincitiesand10counties,suchasJianchang,Yixian,Kangpingcounties,etc.;theareaofhighdegreeofsoilerosion(40％～55％）,distributingin8counties,suchasSuizhong,Xingcheng,Faku,Zhuanghe,Pulandian,etc.;theareaofmiddledegreeofsoilerosion(25％～40％),distributinginEastLiaoninglowmountainsandhillsarea,suchasAnshan,Yingkou,Dandong,etc.;andtheareaoflowdegreeofsoilerosion(ThemajorhazardscausedbysoilerosioninLiaoningprovinceinclude:①loweringthefertilityofsoilanddestroyingthebasicconditionsofmagriculturalproduction;②siltingupreservoirs,blockingupchannels,thencausingfrequentfloodorwaterloggingdamages;③heavilydamagingecologicenvironments,loosingthenecessaryconditionsofsustainaldevelopmentofagriculturaleconomy;④causingheavylossesinlives,propertyandnationaleconomy. Fromthecompmaringofthesoilerosionareasin1986andin1996,wecanseethesoilerosionareahasobviouslybeengettinglower,showingthatthesituationhasafavourableturnthroughtenyearsofeffectivecomprehensiveharness.
关键词
辽宁省
水土流失
地质环境
演变趋势
Liaoningprovince
soilerosion
geologicalenvironment
evolutiontrend
