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时间:2020-04-19
《红壤区土壤侵蚀危险程度分级初探.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第33卷第3期水土保持通报VoI.33,No.32013年6月BulletinofSoilandWaterConservationJun.,2013红壤区土壤侵蚀危险程度分级初探杨亚利,谢永生,赵暄(1.西北农林科技大学资源环境学院,陕西杨凌712i00;2.中国科学院水利部水土保持研究所,陕西杨凌712100)摘要:土壤侵蚀危险性分级是研究土壤侵蚀危险程度的重要方法。为了探索更加符合实际的土壤侵蚀及其危害程度分级方法,依据水利部土壤侵蚀分级标准和水利部科考成果,对南方红壤科考区的土壤侵蚀强度和土壤侵蚀潜在危险性及其所处流域主要湖泊
2、泥沙输比(SDR)进行分级。结果表明,科考区内轻度、中度、强度和极强度侵蚀均存在。中度侵蚀和强度侵蚀为主要侵蚀类型,占总侵蚀类型的84。轻度和极强度侵蚀占16。潜在危险性分级中,无险型、轻险型、危险型和极险型均存在,轻险和危险为主要类型,占总潜在危险类型的84,无险和极险类型占16。土壤侵蚀对异地的危害比较大,6O的湖泊SDR>0.5,其上游土壤侵蚀对异地是危险甚至极险的。研究结果可为红壤全区土壤侵蚀分级和治理工作提供参考。关键词:红壤区;侵蚀强度;潜在危险性;泥沙输移比;分级文献标识码:A文章编号:1000-288X(2013)0
3、3—0231-05中图分类号:S157.1PreliminaryStudyofGradationofSoilErosionHazardDegreeinRedSoilRegionofSouthernChinaYANGYa—li,XIEYong—sheng,ZHAOXuan(1.CollegeofResourcesandEnvironment,NorthwestA&FUniversity,Yangling,Shaanxi712100,China;2.InstituteofSoilandWaterConservation,CAS&MWR,
4、Yangling,Shaanxi712100,China)Abstract:Theriskgradationofsoilerosionisanimportantapproachtostudysoilerosionhazarddegree.Tofindasuitableapproachtothegradationofsoilerosionanditshazarddegreeinpractice,soilerosiondegreeanditspotentialriskforthescientificinvestigationareain
5、theredsoilregionofSouthernChina,aswellassedimentdeliveryratioforthemainlakeswithinthebasinsintheregion,weregradatedaccordingtotheMWR(MinistryofWaterResources)StandardsforsoilerosionclassificationandgradationandthedatafromthescientificinvestigationbytheMWR.Resultsshowed
6、thattherewerelight,moderate,intenseandex—tremelyintensesoilerosiondegreesintheinvestigatedarea.Themoderateerosionandintenseerosionwerethemainsoilerosiontypesandaccountedfor84ofthewholearea,whilethelighterosionandextremelyintenseerosionaccountedfor16.Thetypesofnorisk,li
7、ghtrisk,riskandextremeriskwereallfoundinthepotentialriskgradation.Thelightriskandriskwerethemainrisktypesandaccountedfor84ofal1therisktypes,whilethenoriskandextremeriskaccountedfor16.Soilerosionwasharmfultotheplacesnearby.Sedimentdeliveryratiosin6O9/6ofthelakesweregrea
8、terthan0.5,whichindicatesthatsoilerosionoccurredintheupstreamofthelakesisdangerous,evenextremelydangeroustotheplacesn
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