Natural and anthropogenic rates of soil erosion  

作　　者：Mark A.Nearing Yun Xie Baoyuan Liu Yu Ye 

机构地区：[1]USDA-ARS,Southwest Watershed Research Center,2000 Allen Rd.,Tucson,AZ 85719,USA [2]School of Geography,Bejjing Normal University,Beijing 100875,China [3]State Key Laboratory of Soil Erosion and Dryland Farming in the Loess Plateau,Northwest A&rF University,Yangling,Shaanxi 712100,China

出　　处：《International Soil and Water Conservation Research》2017年第2期77-84,共8页国际水土保持研究（英文）

摘　　要：Regions of land that are brought into crop production from native vegetation typically undergo a period of soil erosion instability,and long term erosion rates are greater than for natural lands as long as the land continues being used for crop production.Average rates of soil erosion under natural,non-cropped conditions have been documented to be less than 2 Mg ha^(-1) yr^(-1).On-site rates of erosion of lands under cultivation over large cropland areas,such as in the United States,have been documented to be on the order of6 Mg ha^(-1) yr^(-1)or more.In northeastern China,lands that were brought into production during the last century are thought to have average rates of erosion over this large area of as much as 15 Mg ha^(-1) yr^(-1) or more.Broadly applied soil conservation practices,and in particular conservation tillage and no-till cropping,have been found to be effective in reducing rates of erosion,as was seen in the United States when the average rates of erosion on cropped lands decreased from on the order of 9Mg ha^(-1) yr^(-1) to 6 or 7Mg ha^(-1) yr^(-1) between 1982 and 2002,coincident with the widespread adoption of new conservation tillage and residue management practices.Taking cropped lands out of production and restoring them to perennial plant cover,as was done in areas of the United States under the Conservation Reserve Program,is thought to reduce average erosion rates to approximately 1 Mg ha^(-1) yr^(-1) or less on those lands.

关 键 词：Row crop agriculture Soil conservation Conservation tillage NO-TILL Residue management Permaculture ISOTOPES Conservation reserve program Northeast China National Resource Inventory Hugh Hammond Bennett Virgin Lands Campaign CERRADO Beryllium10 

分 类 号：S15[农业科学—土壤学]