Estimating Soil Erosion in Northeast China Using ^(137)Cs and ^(210)Pbex  

作　　者：YANG Yu-Hong YAN Bai-Xing ZHU Hui 

机构地区：[1]Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012 （China） [2]College of Water Resources, North China University of Water Resources and Electric Power, Zhengzhou 450011 （China）

出　　处：《Pedosphere》2011年第6期706-711,共6页土壤圈（英文版）

基　　金：Supported by the National Basic Research Program(973 Program)of China(No.2007CB407205);the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KSCX1-YW-09-13);the National Key Technology R&D Program of China during the 12th Five-Year Plan Period(No.2011BAD31B00);the National Major Science and Technology Program of China for Water Pollution Control and Treatment(No.009ZX07106-03-01)

摘　　要：Evaluation of soil erosion in agricultural fields is valuable to develop conservation practices for reducing agricultural nonpoint source pollution. Soil erosion rates were quantified using the fallout radionuclide tracer technique in Mojiagou Basin located on the outskirts of Changchun in Northeast China. The calculated soft erosion rates in the study area were 1.99 and 1.85 mm year-1 using 137Cs and excess 210pb （210Pbex） measurements, respectively. Both fallout radionuclides showed a similar tendency at downslope sites. All measured sites have experienced net erosion during the past 50 to 100 years. 137Cs and 210Pbex measurements were useful to quantify soil erosion rates on field and small basin scales. At this rate of erosion, the current fertile topsoil layer would be entirely removed within 70 years.Evaluation of soil erosion in agricultural fields is valuable to develop conservation practices for reducing agricultural nonpoint source pollution.Soil erosion rates were quantified using the fallout radionuclide tracer technique in Mojiagou Basin located on the outskirts of Changchun in Northeast China.The calculated soil erosion rates in the study area were 1.99 and 1.85 mm year-1 using 137Cs and excess 210Pb(210Pbex)measurements,respectively.Both fallout radionuclides showed a similar tendency at downslope sites.All measured sites have experienced net erosion during the past 50 to 100 years.137Cs and 210Pbex measurements were useful to quantify soil erosion rates on field and small basin scales.At this rate of erosion,the current fertile topsoil layer would be entirely removed within 70 years.

关 键 词：black soil fallout radionuclide tracer technique rainfall erosivity reference inventory soil loss 

分 类 号：S157.1[农业科学—土壤学] X834.02[农业科学—农业基础科学]