Distribution characteristics of 137Cs in wind-eroded soil profile and its use in estimating wind erosion modulus  

作　　者：HUYunfeng LIUJiyuan ZHUANGDafang CAOHongxia YANHuimin YANGFengting 

机构地区：[1]InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences,Beijing100101,China

出　　处：《Chinese Science Bulletin》2005年第11期1155-1159,共5页

基　　金：the Chinese National Key Basic Research Promotion Program(Grant No.2002CB412500); the Chinese Acad-emy of Sciences Knowledge Innovation Project(Grant No.KZCX-2-308).

摘　　要：Due to its inert reaction in soil system and distinctive vertical distribution in soil profile, caesium-137 (137Cs) has been used as a tracer to assess wind erosion. In this study, 62 soil samples were collected from 4 sampling sites in Taipusi County, Inner Mongolia; Caesium-137 activities for those soil samples were measured using a gamma-ray spectrometry in Sichuan University, Chengdu. Distribution pattern of 137Cs in vertical soil profile was different for different land use and land cover types. Caesium-137 was distributed homogeneously in plow layer of cropland, and negatively exponential in low to medium cover grassland. Distribution pattern in high covered grassland was represented by a peak at 2-4 cm soil depth followed by a negative exponential curve. Based on those findings, simplified mass balance model was chosen to estimate the rate of wind erosion for cropland, while profile distribution model was used for grassland. Estimated wind erosion rates were 7990,4270 and 1808 Mg·km-2·a-1 for cropland, low cover grassland and medium cover grassland, respectively. Wind erosion intensity correlated negatively with plant cover.Due to its inert reaction in soil system and distinctive verticaldistribution in soil profile, caesium-137 (^(137)Cs) has been used as a tracer to assess winderosion. In this study, 62 soil samples were collected from 4 sampling sites in Taipusi County,Inner Mongolia; Caesium-137 activities for those soil samples were measured using a gamma-rayspectrometry in Sichuan University, Chengdu. Distribution pattern of Cs in vertical soil profile wasdifferent for different land use and land cover types. Caesium-137 was distributed homogeneously inplow layer of cropland, and negatively exponential in low to medium cover grassland. Distributionpattern in high covered grassland was represented by a peak at 2 — 4 cm soil depth followed by anegative exponential curve. Based on those findings, simplified mass balance model was chosen toestimate the rate of wind erosion for cropland, while profile distribution model was used forgrassland. Estimated wind erosion rates were 7990,4270 and 1808 Mg·km^(-2)·a^(-1) for cropland,low cover grassland and medium cover grassland, respectively. Wind erosion intensity correlatednegatively with plant cover.

关 键 词：风化作用 铯元素 分布特征 风化模型 

分 类 号：P59[天文地球—地球化学]