A ^(210)Pb_(ex) mass balance model in cultivated soils in consideration of the radionuclide diffusion

作     者：张云奇 张信宝 龙翼 

作者机构：Sichuan Agriculture University Shandong Provincial Key Laboratory of Water and Soil Conservation & Environment ProtectionLinyi University Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2014年第25卷第4期

页      面：36-41页

核心收录：

学科分类：0807[工学-动力工程及工程热物理] 09[农学] 0903[农学-农业资源与环境] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 090301[农学-土壤学] 

基　　金：Supported by National Natural Science Foundation of China(Nos.41102224 and 41101259) 

主　　题：耕地土壤 平衡模型 放射性核素 扩散 质量 浓度梯度 连续培养 深度分布 

摘      要：The existing^(210)Pb_(ex)mass balance models for the assessment of cultivated soil erosion are based on an assumption that^(210)Pb_(ex)is quite evenly mixed within the plough ***,the amount of^(210)Pb_(ex)distributed in the soils below the plough depth,like a downward tail in the lower part of the^(210)Pb_(ex)profile,has been largely *** fact,after the initial cultivation of undisturbed soils,^(210)Pb_(ex)will diffuse downward from plough layer to the plough pan layer due to the concentration ***^(210)Pb_(ex)inventory is constant,the depth distribution in the two layers of the cultivated soils will achieve a steady state after continuous cultivation for 10.37 years,when^(210)Pb_(ex)is evenly distributed in the soils of the plough layer with an exponential concentration decline with depth in the soils of the plough pan layer,and the^(210)Pb_(ex)concentration at any depth will be invariable with *** work reported in this paper attempts to explain the formation of the^(210)Pb_(ex)tail in the soil profile below the plough depth by theoretical derivation of the^(210)Pb_(ex)depth distribution process in the two layers of the cultivated soils,propose a^(210)Pb_(ex)mass balance model considering^(210)Pb_(ex)diffusion based on the existing model,and discuss the influence of the^(210)Pb_(ex)tail to the existing model.