农耕地土壤137Cs与210Pbex深度分布过程对比研究

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	农耕地土壤137Cs与210Pbex深度分布过程对比研究
	龙翼; 张信宝; 贺秀斌
刊名	核农学报
	2012
卷号	26 期号:4 页码:692-698
关键词	农耕地土壤 137Cs 210Pbex 深度分布过程
其他题名	COMPARISON OF THE DEPTH DISTRIBUTION PROCESSES FOR 137Cs AND 210Pbex IN CULTIVATED SOILS
通讯作者	于兴修
合作状况	国内
中文摘要	探讨了137Cs与210Pbex在农耕地土壤深度分布过程的差异。基于137Cs与210Pbex的不同沉降过程,考虑到核素由犁耕层向犁底层的扩散,对农耕地土壤137Cs、210Pbex的深度分布过程进行了理论推导,并以杨凌符家庄麦田剖面的实测数据予以验证,同时讨论了实测符家庄麦田剖面137Cs、210Pbex深度分布的规律特征及其原因,以此阐明了137Cs与210Pbex在农耕地土壤深度分布过程的差异。137Cs源于大气核试爆,没有持续沉降补充,犁耕层和犁底层土壤137Cs深度分布一直处于随时间变化的非稳定态;而210Pbex是天然核素,存在大气沉降的持续补充,犁耕层和犁底层土壤210Pbex深度分布最终呈稳定态。农耕地土壤137Cs、210Pbex深度分布的实测值曲线与理论值曲线的差异,尤其210Pbex,可能与耕作深度的变化历史或土地利用(覆被)变化有关。
英文摘要	This paper focuses on the different processes of 137Cs and 210 Pbex depth distribution in cultivated soils． In view of their different fallout deposition processes，considering radionuclide will diffuse from the plough layer to the plough pan layer duo to the concentration gradient between the two layers，the 137Cs and 210 Pbex depth distribution processes were theoretically derived． Additionally，the theoretical derivation was verified by the measured 137Cs and 210 Pbex values in the soil core collected from wheat field in Fujiazhuang， Shanxi Province， China， and the 137Cs and 210 Pbex concentrations variation with depth in soils of the wheat field was explained rationally． The 137Cs depth distribution state in cultivated soils will consistently vary with time due to 137Cs continual decay and diffusion as an artificial radionuclide without sustainable fallout input since 1960s． In contrast，the 210 Pbex depth distribution in cultivated soils will achieve steady state because of sustainable deposition of the naturally occurring 210 Pbex fallout，and it can be concluded that the differences between the theoretical and the measured values，especially for 210 Pbex ，might be associated with the history of plough depth variation or LUCC．
分类号	S153.6
收录类别	CSCD
资助信息	国家自然科学基金(41102224,40971169,41101259);国家重点基础研究“973”(2006CB403203)
语种	中文
公开日期	2013-02-01
内容类型	期刊论文
源URL	[http://192.168.143.20:8080/handle/131551/4873]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
推荐引用方式 GB/T 7714	龙翼,张信宝,贺秀斌. 农耕地土壤137Cs与210Pbex深度分布过程对比研究[J]. 核农学报,2012,26(4):692-698.
APA	龙翼,张信宝,&贺秀斌.(2012).农耕地土壤137Cs与210Pbex深度分布过程对比研究.核农学报,26(4),692-698.
MLA	龙翼,et al."农耕地土壤137Cs与210Pbex深度分布过程对比研究".核农学报 26.4(2012):692-698.