内蒙古中东部地区^(137)Cs背景值的确定  

Determination of ^(137)Cs reference inventory in the large scaleregion:A case study in the central and eastern Inner Mongolia Plateau

作　　者：胡云锋[1] 刘纪远[1] 巴图娜存[1] 甄霖[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101

出　　处：《地理学报》2014年第3期343-352,共10页Acta Geographica Sinica

基　　金：国家973计划(2010CB950904);国家自然科学基金(40971223);中国科学院知识创新方向性项目(KZCX2-EW-306)~~

摘　　要：在137Cs环境示踪研究中,区域137Cs背景值(CRI)的获取存在许多困难和不确定性。在总结传统137Cs区域背景值获取方法基础上,本文提出了适用于大尺度区域和长距离路线考察的区域137Cs背景值获取技术路线,即在参考有关地理背景信息和长时间序列遥感信息、科学划分子区基础上,根据理论模型计算得到区域137Cs背景值潜在值域,并开展基于137Cs土壤剖面分布形态特征的蚀积过程分析,最终确定137Cs区域背景样地和区域背景值。以上述技术流程为指导,本文作者在内蒙古高平原中东部地区开展案例研究,结果表明:兴安盟东部、南部暗栗钙土研究区的CRI为2447 Bq·m-2,通辽市中部、南部和赤峰市东部风沙土研究区的CRI为2430 Bq·m-2,赤峰市西北部黑钙土研究区的CRI为2384 Bq·m-2,锡林郭勒盟南部栗钙土研究区的CRI为2368 Bq·m-2。In isotope 137Cs tracing studies, it is a basic premise to select a suitable 137Cs reference inventory （CRI） sample plot and to determine an accurate CRI value. However, there are many difficulties and uncertainties in practical studies due to the heterogeneous spatial distributions of 137Cs deposition and different artificial operations in sampling and testing. In a large scale region or a long-distance field exploration, such difficulties and uncertainties become more obvious and annoying, which seriously impedes the developments of 137Cs tracing technology applied in wind eroded regions, such as the Mongolia Plateau and Northeast China Plain. In this paper, studies releted to the traditional CRI acquiring process were summarized at first, and then a systematic framework to get the CRI in large scale areas or long distance investigations was proposed. The framework covers 7 sub-processes and the core steps include： building sub-regions in a large area supported by geographical backgrounds and long time-serial remote sensing information, calculating the potential range of CRI according to the theoretic model which was developed by Walling D E, analyzing erosion/deposition processes based on 137Cs soil profile distribution patterns, and determining the final CRI plots and CRI values. Taking the central-eastern part of Inner Mongolia Plateau as the case study region, the above steps were implemented and depicted in detail. The CRI in dark chestnut soil zone located in the east and south of Xing＇an was 2447 Bq. m2, the CRI in aeolian sandy soil zone stood in the south and center of Tongliao and central Chifeng was 2430 Bq. m2, the CRI in sandy chernozem soil zone situated in the northwestern Chifeng was 2384 Bq.m^-2, and the CRI in chestnut soil zone located in the southern Xilingol was 2368 Bq. m2. Compared with the relevant consequences in the adjacent areas, the above results were believed to be reliable and accurate. The CRI determination framework and key steps offered an important basis for the future

关 键 词：大尺度区域 同位素示踪 137Cs背景值 采样方法 内蒙古 

分 类 号：S153[农业科学—土壤学]