Acta Geographica Sinica ›› 2014, Vol. 69 ›› Issue (3): 343-352.doi: 10.11821/dlxb201403006

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Determination of 137Cs reference inventory in the large scale region:A case study in the central and eastern Inner Mongolia Plateau

HU Yunfeng, LIU Jiyuan, Batunacun, ZHEN Lin   

  1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2013-07-16 Revised:2013-12-27 Online:2014-03-20 Published:2014-03-20
  • Supported by:
    National Key Basic Research Program of China (973 Program),No.2010CB950904;National Natural Science Foundation of China,No.40971223;Knowledge InnovationProject of CAS. No.KZCX2-EW-306

Abstract: 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·m-2, the CRI in aeolian sandy soil zone stood in the south and center of Tongliao and central Chifeng was 2430 Bq·m-2, 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· m-2. 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 137Cs tracing studies, especially in the large scale regions and long distance excursions.

Key words: large-scale region, 137Cs reference inventory, sampling method, isotope tracing, Inner Mongolia