水土保持通报2017，Vol.37Issue(5)：342-346,5.DOI:10.13961/j.cnki.stbctb.2017.05.058
应用137Cs示踪技术估算土壤侵蚀的若干问题探讨
Several Key Issues on Using 137Cs Method for Soil Erosion Estimation
摘要
Abstract
[Objective] This work was to examine several key issues of using the 137Cs method to estimate soil erosion rates in order to improve and standardize the method.[Methods] Based on the comprehensive review and synthesis of a large body of published literature and extensive long-term research experience,several key issues in the application of the 137Cs method were generalized.[Results] The core assumption that spatial distribution of 137Cs inventories is uniform is invalid,and that the 137Cs method cannot be used to estimate quantitative soil erosion rates using a single soil core sample.The author emphasized that there existed a random component in 137 Cs spatial variation,and showed that this spatial random component was the largest uncertainty contributor of the 137Cs method using the previous results from a sensitivity and uncertainty analysis.[Conclusion] The erosion estimation error resulting from spatial random variation can be filtered out by using a mean 137Cs inventory of multiple independent soil cores or samples.The spatial random component can be removed using appropriate sampling designs for taking independent samples based on geostatistical properties.Although the 137Cs erosion models have been widely used in the literature,none of them has been vigorously tested and validated due to the lack of measured long-term soil loss data,and most models still remain theoretical.Because extremely large differences exist between model estimates,model validation and evaluation are utterly important for successful application and acceptance of the 137Cs method.关键词
土壤侵蚀/137Cs示踪/空间随机变化/独立样本Key words
soil erosion/137 Cs tracer/spatial random variation/independent soil samples分类
天文与地球科学引用本文复制引用
张勋昌..应用137Cs示踪技术估算土壤侵蚀的若干问题探讨[J].水土保持通报,2017,37(5):342-346,5.基金项目
国家重点研发计划项目“黑土侵蚀防治机理与调控技术”(项目编号2016YFE0202900) （项目编号2016YFE0202900）
国家自然科学基金项目“黑土区多种外营力相互作用的坡面侵蚀过程与机理”(41571263) （41571263）
