137Cs示踪法土壤侵蚀量估算的本底值问题

doi:10.11821/yj2010070003

Abstract

Abstract:

Soil erosion and its eco-environmental effects are important issues among environmental topics. Quantitative estimation or measurement of soil loss is one of the main fields in soil erosion researches. As a short-time consuming and relatively simple method, ¹³⁷Cs tracing technique was widely applied in quantitative estimation of soil loss caused by natural driving forces or human activities. Measurement of reference value is fundamental in estimating soil loss rate by the ¹³⁷Cs tracing method. Impacted by multi factors that intrinsically are of spatial heterogeneity, ¹³⁷Cs background fallout varied across landscapes. It was enucleated here how weather, topography, soil properties and land use/cover impacted spatial distribution of ¹³⁷Cs and strengthened its spatial variation. Meanwhile, existence of soil sample sites for ¹³⁷Cs references deposition value measurement and veracity of sample site selection were discussed. Based on the above analysis, a framework subdividing target area into humongous measurement units and employing hierarchical multi-reference system and topographical rectification were suggested as solutions for handling spatial heterogeneity of ¹³⁷Cs reference value. Further studies are needed to quantify the effect of each factor on spatial variation of ¹³⁷Cs reference fallout and to eventually establish principles and methods for subdividing measurement unit.

Key words: ¹³⁷Cs, soil erosion, reference value, spatial variation, rectification

LIU Yu, LV Yi-he, FU Bo-jie, LIU Guo-hua. Reference value of ¹³⁷Cs tracing technique in soil loss estimation: A spatial variation analysis[J].GEOGRAPHICAL RESEARCH, 2010, 29(7): 1171-1181.

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Reference value of ¹³⁷Cs tracing technique in soil loss estimation: A spatial variation analysis

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Reference value of 137Cs tracing technique in soil loss estimation: A spatial variation analysis

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Reference value of ¹³⁷Cs tracing technique in soil loss estimation: A spatial variation analysis