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Using 137 Cs Tracer Technique to Evaluate Erosion and Deposition of Black Soil in Northeast China

作者：

Huajun Fang;Xueming Yang;Xiaoping Zhang;Aizhen Lian

单位：

Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012 (China);Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012 (China;Graduate School of the Chinese Academy of Sciences, Beijing 100039 (China);Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012 (China);Greenhouse & Processing Crops Research Centre, Agriculture & Agri-Food Canada, Harrow, Ontario, NOR 1GO (Canada)

关键词：

slope;137cs;the study;slope location;loss;137cs reference inventor

摘要：

Soil and water losses through erosion have been serious in the black soil region of Northeast China. Therefore, a sloping cultivated land in Songnen Plain was selected as a case study to: 1) determine the 137Cs reference inventory in the study area; 2) calculate erosion and deposition rates of black soil on different slope locations; 3) conduct a sensitivity analysis of some model parameters; and 4) compare overall outputs using four different models. Three transects were set in the field with five slope locations for each transect, including summit, shoulder-slope, back-slope, foot-slope, and toe-slope. Field measurements and model simulation were used to estimate a bomb-derived 137Cs reference inventory in the study area. Soil erosion and deposition rates were estimated using four 137Cs models and percentage of 137Cs loss/gain. The 137Cs reference value in the study area was 2 232.8 Bq m−2 with 137Cs showing a clear topographic pattern, decreasing from the summit to shoulder-slope, then increasing again at the foot-slope and reaching a maximum at the toe-slope. Predicted soil redistribution rates for different slope locations varied. Among models, the Yang Model (YANG-M) overestimated erosion loss but underestimated deposition. However, the standard mass balance model (MBM1) gave predictions similar to a mass balance model incorporating soil movement by tillage (MBM2). Sensitivity analysis of the proportion factor γ and distribution pattern of 137Cs in the surface layer demonstrated the impact of 137Cs enrichment on calculation of the soil erosion rate. Factors influencing the redistribution of fallout 137Cs in landscape should be fully considered as calculating soil redistribution rate using 137Cs technique.

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Using 137 Cs Tracer Technique to Evaluate Erosion and Deposition of Black Soil in Northeast China

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