Using 137Cs tracer technique to evaluate erosion and deposition of black soil in Northeast China

被引:42
作者
Fang, HJ [1 ]
Yang, XM
Zhang, XP
Liang, AZ
机构
[1] CAS, NE Inst Geog & Agr Ecol, Changchun 130012, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
[3] Agr & Agri Food Canada, Greenhouse & Proc Crops Res Ctr, Harrow, ON N0R 1G0, Canada
基金
中国国家自然科学基金;
关键词
black soil; cesium-137 (Cs-137); Northeast China; quantitative models; soil erosion;
D O I
10.1016/S1002-0160(06)60044-1
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
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 Cs-137 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 Cs-137 reference inventory in the study area. Soil erosion and deposition rates were estimated using four Cs-137 models and percentage of Cs-137 loss/gain. The Cs-137 reference value in the study area was 2232.8 Bq m(-2) with Cs-137 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 gamma and distribution pattern of Cs-137 in the surface layer demonstrated the impact of Cs-137 enrichment on calculation of the soil erosion rate. Factors influencing the redistribution of fallout Cs-137 in landscape should be fully considered as calculating soil redistribution rate using Cs-137 technique.
引用
收藏
页码:201 / 209
页数:9
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