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137Cs作为土壤侵蚀的示踪剂得到广泛的应用,研究发现不同地区土壤中,137Cs分布有一定差别。以南方红壤为研究对象,对滇池流域不同土地利用下137Cs分布状况进行了研究。结果显示:137Cs空间分布的变化规律受地形空间分异因素的影响。在水平方向上,137Cs空间分布的差异是由于含137Cs土壤颗粒中重新分布和迁移流失造成的;在垂直方向上,剖面分布特征明显,不同土地利用类型由于人类活动以及自然下渗作用而有含量与深浅的差别。这对137Cs示踪土壤侵蚀的模型选择、土壤侵蚀程度判断甚至重新建模都具有积极的指导意义。
137Cs as a tracer of soil erosion has been widely used, the study found that 137 Cs in different parts of the soil distribution there is a certain difference. Taking the red soil in southern China as an example, the distribution of 137Cs under different land use in Dianchi Lake was studied. The results showed that the spatial variation of 137Cs was affected by the spatial differentiation of 137Cs. In the horizontal direction, the spatial distribution of 137Cs is attributed to the redistribution and migration of 137Cs in soil particles. In the vertical direction, the distribution of 137Cs is obvious, and the distribution of 137Cs is different due to human activities and natural infiltration Difference with the depth. This has a positive guiding significance for the model selection of 137Cs tracing soil erosion, judgment and even re-modeling of soil erosion.