桂林典型岩溶峰丛洼地137Cs和210Pbex分布特征

为探究岩溶峰丛洼地侵蚀堆积的土壤剖面特征，进一步解决水土流失问题，利用137Cs、210Pbex双核素示踪法，对研究区主要的不同土地利用方式下的土壤剖面核素活度进行研究。结果表明：土地利用类型是土壤剖面核素分布的重要影响因素，一定的人为干扰下果园地的活度分布深度较为均匀，乔灌林地和撂荒地剖面活度随深度增加而骤减；在岩溶峰丛洼地，137CS和210Pbex放射性比活度在土壤上层表现为高度正相关，双核素联合示踪法可以较好地表现土壤分布特征。

Distribution Characteristics of 137Cs and 210Pbex in Typical Karst Peak-cluster Depressions in Guilin

In order to explore the soil profile characteristics of erosion accumulation in karst peak-cluster depression and further solve the problem of soil and water loss, the radioactivity of soil profile under main different land use modes in the study area was studied using 137Cs and 210Pbex dual-nuclide tracer method. According to the result, land use type is an important influencing factor on the distribution of radionuclides in soil profile and orchard land is disturbed artificially. The activity distribution depth was relatively uniform, and the section activity of Arbor-shrub Forest land and abandoned wasteland decreased rapidly with the increase of depth. In karst peak-cluster depression, 137Cs and 210Pbex radioactivity were highly positively correlated in the upper soil layer, and dual-nuclide combined tracer method could better represent the soil distribution characteristics.