红壤丘陵区土壤137Cs含量与土壤颗粒组成的关系研究--以江西省丰城市为例

通过对江西省红壤地区的39个土壤剖面采样数据进行数理统计分析,发现在土壤表层20 cm范围内,不同土层137Cs含量与土壤粒径具有一定的相关性,其中与砂粒含量和粉砂粒含量具有正相关关系,与砾石含量和黏粒含量具有负相关关系。通过逐步回归分析发现,在各土层与137Cs含量关系最为密切是砂砾含量,两者呈现显著的正相关关系。同时建立了137Cs含量与砂砾含量的定量关系模型,并通过方差分析证明该模型可靠,但该模型应用于土壤侵蚀还需要进一步研究。

Relationship Between 137Cs Content and Composition of Soil Particles in Red Soil Region--A Case Study of Fengcheng City,Jiangxi Province

The()~(137)Cs tracing method is extensively used in the research fields of soil erosion and sediment transportation.For using the method,it is very important to determine the relationship between()~(137)Cs and the composition of soil particles.However,at present,research on this aspect is not well conducted.So,based on the data of 39 soil profiles in different areas of red soil,this paper analyzed the relationship between()~(137)Cs content and the composition of soil particles using statistical methods.The result showed that()~(137)Cs had a positive correlation with sand and silt contents,and had a negative correlation with gravel and clay contents within 20 cm of the soil surface.Then through correlation analysis and stepwise regression analysis,it was found that in different layers,sand content was the main factor contributing to()~(137)Cs.The quantitative model for the relationship between()~(137)Cs and the composition of soil particles was constructed.The model showed that()~(137)Cs increased with the increasing of sand content.