土壤颗粒组成对REE吸附量及侵蚀示踪精度的影响  

Effects of Soil Particle Composition on REE Adsorption Capacity and Erosion Tracing Precision

作　　者：肖海[1] 刘刚[1,2,3] 许文年 夏振尧[1] 杨悦舒[1] 杨奇[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [3]华中农业大学资源与环境学院,湖北武汉430070

出　　处：《中国稀土学报》2013年第5期627-635,共9页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(41201270);湖北省自然科学基金(2012FFB03801);黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-1211)资助

摘　　要：稀土元素(REE)示踪技术已被广泛应用于土壤侵蚀研究之中,为水土流失定量研究提供了一种精度较高的方法。但该方法在应用时较少考虑不同粒级土壤颗粒对REE吸附量的差异,从而影响了该方法计算结果的精确度。通过淋溶实验研究了REE在紫色土壤中的垂直迁移能力,并对紫色土中不同粒级土壤颗粒的REE吸附能力进行了分析,同时利用人工模拟降雨侵蚀实验对REE示踪技术精确度进行了研究。结果表明:REE在土壤中几乎没有发生垂直迁移,并且主要被吸附于小于0.075 mm的土壤颗粒之中。根据不同粒级土壤颗粒对REE的吸附量,对REE示踪土壤侵蚀量数据进行修正,使得计算结果的精确性得到了较大幅度的提高。The extensive application of REE tracing method in the field of soil erosion provided a high pre- cision method for the quantitative research on soil and water erosion. But the REEs＇ absorption difference in various soil particles was rarely considered in its appli-cation, thus the calculation precision of this method was restricted. In this paper, the vertical migration capacity of REE in purple soil was studied by leaching experiment. The REE adsorption capacity of various soil particles in purple soil was analyzed, and the pre-cision of REE tracing method was also researched by artificial simulation rainfall experiments. The results indicated that the vertical migration of REEs was faint. Meanwhile, most of them were absorbed by soil particles which were less than 0.075 mm. Accordingto the adsorption capacity various soil particles for REE, the erosion data was revised. Finally, the ca1- culation precision of soil erosion by REE tracing meth- od was obviously improved

关 键 词：REE示踪 土壤侵蚀 紫色土 粒级 

分 类 号：S157.1[农业科学—土壤学]