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标题

137Cs在土壤中淋溶迁移模拟试验研究

作者

陈思宇; 魏欣; 韩玥; 钟岳志; 高晓飞; 刘宝元

机构

北京师范大学地理学与遥感科学学院; 北京大学城市与环境学院

摘要

137Cs作为示踪元素广泛应用于土壤侵蚀及泥沙沉积研究中,是对传统土壤侵蚀测定方法的重要补充。但也有学者对应用137Cs示踪技术的重要假设提出质疑,认为被土壤颗粒吸附的137Cs易解吸成为Cs+离子,随水流失或被植物吸收。而137Cs在土壤中的稳定性是决定其能否用于示踪土壤沉积与侵蚀的前提条件。因此,本文利用双层土柱模拟淋溶装置研究了137Cs和土壤粒径组成在不同雨量条件下的淋失和垂直迁移特征。研究结果发现,在600mm~3000mm降雨量内,土壤中137Cs平均含量为10.9Bq/kg,略小于试验前的11.5Bq/kg,其含量与雨量并无显著相关性,土壤中的137Cs有向下垂直迁移现象,但并不显著;土壤中137Cs活度与土壤中的粘粒含量有很好的正相关性,R2达到0.73;有待于增加模拟雨量,作进一步研究。

关键词

土壤侵蚀; 137Cs示踪;淋溶迁移;土壤粒径组成

引用

陈思宇; 魏欣; 韩玥; 钟岳志; 高晓飞; 刘宝元. 137Cs在土壤中淋溶迁移模拟试验研究.[J]. 北京师范大学学报(自然科学版),2016,52(5)635-638.

基金

分类号

S157

DOI

10.16360/j.cnki.jbnuns.2016.05.017

Title

137Cs Movements in Soil

Author

CHEN Siyu; WEI Xin; HAN Yue; ZHONG Yuezhi; GAO Xiaofei; LIU Baoyuan

Affiliations

School of Geography, Beijing Normal University; City and environment, Peking University

Abstract

137Cs is a widely used tracer in soil erosion research, complementing other measuring methods. Some have however questioned the 137Cs technology, because 137Cs adsorbed to soil particles could be easily desorbed into Cs + ions, with water loss or absorption by plants. 137Cs stability in soil is a precondition for its use to trace soil erosion. Therefore 137Cs and soil particle composition were studied under different rainfall leaching and vertical migration characteristics with double simulated soil column leaching device. It was found that within 600 mm - 3000 mm rainfall, average content of soil 137Cs was 10.9 Bq.kg-1, slightly less than 11.5 Bq.kg-1 in control. No significant correlation was found between soil 137Cs activity and rainfall, soil 137Cs showed vertical migration, but also not significant. A positive correlation was found between soil 137Cs and clay content, with R2 of 0.73. Larger simulated rainfall will be needed for further study.

Key words

soil erosion; 137Cs; leaching; migration; soil particle

cite

CHEN Siyu; WEI Xin; HAN Yue; ZHONG Yuezhi; GAO Xiaofei; LIU Baoyuan .137Cs Movements in Soil [J]. Journal of Beijing Normal University (Natural Science), 2016,52(5):635-638.

DOI

10.16360/j.cnki.jbnuns.2016.05.017

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
Designed by Mr. Sun Chumin. Email: cmsun@mail.bnu.edu.cn