Distribution of 137Cs and 60Co in plough layer of farmland: Evidenced from a lysimeter experiment using undisturbed soil columns

作     者：Wenxiang LIU Yong LI Hanqing YU Surinder SAGGAR Daozhi GONGI Qiong ZHANG Wenxiang LIU;Yong LI;Hanqing YU;Surinder SAGGAR;Daozhi GONG;Qiong ZHANG

作者机构：lstiute of En/noumewr and Sutainable Doelopmen in ApriculureChinese Academy of Agrcdtwrad Scences.Bejing 00081Chinma Guangd UniweninNaneing 530005China Maraak Whenan-Landcare ResearhPriare Bog 11052Palmerston North 442New Zealand Minclear aud Radiaton Safr CemerMinisry of Eviromensal Proecrion时ChinaBeijing 00002China 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2021年第31卷第1期

页      面：180-190页

核心收录：

学科分类：12[管理学] 082803[工学-农业生物环境与能源工程] 07[理学] 08[工学] 09[农学] 1204[管理学-公共管理] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0828[工学-农业工程] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0901[农学-作物学] 120405[管理学-土地资源管理] 0713[理学-生态学] 

基　　金：the IAEA Project (No. 18176) the National Science and Technology Major Projects of China (No. 2013ZX06002001) that supported this work part of the project supported by the National Key Research and Development Program of China (No. 2017YFC0505402) 

主　　题：aeolian sandy soil brown soil deposited radionuclide migration depth radionuclide vertical migration rate 

摘      要：Radionuclide fallout during nuclear accidents on the land may impair the atmosphere, contaminate farmland soils and crops, and can even reach the groundwater. Previous research focused on the field distribution of deposited radionuclides in farmland soils, but details of the amounts of radionuclides in the plough layer and the changes in their proportional distribution in the soil profile with time are still inadequate. In this study, a lysimeter experiment was conducted to determine the vertical migration of 137Cs and 60Co in brown and aeolian sandy soils, collected from the farmlands adjoining Shidaowan Nuclear Power Plant(NPP) in eastern China, and to identify the factors influencing their migration depths in soil. At the end of the experiment(800 d), 96% of added 137Cs and 60Co were retained in the top 0–20 cm soil layer of both soils;very little 137Cs or 60Co initially migrated to 20–30 cm, but their amounts at this depth increased with time. The migration depth of 137Cs was greater in the aeolian sandy soil than in the brown soil during 0–577 d, but at the end of the experiment, 137Cs migrated to the same depth(25 cm) in both soils. Three phases on the vertical migration rate(v) of 60Co in the aeolian sandy soil can be identified: an initial rapid movement(0–355 d, v = 219 ± 17 mm year-1), followed by a steady movement(355–577 d, v = 150 ± 24 mm year-1) and a very slow movement(577–800 d, v = 107 ± 7 mm year-1). In contrast, its migration rate in the brown soil(v = 133 ± 17 mm year-1) was steady throughout the 800-d experimental period. The migration of both 137Cs and 60Co in the two soils appears to be regulated by soil clay and silt fractions that provide most of the soil surface area, soil organic carbon(SOC), and soil pH, which were manifested by the solid-liquid distribution coefficient of 137Cs and 60Co. The results of this study suggest that most 137Cs and 60Co remained within the top layer(0–20 cm depth) of farmland soils following a simulated NPP acc