The scientific application of stabilized materials has been considered an effective method for the in situ remediation of Cd-contaminated soil.This study aimed to investigate the per-sistence of the effect of a combined amendment of limestone and sepiolite (LS) on soil Cd availability and accumulation in rice grown in a mildly Cd-contaminated paddy field(0.45 mg/kg of Cd) over three consecutive rice seasons.1125-4500 kg/ha of LS was applied to the soit before the first rice planting season and 562.5-2250 kg/ha of LS was supplemented before the third rice planting season.The application of LS (1125-4500 kg/ha) increased the soil pH by 0.44-1.09,0.18-0.53,and 0.42-0.68 in the first,second,and third season,respec-tively,and decreased the soil acid-extractable Cd content by 18.2-36.4％,17.7-33.5％,and 9.6-17.6％.LS application significantly decreased the Cd contents in the rice tissues.The ap-plication of 4500 kg/ha of LS decreased the Cd content in brown rice to below the National Food Limit Standard of 0.2 mg/kg (GB 2762-2017) in the three consecutive rice seasons.How-ever,the effect of LS on the soil-rice system was significantly weakened in the third season.The supplementary application of 562.5-2250 kg/ha of LS further decreased the Cd con-tent in brown rice by 26.1-56.5％ and decreased the health risk index by 23.7-43.8％.There-fore,it was recommended to apply 4500 kg/ha of LS in the first season and to supplement 2250 kg/ha of LS in the third season to effectively guarantee the clean production of rice in three consecutive rice seasons.

Wenjun Yang;Shilong Wang;Hang Zhou;Min Zeng;Jingyi Zhang;Fang Huang;Shiping Shan;Zhaohui Guo;Hongwei Yi;Zhiguang Sun;Jiaofeng Gu;Bohan Liao

College of Environmental Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;College of Resources and Environment,Hunan Agricultural University,Changsha 410128,China;Hunan Engineering Laboratory for Control of Rice Quality and Safety,Changsha 410004,China;Hunan Institute of Microbiology,Changsha 410009,China;Hunan Shuanghong Agricultural Ecological Engineering Co.,Ltd.,Changsha 410205,China

环境科学学报（英文版）

[1]Wenjun Yang;Shilong Wang;Hang Zhou;Min Zeng;Jingyi Zhang;Fang Huang;Shiping Shan;Zhaohui Guo;Hongwei Yi;Zhiguang Sun;Jiaofeng Gu;Bohan Liao-.Combined amendment reduces soil Cd availability and rice Cd accumulation in three consecutive rice planting seasons)[J].环境科学学报（英文版）,2022(01):141-152

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