Screening and rotating winter and summer crops to effectively remediate Cd-contaminated agricultural land and ensure safe production  

作　　者：Wenjun Yang Yixuan Chen Xiao Deng Pengfei Tu Kefu Tan Zhaoyue Liu Qingru Zeng Yang Yang 

机构地区：[1]College of Environment&Ecology,Hunan Agricultural University,Changsha 410128,China

出　　处：《Frontiers of Environmental Science & Engineering》2025年第3期191-207,共17页环境科学与工程前沿(英文)

基　　金：supported by the National Natural Science Foundation of China(Nos.U20A20108 and 41701366).

摘　　要：Most hyperaccumulator and economic crops do not grow year-round,leading to limited remediation efficiency.Implementing year-round rotation patterns with known and potential hyperaccumulators or economic crops can improve remediation efficiency.This study evaluated the remediation efficiency and agricultural safety of 10 winter crops and 12 summer crops in field-scale trials.Sedum alfredii Hance(SA)and Cichorium intybus L.(CI)exhibited the highest cadmium(Cd)accumulation among winter crops,reducing soil Cd content by 12.1%and 10.4%,respectively.Helianthus annuus Linn.(HA)was the most effective summer crop,reducing soil Cd content by 3.7%.The vegetable oils of all oil crops were within safe heavy metal limits,whereas the edible parts of other economic crops exceeded Cd limits.A combination of the best winter and summer crops was chosen to comprehensively evaluate the remediation efficiency and economic benefits of three rotation patterns:SA+HA,CI+HA,and Linum usitatissimum L.(LU)+HA.SA+HA and CI+HA were more effective than LU+HA,reducing soil Cd by 12.5%,8.9%,and 3.7%,respectively.The net profits were−27591.19,749.50,and 3309.76 US$/ha,respectively.Overall,CI+HA demonstrated the highest combined capacity(comprehensive index=1.79)for both remediation efficiency and economic benefits,achieving safe production and effective restoration of Cd-contaminated agricultural land.However,the accumulation of heavy metals in oilseed meals warrants further attention.

关 键 词：Cadmium(Cd) Cost-benefit analysis Crop rotation PHYTOEXTRACTION Risk assessment 

分 类 号：X53[环境科学与工程—环境工程]