The long-term effectiveness of ferromanganese biochar in soil Cd stabilization and reduction of Cd bioaccumulation in rice  

作　　者：Yuling Liu Haiyan Luo Boqing Tie Danyang Li Shoutao Liu Ming Lei Huihui Du 

机构地区：[1]Hunan Engineering&Technology Research Center for Irrigation Water Purification,College of Resources and Environment,Hunan Agricultural University,Changsha 410128,People’s Republic of China [2]Key Laboratory of Southern Farmland Pollution Prevention and Control,Ministry of Agriculture,Changsha 410128,China [3]Hunan Institute of Agro-Environment and Ecology,Changsha 410128,China

出　　处：《Biochar》2021年第4期499-509,共11页生物炭（英文）

基　　金：This work was financially supported by the National Key Research and Development Program of China(2017YFD0801505);National Natural Science Foundation of China(NSFC)(No.41907015);China Postdoctoral Science Foundation(2019M662782);Scientific Research Fund of Hunan Provincial Education Department,China(18B120).

摘　　要：The application of Fe-Mn-modified biochar for the remediation of Cd-contaminated soil over long time periods has been little studied.In this paper,we describe the performance of coconut-shell-derived biochar modified with ferromanganese in relation to soil Cd stabilization and rice Cd bioaccumulation during a 3-year laboratory study.Different application dosages(0.05-0.5 wt%)and different rice varieties(the early and late rice)are also considered.The results show that ferromanganese is mainly loaded in biochar pores as MnFe_(2)O_(4),and that it decreases the specific surface area(SSA)and total pore volume of biochar.Ferromanganese biochar(0.5 wt%)applied to paddy soil is more effective than the same dose of pristine biochar in decreasing the soil-exchangeable Cd fraction(27.42-41.92%vs 22.56-33.85%),predominantly by decreasing soil Eh and increasing root Fe plaques.Ferromanganese biochar application helps to reduce Cd bioaccumulation in rice,especially in the grain(up to 48.6%-61.0%),and grain Cd levels(0.2 mg/kg)are all within the acceptable limit for food security in China.It is shown that ferromanganese modification and application can maintain soil at low redox status,keep root Fe plaques at a high level,and may also increase the stability of pristine biochar.All of these effects contribute to maintaining its high remediation efficiency over a 3-year inoculation period.The results presented in this paper demonstrate the potential appli-cations of ferromanganese biochar in soil remediation and the improvement of food safety.

关 键 词：BIOCHAR FERROMANGANESE Modification CADMIUM STABILIZATION 

分 类 号：S15[农业科学—土壤学] S511[农业科学—农业基础科学]