农业环境科学学报2018，Vol.37Issue(4)：696-704,9.DOI:10.11654/jaes.2017-1505
生物炭耦合水分管理对稻田土壤As-Cd生物有效性及稻米累积的影响
Bioavailability of arsenic and cadmium,and their cumulative control in rice grown on arsenic-cadmium-contaminated paddy soils
摘要
Abstract
In the present study,the arsenic(As)and cadmium(Cd)-contaminated soil from a mining area of Hunan Province was collected to study the effects of different treatments(CK:wet irrigation,WF:agronomic measure flooding,ZC:bamboo charcoal,ZF:bamboo charcoal with irrigation, GC:chaff carbon, GF:chaff carbon with irrigation)on the bioavailability of As and Cd in soil and their accumulation in brown rice.The results showed that the pH increased by 0.12~0.72 units in all the six treatments,which showed an increasing trend initially,and then decreased to neutral.Compared with CK,the Eh of soil subjected to other five treatments showed a decreasing trend.However,the Eh of soil subjected to treatments ZC and GC were significantly higher than that of the treatments WF,ZF,and GF flooded with biochar dur-ing the same growth stage,and was maintained in a weak reductive state.The concentration of available Cd,acid extractables,and TCLP ex-tractables significantly decreased, while the concentration of available As and TCLP extractables significantly increased among all treat-ments.The content of Cd in brown rice subjected to the treatments WF, ZF, and GF flooded with biochar decreased by 51.46%~57.28%, and the optimal inhibition effect for Cd was achieved by the treatments GF,which was significantly different from that of ZF treatment.The content of As in the grain reached 0.29,0.32 mg·kg-1,and 0.30 mg·kg-1,39.74%~53.58% higher than that of the CK.There was no signifi-cant difference among the three groups.The content of Cd in brown rice decreased by 16.50% and 39.81%,while the content of As in brown rice increased by 27.24% and 12.23%.However,there was no significant difference between the treatment groups GC and CK.These results indicate that the treatments WF,ZF,GF,and ZC can reduce the bioavailability of Cd in soils,which will be of great significance to remedi-ate Cd-contaminated paddy soils.However,it can increase the bioavailability of As in soil.Furthermore,GC treatment with single addition of biochar can be used in Cd-As-contaminated farmland soils, to obtain information for food production on Cd-As-contaminated paddy soils.关键词
镉/砷/复合污染/竹炭/稻壳炭/淹水/稻田土壤Key words
cadmium/arsenic/combined pollution/bamboo charcoal/chaff carbon/flooding/paddy soils分类
资源环境引用本文复制引用
李园星露,叶长城,刘玉玲,杨蕊嘉,何钟响,刘孝利,铁柏清,孙健..生物炭耦合水分管理对稻田土壤As-Cd生物有效性及稻米累积的影响[J].农业环境科学学报,2018,37(4):696-704,9.基金项目
国家科技支撑计划项目(2015BAD05B02-07) （2015BAD05B02-07）
国家自然科学基金项目(41201511)The National Key Technology Research and Development Program of the Ministry of Science and Technology of China(2015BAD05B02-07) （41201511）
The National Natural Science Foundation of China(41201511) （41201511）
