水利学报Issue(6)：682-690,9.DOI:10.13243/j.cnki.slxb.2014.06.007
生物炭与石灰添加对稻田土壤重金属面源负荷影响
Effects of biochar and lime additives on non-point load of heavy metals in paddy soil
摘要
Abstract
Owing to the strong ability to immobilize some toxic heavy metals immobilization in contaminated soils,biochar and lime received increasing interests from the community of soil remediation and crops safe⁃ty in recent years. This study conducted a two-year in situ field experiment in a paddy soil which had been contaminated by complex heavy metals,in Hunan province,China. The objective is to investigate the effects of different treatments of biochars and lime additives on the solution and non-pointe load of Cd, Pb,Zn. The additive rate was 20 t/hm2 for biochars and 750 kg/hm2 for lime. The results show that rice bio⁃char additive evidently reduced soluble Cd, Pb, Zn concentrations in waterlogged paddy by 56 %~80 %, 60 %~75 %, 63 %~90 % respectively, and bean biochar additive reduced soluble Cd, Pb, Zn concentra⁃tions by 61%~83%,51%~76% and 55%~80% respectively,comparing to the control treatment. No ob⁃vious changes of soluble Cd, Pb, Zn, As concentrations was observed in the treatment of lime application compared to the control treatment. However,both rice and bean biochar additives significantly increased sol⁃uble metalloid As concentrations in waterlogged paddy,compared to the lime additive and the control treat⁃ments. In conclusion, both rice and bean biochar applications could significantly decrease the non-point load of Cd, Pb and Zn during rainfall events, while increase the non-point load of metalloid As, leading to higher risk of As contamination of the receiving water. No obvious seasonality of non-point load of Cd, Pb,Zn and As was observed in this study,which may be due to the large variation of precipitation.关键词
生物炭/石灰/稻田/重金属/面源输出负荷Key words
biochar/lime/paddy field/heavy metal/non-point source loading分类
资源环境引用本文复制引用
刘孝利,曾昭霞,陈求稳,邹慧玲..生物炭与石灰添加对稻田土壤重金属面源负荷影响[J].水利学报,2014,(6):682-690,9.基金项目
国家自然科学基金（51279196；31100329）；青年基金（41201511）；国家重大水专项 （）
