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	Effects of Biochar and Lime Application on Soluble Cd, Pb, As Release and Non-point Loads of Rice Agroecosystem by in Situ Field Experiment, Central Hunan Province Mining Area
	Liu, Xiaoli; Zeng, Zhaoxia; Tie, Baiqing; Chen, Qiuwen; Chen, Zhe; Zheng, Ruilun
	2013
会议名称	35th World Congress of the International-Association-for-Hydro-Environment-Engineering-and-Research (IAHR)
会议日期	SEP 08-13, 2013
会议地点	Chengdu, PEOPLES R CHINA
关键词	Paddy rice Biochar lime Heavy metal non-point load Hunan province mining area
英文摘要	Biochar and lime has attracted tremendous research interests due to its ability of increasing some toxic heavy metal irons immobilization in soil. However, few studies focus on the effects of biochar and lime application on soluble heavy metal release from historically heavy metal contaminated soil to waterlogged paddy water and non-point loads with in situ field experiment. Two years study was conducted to evaluate Cd, Pb, As metal irons immobilization and non-point loads reduction effectiveness after rice, bean derived biochars and lime application into a historically multi-metal contaminated soil by in situ field experiment, in central Hunan province mining area. Results showed that, additions of biochar derived from rice and bean straw (20 t.hm(-2)) significantly increased soil pH by 0.6-1.1 units, while lime application (50kg.hm(-2)) has no obvious effect on pH. Rice biochar addition reduced soluble Cd, Pb concentration of paddy waterlogged water by 56-80%, 60-85% respectively, and bean biochar addition also caused soluble Cd, Pb reduction by 61-83%, 51-86% respectively, compared to control treatment. No obvious reduction efficiency of soluble Cd, Pb, As of paddy waterlogged water was observed after lime application comparing to control. However, rice and bean biochar addition obviously increased the soluble As concentration of paddy waterlogged water by30-84% and 19-84% respectively, but not for lime. Both rice and bean biochar application can significantly decreased non-point loads of Cd and Pb during natural rainfall runoff events, but significantly increased As non-point load than control and lime application, which maybe will cause potential water environment risk due to much soluble As irons release into aqueous phase.
内容类型	会议论文
源URL	[http://ir.rcees.ac.cn/handle/311016/24580]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Liu, Xiaoli,Zeng, Zhaoxia,Tie, Baiqing,et al. Effects of Biochar and Lime Application on Soluble Cd, Pb, As Release and Non-point Loads of Rice Agroecosystem by in Situ Field Experiment, Central Hunan Province Mining Area[C]. 见:35th World Congress of the International-Association-for-Hydro-Environment-Engineering-and-Research (IAHR). Chengdu, PEOPLES R CHINA. SEP 08-13, 2013.

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