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Influence of wastewater irrigation on environmental capacity of soil heavy metals and rice growth
Author(s): 
Pages: 124-127
Year: Issue:  3
Journal: CHINESE JOURNAL OF ECO-AGRICULTURE

Keyword:  污灌土壤污染重金属环境容量水稻;
Abstract: 对农田污灌区污水和土壤监测结果表明,土壤中Cd、As、Hg、Cu、Pb、Cr和Zn等含量为当地环境背景值的1.55~5.29倍,其中Cd和As含量分别为国家土壤环境质量2级标准的3倍和1.42倍.污水中7种重金属含量为农田灌溉水质标准的4.8~34倍,部分有机污染物含量为灌溉水质标准的1.10~1.87倍.以3级标准为最大容量限值,土壤重金属达土壤环境容量的污灌年限估算结果依次为Cr>Hg>Pb>Cu>Zn>Cd.污土清灌和污水直接灌溉均影响盆栽水稻的正常生长,其中污染土壤持续污灌可导致部分秧苗死亡.
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