污灌对土壤重金属环境容量及水稻生长的影响研究

Influence of wastewater irrigation on environmental capacity of soil heavy metals and rice growth

  • 摘要: 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CA和A5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>CA 。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。

     

    Abstract: The pollution status of soils and wastewater were studied in cultivated fields.The results show that the soil contents of CA ,As ,Hg,Cu,Pb,Cr and Zn are 1.55~5.29 times of those of the background values,an d those of Cd and As are up to 3 and 1.42 times of the environmental quality standard values of the second leve1.The heavy metal contents in wastewater are 4.8 to 34 times of the standard values for irrigation water quality,and the contents of some organic pollutants&re also higher than those of the standard.If thinking the third level standard values of environmental capacity as the maxirnum limitation,the sequence of heavy metals reaching the limitation of wastewater irrigation years is Cr> Hg>Pb>Cu>Zn>CA .Both polluted soil irrigated by natura1.water and unpolluted soil irrigated by wastewater will Mfeet the rice growth,and polluted soil irrigated by wastewater can lead to the death of some rice seedlings.

     

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