Effects of different irrigation levels of reclaimed water on the distribution of soil heavy metals and typical pathogenic bacteria
HAN Yang1,2, LI Ping1,3, QI Xue-bin1,3, GUO Wei1,3, CUI Bing-jian1,3, LU Hong-fei1,3
1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China;
2. Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. The Ministry of Agriculture Water Environment Factor Risk Assessment Laboratory of Agricultural Products Quality and Safety, Xinxiang 453003, China
This study aimed to discern the effect of different levels of irrigation with reclaimed water on soil heavy metals and the distribution of soil active microorganisms and typical environmental pathogenic bacteria. The effects of two irrigation water qualities (reclaimed water and tap water) and two irrigation levels (full irrigation and insufficient irrigation) on soil heavy metals and the distribution of soil active microorganisms and typical environmental pathogenic bacteria were studied through indoor soil column irrigation. Results indicated that reclaimed water irrigation increased the content of heavy metals in soil, but according to the soil environmental quality standard, soil after irrigated by reclaimed water did not exceed the standard. Therefore, reclaimed water irrigation could not cause soil heavy metals pollution. Compared with insufficient irrigation with reclaimed water, full irrigation with reclaimed water significantly increased the content of Cd and Pb in surface soil, there was no significant difference in the content of Cu and Zn. At the same irrigation level, the number of bacteria, coliform group and Escherichia coli in surface soil significantly increased with reclaimed water irrigation, there was no significant difference in the number of soil fungi at two irrigation water quality. The number of bacteria, fungi, coliform group and Escherichia coli in surface soil under full irrigation with reclaimed water was significantly higher than with insufficient irrigation using reclaimed water. There was a positive correlation between the content of heavy metals (Cd, Pb, Zn) and the quantity of bacteria and fungi, and between the content of heavy metals and the quantity of coliform group and Escherichia coli. Reclaimed water therefore promoted the reproduction of active microorganisms in surface soil, and increased the risk of soil heavy metals and environmental pathogens pollution. Reasonable irrigation with reclaimed water can therefore effectively control the content of heavy metals and the quantity of soil pathogens in soil.
韩洋, 李平, 齐学斌, 郭魏, 崔丙健, 陆红飞. 再生水灌水水平对土壤重金属及致病菌分布的影响[J]. 中国环境科学, 2019, 39(2): 723-731.
HAN Yang, LI Ping, QI Xue-bin, GUO Wei, CUI Bing-jian, LU Hong-fei. Effects of different irrigation levels of reclaimed water on the distribution of soil heavy metals and typical pathogenic bacteria. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 723-731.
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