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| Effects of different treatment levels of sewage on bacterial community structure and enzyme activity |
| Received:February 15, 2020 |
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| KeyWord:wastewater;treatment intensity;irrigation;fertilization level;bacteria;enzyme activity |
| Author Name | Affiliation | E-mail | | WU Xiao-fei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HE Yuan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Zhi-ping | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | bjhuangzp@126.com | | ZHANG Dan-dan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHENG Hong-yan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DING Jian | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| In order to determine a sewage treatment gradient suitable for the utilization of rural domestic sewage resources, indoor pot experiments was used to design four sewage treatment gradients including domestic sewage raw water, anaerobic effluent, contact oxidized effluent and tail water to irrigate Zizania latifolia and rice, and the effects of different treatment gradients of domestic sewage on the soil bacterial community structure and enzyme activity were studied. The results showed that sewage irrigation with different treatment gradients had no significant effect on the diversity of the soil bacterial communities, and reducing fertilization could increase the diversity of the bacterial communities. Sewage irrigation had a significant influence on the dominant species of soil bacteria at the phylum level. Compared with the control group, the gradient of sewage treatment had a positive correlation with Proteobacteria, the relative abundance of Actinomycetes in soil increased by 16.74% to 95.90%, and the relative abundance of Acidobacteria decreased by 9.57% to 47.38%. Sewage irrigation promoted the activity of alkaline phosphatase and sucrase, and the improvement rates were 11.67%~55.60% and 11.36%~156.66%, respectively. Urease activity in unfertilized soil increased by 10.45%~25.88%, and contact oxidized effluent reduced the urease activity by 25.84%. Other treatments had no significant effect on the urease activity in fertilized soil. Under the same irrigation condition, the activity of the three enzymes in the unfertilized soil was greater than that in the fertilized soil. The results showed that fertilizer had a significant effect on the soil bacterial community structure and enzyme activity. Different treatment gradients had no significant effect on the soil bacterial diversity, but significantly affected the soil enzyme activity and relative abundance of dominant species in each phylum. |
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