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| Effects of domestic sewage tail water reuse on soil microbial biomass carbon and nitrogen contents and soil enzyme activities in paddy fields |
| Received:April 15, 2022 |
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| KeyWord:domestic sewage tail water;irrigation;soil microbial biomass carbon;soil microbial biomass nitrogen;soil enzyme activity |
| Author Name | Affiliation | E-mail | | MA Rulong | College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Hohhot 010018, China | | | DUAN Jingjing | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | duanjingjing_23@163.com | | YU Jianguang | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XUE Lihong | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SUO Quanyi | College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Hohhot 010018, China | paul98@sina.com | | YANG Linzhang | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Field experiments were conducted to explore the changes in the microbial biomass carbon and nitrogen contents and enzyme activities in paddy field soil after the reuse of rural domestic sewage tail water. The effects of combined applications of tail water and nitrogen fertilizer on the soil microbial biomass carbon and nitrogen contents, soil enzyme（urease, phosphatase, nitrate reductase, catalase, and sucrase）activities, and soil nutrients in paddy fields were investigated, with no fertilization and conventional fertilization under pond water irrigation used as the control. The results showed that the application of tillering fertilizer, conventional fertilization, or nitrogen reduction fertilization under tail water reclamation increased the soil microbial biomass carbon content by 28.75%-34.75% and 14.43%- 23.63%, and the nitrogen content by 7.10%-16.04% and 15.9%-46.88%, in 2019 and 2021, respectively, relative to the contents in the soil. During these two years, the urease activity increased by 34.92%-51.61% and 0.98%-2.94%, respectively, and the organic matter by 1.11%-11.10% and 6.38%-11.40%, respectively, under tail water irrigation treatment. Although the organic matter content in the waterirrigated soils generally presented an upward trend, the increase was greater in soils irrigated with tail water. In summary, the contents of soil organic matter and microbial biomass carbon and nitrogen and the urease activity in the paddy fields were increased by tail water irrigation, indicating that the reuse of tail water could increase soil fertility to a certain extent and plays a role in soil improvement. However, the environmental safety of the long-term reuse of tail water in the paddy field needs to be determined with further experiments. |
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