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| DOI：10.13522/j.cnki.ggps.2025047 |
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| Biological evaluation of the feasibility of farmland irrigation with reclaimed water |
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WU Lyu, WANG Ping, YANG Xinglong, WANG Yunting, YE Qian,
CHEN Lingli, WU Xinyu, GUO Di, ZHAO Zhiqing
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1. College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China;
2. School of Petroleum and Environment Engineering, Yan’an University, Yan’an 716000, China
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| Abstract: |
| 【Objective】Reclaimed water from rural households offers a promising supplementary source for agricultural irrigation in water-scarce regions. However, its safety and ecological impacts require systematic evaluation. This study assesses the suitability of rural reclaimed water for farmland irrigation by examining its effects on seed germination and soil microbial and chemical properties.【Method】The experiment included incubation and analysis of field soil and water samples. It examined the influence of irrigation with water from different sources on seed germination of seven crops. In addition, we analysed the changes in enzymatic activity and microbial community in different treatment.【Result】Among the 13 collected water samples, pH, CODCr, and ammonia nitrogen concentrations met the Class I limits of the local rural domestic sewage discharge standard (DB33/973—2021). Concentrations of pH, CODCr, Pb, Cd, Cr??, Hg, and As also complied with the national agricultural irrigation water quality standard (GB5084—2021). Germination rates of radish, Shanghai green, and rice seeds under different irrigation sources ranged from 96.7%-100%, 85.0%-93.3%, and 88.3%-95.0%, respectively, showing no significant difference from the control. Irrigation with reclaimed water increased soil nitrate nitrogen, ammonium nitrogen, and available phosphorus contents, with nitrate nitrogen rising by 13.2%-265% compared to the control. Sucrase activity increased, while alkaline phosphatase and catalase activities decreased by 16.8%-23.9% and 22.2%-54.2%, respectively. 16S rDNA sequencing revealed a reduction in bacterial diversity but enrichment of Acidobacteriota, Bacteroidota, and beneficial taxa such as Candidatus Koribacter, Candidatus Solibacter, and Chujaibacter.【Conclusion】 Irrigation with rural reclaimed water has no significant adverse effect on seed germination and enhances soil nutrient availability and beneficial microbial abundance. For the safe and sustainable use of reclaimed water in agriculture, a multidimensional monitoring framework integrating seed viability, soil physicochemical characteristics, and microbial community dynamics is recommended to ensure soil health and crop safety. |
| Key words: rural life reclaimed water; recycle; biological assessment; soil nutrients; microbial community structure |
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