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| Short-term effects of reclaimed blackwater irrigation on fluvo-aquic soil quality and leafy vegetable growth |
| Received:March 25, 2025 |
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| KeyWord:black ash separation;agricultural irrigation;soil fertility;microbial diversity;crop growth |
| Author Name | Affiliation | E-mail | | SUN Zihuan | East China Normal University, School of Ecological and Environmental Sciences, Shanghai 200241, China | | | GU Jiayan | East China Normal University, School of Ecological and Environmental Sciences, Shanghai 200241, China | | | HE Guofu | East China Normal University, School of Ecological and Environmental Sciences, Shanghai 200241, China
Chongming Ecological Research Institute, Shanghai 200062, China
Shanghai Engineering Technology Research Center for Biological Transformation of Organic Solid Waste, Shanghai 200241, China | gfhe@des.ecnu.edu.cn | | CHEN Min | Shanghai Energy Conservation and Emission Reduction Center Co., Ltd., Shanghai 200232, China | | | LIU Jiajun | East China Normal University, School of Ecological and Environmental Sciences, Shanghai 200241, China | | | ZHAO Xiaoqi | East China Normal University, School of Ecological and Environmental Sciences, Shanghai 200241, China | |
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| Abstract: |
| In order to investigate the effects of recycled blackwater（RBW）on soil quality and crop growth in agricultural irrigation, three types of crops, namely amaranth, water spinach, and bok choy, were irrigated with blackwater that was treated through 45-day anaerobic digestion. Two irrigation treatments were set：RBW1（50%）and RBW2（100%）, using CK（clean water）as the control. The results showed that, compared with the CK treatment, RBW treatments increased comprehensive soil fertility by 1.85%-31.52%, with RBW2 exhibiting higher soil fertility. The soil α-diversity index of the soil bacterial community showed no significant differences（P>0.05）, and the dominant phyla（Proteobacteria, Chloroflexi, Actinobacteriota, Acidobacteriota） remained unchanged. Crop height, root length, fresh weight, dry weight, and soluble sugar content increased under RBW treatments, with RBW2 outperforming RBW1. Although vitamin C（VC） content decreased by 14.63%-62.36%, all values remained above 1 mg·g-1, indicating that the crops still retained high VC levels. The results showed that the use of RBW as supplemental water can improve soil fertility, maintain microbial diversity and promote crop growth, which provides a scientific basis for exploring the safe and efficient resource utilization of recycled black water, and is in line with China ′s sustainable development strategy. |
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