AI Article Synopsis
- Wastewater irrigation provides an alternative to freshwater for agriculture, but its long-term effects on soil electron transfer capacity (ETC) remain unclear.
- This study investigated how different durations of wastewater irrigation affected the electron-accepting capacity (EAC) and electron-donating capacity (EDC) of soil humic substances (HS), revealing a significant increase in EAC for humic acid (HA) and fulvic acid (FA) with longer irrigation duration.
- The research highlights that while EAC rose, EDC decreased for both HA and FA, indicating complex interactions between soil organic matter and microbial activities influenced by wastewater irrigation, ultimately affecting nutrient cycling in the soil.
Article Abstract
Wastewater irrigation is used to supplement agricultural irrigation because of its benefits and freshwater resource scarcity. However, whether wastewater irrigation for many years affects the electron transfer capacity (ETC) of natural organic matter in soil remains unclear, and organic matter could influence the decomposition and mineralization of substances with redox characteristics in soil through electron transfer, ultimately affecting the soil environment. The composition of soil humic substances (HS) is highly complex, and the effects of soil humic acid (HA) and fulvic acid (FA) on ETC is poorly understood. In this study, we separately evaluated the responses of the electron-accepting capacity (EAC) and electron-donating capacity (EDC) of soil HA and FA in agricultural fields to various durations of wastewater irrigation. Results showed that the EAC of HA and FA increased significantly with increasing the duration of wastewater irrigation. When wastewater irrigation lasted for 56 years, the EAC of HA showed a higher increment (590 %) than that of FA (223 %). The EDC of soil HA and FA, conversely, decreased compared to the control, with the highest reduction of 35.6 % for HA and 65.9 % for FA. Specifically, the EDC of HA gradually decreased starting from 29 years of wastewater irrigation, whereas the decrease in the EDC of FA exhibited no clear pattern in relation to the duration of wastewater irrigation. Increased soil organic matter and total nitrogen content under long-term wastewater irrigation led to an increase in sucrase and phosphatase activities, along with an increase in EAC and a decrease in EDC of HS. This suggests that soil enzyme activities may ultimately lead to changes in ETC. The results of this research provide practical insights into the redox system in soil and its driving role in soil organic matter transformation and nutrient cycling under wastewater irrigation.
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| http://dx.doi.org/10.1016/j.scitotenv.2024.173114 | DOI Listing |
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