| Effects of straw returning and biogas slurry combined application on salinized soil nutrients and enzyme activities |
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| DOI：10.7606/j.issn.1000-7601.2024.04.13 |
| Key Words: straw return biogas slurry soil nutrient content soil enzyme activity cotton field in southern Xinjiang |
| Author Name | Affiliation | | YAO Yingshang | College of Agriculture, Tarim University, Alar, Xinjiang 843300, China | | SUN Xiaolei | Aksu Ecological Environment Monitoring Station of Xinjiang Uygur Autonomous Region, Aksu, Xinjiang 843000, China | | LIU Weiyang | College of Agriculture, Tarim University, Alar, Xinjiang 843300, China | | YOU Yongjun | College of Water Resources and Architectural Engineering, Tarim University, Alar, Xinjiang 843300, China | | LI Fayong | College of Water Resources and Architectural Engineering, Tarim University, Alar, Xinjiang 843300, China |
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| Abstract: |
| To provide a reference for the efficient decomposition of cotton straw in saline environments and the rational utilization of biogas slurry in southern Xinjiang, a 120-day indoor cultivation experiment was conducted in 2023. Five treatments were set up, including cotton stem full return (AS), low amount of biogas slurry (LB), high amount of biogas slurry (HB), cotton stem return with low amount of biogas slurry (AS+LB), and cotton stem return with high amount of biogas slurry (AS+HB). Destructive sampling was conducted on days 3, 6, 10, 20, 30, 40, 60, 80, 100, and 120, respectively to analyze the changes in the main physicochemical factors and key enzyme activities of soil under different treatments. The results showed that the soil organic matter treated with biogas slurry showed two stages: rapid increase (0~10 days) and slow accumulation (>10 days). Compared with cotton stem full return treatment， high amount biogas slurry application increased soil organic matter, total nitrogen, available phosphorus, and available potassium by 25.15%, 35.26%, 79.25%, and 66.90%, respectively. At the same time, it increased soil catalase, alkaline phosphatase, and sucrase activities by 90.67%, 66.54%, and 44.25%, respectively, and it also improved soil electric conductivity. Redundancy analysis (RDA) revealed that soil organic matter was the main controlling factor for soil enzyme activity changes, explaining 54.30% of variance variation. Therefore, the combination of straw returning and biogas slurry application accelerated the decomposition of cotton straw, increased the organic matter and total nitrogen contents of saline soil in cotton fields, and promoted the increase of enzyme activity. However, excessive biogas slurry application might increase the risk of soil salinization. |
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