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| Effects of different water treatments on soil enzyme activities in paddy fields in central China |
| Received:June 17, 2021 |
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| KeyWord:peroxidase;phenolic oxidase;soil moisture;phenolic substance;dissolved organic carbon |
| Author Name | Affiliation | E-mail | | YAN Ziwei | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | GAO Jingyun | Tianjin Ecological Environment Monitoring Center, Tianjin 300191, China | | | ZHANG Xiuling | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | DU Lijun | Hebei Vocational College of Tourism, Chengde 067000, China | | | XU Han | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | WANG Xi | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Lan | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | LIN Shan | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Ronggui | Key Laboratory of Cultivated Land Conservation in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | rghu@mail.hzau.edu.cn |
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| Abstract: |
| This study aims to explore the effects of different soil moistures on soil enzyme activity relevant to soil carbon conversion. Paddy soils from Xianning(Hubei Province), and Changsha(Hunan Province), were used as research subjects. In an indoor cultivation experiment, we examined the effects of four soil moisture levels[40%, 70%, 100%, and 200% water holding capacity(WHC)] on soil peroxidase and phenol oxidase activity, content of phenolic substances, and change in dissolved organic carbon(DOC). Enzyme activities in Xianning soil were higher than those in Changsha soil. Phenol oxidase and peroxidase activities increased in both soils with increasing soil moisture. Phenolic substance content in the soil displayed a dynamic equilibrium with culture time, and was highest at 40% WHC and lowest at 200% WHC. Soil DOC content increased with elevated(100%WHC, 200%WHC) soil moisture, and decreased with low (40%WHC, 70%WHC)soil moisture. Phenol oxidase activity was initially low, and reached higher values between the 5th and 15th day of the experiment. The highest value in Xianning rice soil was 260.76 nmol·g-1·h-1, and that of Changsha rice soil was 107.10 nmol·g-1·h-1. Peroxidase activity was higher in later culture stages under high soil moisture(200%WHC). The highest value reached was 929.66 nmol· g-1 · h-1. Soil DOC content significantly positively correlated with peroxidase and phenolic oxidase activities, and with soil moisture. Phenolic content was significantly positively correlated with peroxidase and phenolic oxidase activities. Phenol oxidase and peroxidase correlated positively with soil moisture. Correlation analysis showed that the content of DOC was significantly positively correlated with the activities of peroxidase, phenoloxidase and soil moisture. The results showed that the activities of phenoloxidase, peroxidase and phenolics in soil with high organic matter content were significantly higher than those in soil with low organic matter content. Higher soil moisture (100%WHC, 200%WHC) significantly increased the activity of phenol oxidase and peroxidase in soil, and the content of phenolic substances and DOC in soil was higher under higher soil moisture. |
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