| 不同水分处理对华中地区稻田土壤酶活性的影响 |
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| 引用本文： | 鄢紫薇,高璟赟,张秀玲,杜丽君,徐晗,王玺,胡岚,林杉,胡荣桂.不同水分处理对华中地区稻田土壤酶活性的影响[J].农业环境科学学报,2022,41(1):91-98. |
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| 作者姓名： | 鄢紫薇 高璟赟 张秀玲 杜丽君 徐晗 王玺 胡岚 林杉 胡荣桂 |
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| 作者单位： | 华中农业大学资源与环境学院,农业部长江中下游耕地保育重点实验室,武汉 430070;天津市生态环境监测中心,天津300191;河北旅游职业学院,河北 承德 067000 |
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| 基金项目： | 武汉市应用基础前沿项目（2020020601012284） |
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| 摘 要： | 为探究不同水分处理对土壤碳转化相关酶活性的影响,以湖北咸宁和湖南长沙的稻田土为研究对象,通过室内培养试验,研究了4种土壤含水率,即40%、70%、100%和200%田间持水量(WHC)下土壤过氧化物酶、酚氧化酶活性以及酚类物质和可溶性有机碳(DOC)含量的变化。结果表明:咸宁土壤的酶活性高于长沙土壤,两种土壤酚氧化酶活性和过氧化物酶活性均随水分含量的增加而增加,土壤酚类物质含量随培养时间总体呈动态平衡,在40%WHC下最高,而在200%WHC下最低;土壤DOC含量在较高(100%WHC、200%WHC)含水率下较高,而在较低(40%WHC、70%WHC)含水率下较低。酚氧化酶活性在培养前期较低,在培养的第5~15 d较高,咸宁水稻土最高值为260.76nmol·g-1·h-1,长沙水稻土为107.10 nmol·g-1·h-1。较高水分处理(200%WHC)下,过氧化物酶活性在培养后期活性较高,最高值达到929.66 nmol·g-1·h-1。相关性分析表明,DOC含量与过氧化物酶活性、酚氧化酶活性、含水率呈极显著正相关,结果表明有机质含量高的土壤酚氧化酶活性、过氧化物酶活性、酚类物质含量均显著高于有机质低的土壤。较高含水率(100%WHC、200%WHC)可显著提高土壤的酚氧化酶活性和过氧化物酶活性,且在较高含水率条件下土壤酚类物质含量和DOC含量均较高。
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| 关 键 词： | 过氧化物酶 酚氧化酶 含水率 酚类物质 可溶性有机碳 |
| 收稿时间： | 2021/6/17 0:00:00 |
Effects of different water treatments on soil enzyme activities in paddy fields in central China |
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| YAN Ziwei,GAO Jingyun,ZHANG Xiuling,DU Lijun,XU Han,WANG Xi,HU Lan,LIN Shan,HU Ronggui.Effects of different water treatments on soil enzyme activities in paddy fields in central China[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2022,41(1):91-98. |
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| Authors: | YAN Ziwei GAO Jingyun ZHANG Xiuling DU Lijun XU Han WANG Xi HU Lan LIN Shan HU Ronggui |
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| Institution: | 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;Tianjin Ecological Environment Monitoring Center, Tianjin 300191, China;Hebei Vocational College of Tourism, Chengde 067000, China |
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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 levels40%, 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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| Keywords: | peroxidase phenolic oxidase soil moisture phenolic substance dissolved organic carbon |
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