| CO2浓度和温度升高对谷子各生育期土壤氧化还原酶活性的影响 |
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| 引用本文： | 王雪松,郑粉莉,王婧,焦健宇,赵苗苗,魏晗梅.CO2浓度和温度升高对谷子各生育期土壤氧化还原酶活性的影响[J].土壤通报,2021,52(5):1140-1148. |
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| 作者姓名： | 王雪松 郑粉莉 王婧 焦健宇 赵苗苗 魏晗梅 |
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| 作者单位： | 1.西北农林科技大学水土保持研究所，黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西 杨凌 712100 |
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| 基金项目： | 中国科学院国际合作局国际伙伴计划项目（161461KYSB20170013） |
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| 摘 要： | 研究CO2浓度和温度升高对作物各生育期土壤氧化还原酶活性的影响，有助于分析气候变化对土壤养分循环过程的影响。本研究结合人工气候室和盆栽控制实验，模拟3种气候情景（当前环境CO2浓度和温度、仅CO2浓度升高、CO2浓度和温度均升高）和2种水分条件（充分供水和轻度干旱），研究了谷子（Setaria italica）开花期、开花后10 d、灌浆期和收获期4个生育期土壤氧化还原酶活性对CO2浓度升高和增温的响应。结果表明，CO2浓度由400 μmol mol?1升至700 μmol mol?1显著抑制了土壤过氧化氢酶和多酚氧化酶活性，二者降幅分别为2.86% ~ 7.99%和8.63% ~ 27.00%；而温度由22 ℃增加到26 ℃显著增加了土壤过氧化氢酶和多酚氧化酶活性，二者增幅分别为2.10% ~ 9.83%和10.03% ~ 24.96%；CO2浓度升高和增温的交互作用对两种土壤酶活性的影响在谷子4个生育期均无显著影响。谷子生育期对土壤氧化还原酶活性有显著影响，CO2浓度升高与生育期的交互作用对两种土壤氧化还原酶活性均有显著影响，但增温与生育期交互作用仅对土壤多酚氧化酶活性有显著影响。冗余分析（RDA）结果显示，土壤NH4+和MBN对土壤多酚氧化酶活性的变化有较高的解释度。CO2浓度升高抑制土壤氧化还原酶活性，增温提高土壤氧化还原酶活性，两者在多数谷子生育期表现为拮抗作用；谷子生育期影响土壤氧化还原酶活性对气候变化的响应；土壤有效N含量是影响土壤多酚氧化酶活性的重要因素。
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| 关 键 词： | CO2浓度升高 增温 生育期 土壤多酚氧化酶 土壤过氧化氢酶 |
| 收稿时间： | 2021-03-18 |
Effects of CO2 and Temperature Elevation on Soil Oxidoreductase Enzyme Activities During Different Millet Growth Periods |
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| Institution: | 1.Institute of Soil and Water Conservation, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling 712100, China2.Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China |
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| Abstract: | Studying the effects of CO2 concentration and temperature elevation on soil oxidoreductase enzyme activities during different crop periods is helpful to analyze the effects of climate change on soil nutrient cycle processes. This study investigated the response of soil oxidoreductase enzyme activities to CO2 concentration increase and temperature increase at four millet (Setaria italica) growth stages, including anthesis, 10 d after anthesis, grain filling and maturity stages, respectively, by combining artificial climate chamber and pot control experiments, simulating three climate scenarios (current environmental CO2 concentration and temperature, only elevated CO2 concentration, CO2 concentration and temperature elevation) and two water conditions (adequate water supply and mild drought). The results showed that the increase of CO2 concentration from 400 to 700 μmol·mol?1 significantly inhibited soil catalase and polyphenol oxidase activities, they were respectively reduced 2.86%-7.99% and 8.63%-27.00%. Temperature increased 4 ℃ significantly promoted soil catalase and polyphenol oxidase activities, they were respectively increased 2.10%-9.83% and 10.03%-24.96%. Interaction between increased CO2 concentration and warmth had no significant effect on the activity of two soil enzymes during the four growth stages of millet. The growth periods of millet had a significant effect on soil oxidoreductase activities. Moreover, the interaction between increased CO2 concentration and growth stages had a significant effect on the soil oxidoreductase activities, but it between temperature increase and growth stages only had a significant effect on soil polyphenol oxidase activity. The results of redundant analysis (RDA) showed that soil NH4+ and MBN had high degree of explanation for changes of soil polyphenol oxidase activity. Elevated CO2 concentration inhibited soil oxidoreductase enzyme activities, while elevated temperature increased soil oxidoreductase activities. The effects of the CO2 concentration and temperature elevation on soil oxidoreductase activity presented an antagonism in most millet growth stages. Millet growth stages affected the response of soil oxidoreductase enzyme activity to climate change. Soil available N content was an important factor affecting the activity of soil polyphenol oxidase. |
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