温度对土壤氧化大气CH4的影响

摘要/Abstract

摘要： 讨论了温度对土壤氧化大气CH₄的影响及其机理。当温度较低时土壤也具有一定的氧化大气CH₄的能力,两者具有很高的相关关系,但是由于CH₄氧化菌对大气CH₄具有很强的亲和力以及大气CH₄氧化所需活化能较低,因此土壤氧化大气CH₄对温度的敏感度远低于产CH₄,导致温度系数Q₁₀较小。当大气CH₄和O₂扩散进入土壤的速率等于土壤中CH₄和O₂消耗的速率时,大气CH₄氧化达到最大值,此时的土壤温度就是CH₄氧化的最佳温度。如果温度继续升高并大于最佳温度,由于CH₄氧化菌无法与利用O₂能力更强的硝化细菌和其它微生物竞争利用土壤空气中有限的O₂,使得土壤中CH₄氧化菌的繁殖和活性降低。这一作用机理的提出较好地解释了为什么随着温度升高土壤氧化大气CH₄能力呈低高低的态势。

关键词: 植酸酶, 菌种筛选, 固态发酵, 产酶条件

Abstract: The research progresses in the effects of soil temperature on atmospheric CH₄ oxidation in soils were reviewed in this paper. Atmospheric CH₄ oxidation occurs in soils even if the temperature is very low. The atmospheric CH₄ oxidation rates are highly correlated with soil temperature, but not so closely as those of CH₄ production since methanotrophs have high affinity for CH₄ and low activation energy for CH₄ oxidation. As a result, the temperature effectiveness Q₁₀ is much smaller than that of CH₄ production. When the rates of CH₄ and O₂ diffusion from the atmosphere into the soil air are equal to those of CH₄ and O₂ consumption in soils, CH₄ oxidation rates in soils reach the maximum values at a given temperature which is called the optimal one. If the temperature continually rises and is higher than the optimal temperature, the reproduction and activity of methanotrophs in soils will gradually decrease because methanotrophs fail to compete with nitrifiers and other microbes for the limited oxygen in soil air. What we have proposed as above has successfully explained why soil temperature influencing the rate of atmospheric CH₄ oxidation shows the trend of increasing at first, then reaching the maximum and at last decreasing with temperature.

Key words: Phytase, Strain screening, Solid state fermentation, Optimal conditions of phytase-producing

中图分类号:

X511

丁维新, 蔡祖聪. 温度对土壤氧化大气CH₄的影响[J]. 生态学杂志, 2003, (3): 54-58.

DING Weixin, CAI Zucong. Effect of temperature on atmospheric CH₄ oxidation in soils[J]. cje, 2003, (3): 54-58.

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温度对土壤氧化大气CH₄的影响

Effect of temperature on atmospheric CH₄ oxidation in soils

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