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森林土壤甲烷(CH4)通量及主要影响因素的研究对于降低全球温室气体收支评估的不确定性具有重要价值。本研究通过室内培养实验,分析了土壤湿度、温度和氮添加对长白山3种主要林型(白桦林、山杨林和阔叶红松林)土壤甲烷通量的影响。结果表明:3种林型土壤均为甲烷汇,15d平均吸收速率分别为2.27μg·kg-1·h-1(山杨林)、1.54μg·kg-1·h-1(阔叶红松林)和1.46μg·kg-1·h-1(白桦林)。重复测量多元方差分析结果显示:林型、温度、土壤湿度及氮素处理对甲烷通量均有极显著影响(P<0.01),林型与其他因子交互作用显著;3种林型土壤甲烷吸收的最佳含水量为45%～60%;在10～20℃条件下,甲烷吸收速率随温度增加而增加;氮对甲烷吸收有明显抑制作用。
Methane (CH4) flux in forest soils and the main influencing factors are of great value in reducing the uncertainty of the assessment of global greenhouse gas revenues and expenditures. In this study, we analyzed the effects of soil moisture, temperature and nitrogen addition on soil methane flux in three main forest types (Betula platyphylla, Populus davidiana and Broad-leaved Korean pine forests) in Changbai Mountain. The results showed that all the three kinds of forest soils were methane and the average absorption rates of 15 days were 2.27 μg · kg-1 · h-1 (Populus davidiana) and 1.54 μg · kg-1 · h-1 ) And 1.46μg · kg-1 · h-1 (birch forest). Multivariate ANOVA results of repeated measurements showed that the forest type, temperature, soil moisture and nitrogen treatment had a significant impact on methane fluxes (P <0.01), and the interaction between forest types and other factors was significant. The methane uptake by three forest types The optimum moisture content is 45% -60%. Under the condition of 10 ~ 20 ℃, the methane absorption rate increases with the increase of temperature, and nitrogen can obviously inhibit the methane absorption.