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期 刊 ：植物研究 2015年 35卷 3期 页码：384-390

关键词：枫桦次生林；原始阔叶红松林；土壤呼吸；地下碳分配；

Keywords:Betula costata secondary forest, mixed broadleaved Korean pine forest, soil respiration, belowground carbon allocation,

摘 要 ：森林土壤呼吸速率和地下碳分配是森林碳平衡的两个重要分量。本研究选择枫桦次生林和原始阔叶红松林为研究对象，测定其土壤呼吸速率和地下碳分配以及相关的环境因子。研究结果表明，生长季内枫桦次生林的土壤呼吸速率的平均值略高于原始阔叶红松林,分别为5.52和5.43 μmol·m^-2·s^-1。土壤温度是造成土壤呼吸速率季节性变化的主要影响因子，可以分别解释两种林型土壤呼吸速率的77%和81%变异。枫桦次生林和原始阔叶红松林的Q₁₀值分别为2.74和2.23。枫桦次生林的土壤呼吸年通量为9.66 tC·hm^-2·a^-1，略高于原始阔叶红松林的9.37 tC·hm^-2·a^-1。枫桦次生林和原始阔叶红松林的地下碳分配量分别为7.73和7.56 t·hm^-2·a^-1。

Abstract:Soil respiration and total belowground carbon allocation are two most important carbon fluxes of forest ecosystems. We measured them in Betula costata secondary forest and mixed broadleaved Korean pine forest. The mean soil respiration of B.costata secondary forest was higher than that of the mixed broadleaved Korean pine forest in the growing season（5.52 and 5.43 μmol·m^-2·s^-1）. The seasonality of soil respiration was driven mainly by soil temperature, which led to 77% and 81% of the variation of soil respiration in B.costata secondary forest and mixed broadleaved Korean pine forest, respectively. Q₁₀ was 2.74 and 2.23, for two-type forest, respectively. The annual flux of soil respiration and total belowground carbon allocation in B.costata secondary forest were both higher than those in mixed broadleaved Korean pine forest.

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