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作 者 ：王娓,郭继勋

期 刊 ：生态学报 2002年 22卷 5期 页码：655~660

关键词：羊草群落；土壤呼吸；枯枝落叶分解；

Keywords:Lymus chinensis community, soil respiration, litter decomposition,

摘 要 ：根据静态气室法的测量结果 ,分析了羊草群落土壤呼吸量和枯枝落叶分解释放 CO2 量的季节动态 ,及其与地上生物量 ,枯枝落叶分解量及环境因子的关系。结果表明 :( 1 )在整个观测期内 ,羊草群落土壤呼吸的季节动态呈现单峰曲线 ,8月中旬达到最大值 1 3.2 7g C/( m2 · d)。 ( 2 )羊草群落土壤呼吸的季节变化规律与地上绿色体生物量的季节动态同步。( 3)羊草群落土壤呼吸的季节动态与枯枝落叶分解量的季节动态同步。 ( 4 )羊草群落土壤呼吸量与土壤 0～ 1 0 cm土壤含水量显著正相关。( 5 )地表枯枝落叶层直接排放 CO2 量的季节动态呈现逐渐递减的趋势 ,释放量平均为 -0 .87g C/( m2·d)。有减缓土壤向大气排放 CO2 的作用。 ( 6 )枯枝落叶分解释放 CO2 量同地表枯枝落叶量显著正相关。

Abstract:This paper analyzed seasonal dynamics of soil respiration and CO 2 release rate of litter decomposition through alkaline absorption methods in Lymus chinensis community and the relationship between soil respiration and aboveground biomass, litter decomposition rate and environmental factors. The relationship between CO 2 release rate of litter decomposition and environmental factors were also discussed. The results were showed as followed: (1) The seasonal dynamics of soil respiration showed a single-peak...

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