中文摘要：

以采伐强度为25％和50％伐后5、10、20和30a的兴安落叶松林为研究对象，利用红外气体分析法研究分解初期兴安落叶松呼吸季节动态变化。结果表明：采伐对粗木质残体呼吸具有加强效果。同时采伐强度为50％的各个试验样地呼吸值均较高。采伐强度50％伐后10a的兴安落叶松林呼吸强度最大5．75μmol·m-2·s-1．而强度50％伐后30a的兴安落叶松林呼吸强度最小是0．33μmol·m-2·s-1。在季节动态中各强度的干扰下基本上保持相同的季节动态，呈单峰曲线格局，波峰7—8月。Q10值波动在3．97（强度25％，伐后10a）-1．70（强度25％伐后20a），平均值2．52。

英文摘要：

With the cutting Larix gmelinii from harvesting intensity in 25% and 50% after 10, 20 and 30 years, we used the in- frared gas analysis method to study the early seasonal respiration dynamics of coarse woody debris of Larix gmelini. The cutting can strengthen the respiration. But the respiration in the forest with logging intensity of 50% are higher. The respi- ration in the forest with logging intensity of 50% cut before 10 years is the maximum of 5.75 μmol · m-2 · s-1 , and the respiration in the forest with 50% cutting intensity cut before 30 years is the minimum of 0.33 μmol · m-2 · s-1 . The res- piration shows unimodal curve pattern and peaks from July to August. Ql0 value varies from 3.97 （ longing intensity of 25%, 10 years after cutting） to 1.70 （logging intensity of 25%, 10 years after cutting） with the average of 2.52.