中文摘要：

为了解林窗对川西亚高山粗枝云杉（Picea asperata）人工林土壤呼吸的影响，采用CO2通量全自动监测系统对川西亚高山粗枝云杉人工林林窗和林内土壤呼吸及土壤温度、水分进行为期两年的连续观测，比较分析林窗和林内环境因子和土壤呼吸速率的变化. 结果表明：川西亚高山粗枝云杉人工林林窗和林内的土壤温度、土壤水分和土壤呼吸速率均具有显著的季节动态. 在生长季节（4-10月），林窗效应使土壤温度、土壤水分和土壤呼吸速率较林内分别增加了48.8%、19.3%和18.6%；而冬季（11月-翌年3月）两种环境之间并无显著差异. 林窗和林内土壤呼吸速率和土壤温度均呈显著指数相关（P 〈 0.01），与土壤水分呈显著线性相关（P 〈 0.05）. 林窗和林内的土壤呼吸温度敏感性（Q10）分别为2.46和3.01. 综上所述，林窗效应对川西亚高山森林土壤呼吸具有显著刺激作用，且有明显的季节动态特征.

英文摘要：

To understand the effect of artificial forest gap on soil respiration of subalpine Picea asperata plantation, a two-year experiment was conducted in a subalpine artificial P. asperata plantation of western Sichuan. Soil respiration and soil temperature and moisture were monitored continuously for two years by Li-cor 8100. Soil respiration rate in the forest gap and the enclosed forest exhibited a similar seasonal dynamic pattern. Soil respiration rate ranged from 0.18 μmol m-2 s-1 to 6.86 μmol m-2 s-1 in the forest gap and from 0.28 μmol m-2 s-1 to 5.54 μmol m-2 s-1 in the enclosed forest. During the growing season, compared with that of the enclosed forest, soil temperature, moisture and soil respiration rate was 48.8%, 19.3% and 18.6%, respectively, higher in the gap. However, there were no significant differences for those during the wintertime. Soil respiration rate had a significantly exponential correlation with soil temperature and a linear correlation with soil moisture. The temperature sensitivity （Q10） of soil respiration was 2.46 in the gap and 3.01 in the enclosed forest. In conclusion, forest gaps have positive effects on soil temperature, moisture and respiration rate, and such gap effects are dependent on the season.