中文摘要：

2006年5—10月，使用Li-6400-09土壤呼吸系统测定了黑龙江省帽儿山地区温带次生林转化为落叶松人工林后土壤呼吸速率（Rs）的变化．结果表明：次生林与落叶松人工林土壤呼吸速率的日变化均呈单峰型曲线，与地温的日变化趋势相似．测定期间内，次生林和落叶松人工林Rs的变化范围分别为0．43～7．26μmol CO2·m^-2·s^-1和0．63～4．70μmol CO2·m^-2·s^-1,最大值出现在7—8月，最小值出现在10月.5-8月，次生林的Rs明显高于落叶松人工林．次生林和落叶松人工林枯落物层呼吸速率的季节变化范围分别为-0．65～1．26μmol CO2·m^-2·s^-1和-0．43～0．47μmol CO2·m^-2·s^-1．两林分中的Rs与土壤温度均呈明显的指数相关，且与5cm深地温相关最紧密．用5cm地温估算的次生林和落叶松人工林Q10分别为3．61和3．07．次生林的Rs与10—20cm土壤含水率相关显著，而落叶松人工林的Rs与土壤含水率无明显相关．

英文摘要：

With Li-6400-09 chamber, the soil respiration rate in adjacent stands of temperate secondary forest and Larix gmelinii plantation in Maoershan Mountain of Heilongjiang Province was measured from May to October, 2006. The results showed that similar to the variation of soil temperature, the daily pattern of soil respiration could be expressed as a one-humped curve. Over the study period, soil respiration rate varied from 0. 43 to 7.26 μmol CO2·m^-2·s^-1 in secondary forest, and from 0. 63 to 4. 70 μmol CO2·m^-2·s^-1in L. gmelinii plantation. The maximum soil respiration rate occurred from July to August, and the minimum in October. From May to August, soil respiration rate was obviously higher in secondary forest than in L. gmelinii plantation. The respiration rate of litter layer during the study period varied from -0. 65 to 1.26μmol CO2·m^-2·s^-1 in secondary forest, and from -0. 43 to 0. 47μmol CO2·m^-2·s^-1 in L. gmelinii plantation. Soil respiration had a strong exponential correlation with soil temperature, especially the temperature at 5 cm depth. The Q10 value at 5 cm depth was 3.61 and 3.07, respectively in secondary forest and L. gmelinii plantation. There was a significant correlation between soil respiration and the soil water content at 10-20 cm depth in secondary forest, but less correlation was observed between them in L. gmelinii plantation.