中文摘要：

湿地的研究已成为生态学的重点，而湿地CO2通量研究则是该领域研究热点问题之一．采用L1—8100土壤碳通量测量系统，测定了锡林河流域不同利用方式（围封保育与自由放牧）下的湿地土壤呼吸速率并分析了土壤温度、土壤湿地和地下根生物量等对其影响．结果表明，（1）湿地植物群落土壤呼吸日变化均呈现不对称单峰型曲线，其主要受土壤温度的影响．围封保育湿地植物群落土壤呼吸速率和日变化幅度均低于自由放牧样地，但其Q10值高于自由放牧样地，均值分别为2．848和2．250．（2）在0—50cm各层土壤温度中，围封样地湿地植物群落土壤呼吸速率与地下10cm的土壤温度拟合最好，而自由放牧样地则与地下15cm的温度拟合最好．在围封湿地植物群落中土壤温度可以解释呼吸变化速率的57．2％-86．3％，而在自由放牧湿地植物群落中土壤温度则可以解释呼吸变化速率的57．7％-88．9％．（3）在湿地植物群落中，土壤温度是水分含量最高的湿地植物群落土壤呼吸的敏感因子，最高温时其呼吸速率达到峰值；而土壤水分是水分含量最低的湿地植物群落土壤呼吸的敏感因子，其土壤呼吸速率峰值出现在生长季水分含量最高月份．

英文摘要：

Research on w;tlands has become the focus of ecology,and the research on CO2 flux has been one hot topic. With the L1-8100 soil carbon flux measurement system, the different soil respiration were determined ,and the corresponding effect of relevant soil moisture,ground and underground biomass and soil temperature on it was analyzed, a）The results shown that the daily variation of soil respiration presents an asymmetric and single peak curve,and this variation was mainly determined by soil temperature. In the whole growing season, the amplitude in enclosed wetlands was lower than that in degraded wetlands,the Q10 of enclosed wetlands, however,was high than that of degraded wetlands,and the means were 2. 848 and 2. 250 respectively, b）The soil respiration fitted best with temperature of underground lOcm in enclosed wetlands,but fitted best with temperature of underground 15cm in degraded wetlands. Soil temperature could explain the variation of soil respiration in enclosed and degraded wetlands by 57.2%-86.3% and 57.7%-88.9% respectively. c）Soil temperature was the main sensitive factor of soil respiration in wetland plant communities with the highest moisture,when the temperature went to the highest,the respiration got to a peak; soil moisture is a sensitive factor in wetland communities with the lowest moisture,and the soil respiration rate got to a peak in the growing season when the soil moisture was highest.