中文摘要：

利用Licor-6400-09土壤呼吸测定系统对南京林业大学树木园内3种人工林（马褂木林、栓皮栎＋雪松＋刺槐混交林、柳杉林）土壤呼吸速率的季节变化及其影响因子进行分析。结果表明：（1）3种人工林的土壤呼吸速率具有明显的季节变化,夏季（7月）较高,马褂木林、栓皮栎＋雪松＋刺槐混交林和柳杉林的土壤呼吸速率最高值分别为4.74、4.09和4.14μmol/（m2.s）;冬季（12月）最低,分别为1.48、1.21和0.85μmol/（m2.s）;（2）3种人工林的年均土壤呼吸速率有显著差异（p〈0.05）,年均土壤呼吸速率大小排序为马褂木林、栓皮栎＋雪松＋刺槐混交林、柳杉林;（3）3种人工林的土壤呼吸速率与土壤温度呈显著性指数相关,与土壤含水率呈显著线性相关;（4）3种人工林的Q10值存在一定程度的差异,柳杉林的Q10值大于栓皮栎＋雪松＋刺槐混交林和马褂木林的Q10值。

英文摘要：

Soil respiration was measured using Licor-6400-09 system in the three different urban plantations in Nanjing Forestry University,and its main regulating factors were also measured at the same time during October,2007 to September,2008.The three plantation types were Chinese tulip-tree,Chinese cedar and mixed plantation of cork oak,deodar cedar and black locust.The results showed that（1） The seasonal fluctuations of soil respiration rates were significant in Chinese tulip-tree,Chinese cedar and mixed plantation,and with maximum of 4.74,4.09 and 4.14 μmol/（m2· s） in summer,respectively,and minimum of 1.48,1.21 and 0.85 μmol/（m2· s） in winter,respectively.（2） The annual mean of soil respiration rate was significantly different among three different plantations（p0.05）.The order of the annual mean of soil respiration rate was： Chinese tulip-tree,mixed plantation,and Chinese cedar.（3） Soil respiration was significantly correlated to soil temperature and soil moisture.（4） The Q10 value was different between three plantations,and the Chinese cedar plantation had the largest Q10 value.The results provide theoretical basis for understanding of carbon cycle in urban plantation of this region.