北亚热带次生栎林生态系统呼吸作用对温度的响应

摘要

为了弄清森林生态系统碳源、碳汇的时空格局,为预测全球气候变化提供相应的数据积累,运用涡度相关技术对北亚热带次生栎林生态系统进行CO2通量观测,得到2007年12月至2008年11月的碳通量数据.对非生长季(12月至翌年2月)全天与生长季(3-11月)夜间的通量值(即呼吸值)与气温和土温的响应关系分析表明:呼吸作用大小与气温和土温呈现出显著的Van't Hoff指数相关关系.其中,非生长季的呼吸值与气温拟合效果最佳,生长季夜间的呼吸值与土温拟合效果最佳.%In order to clarify the temporal and spatial patterns of carbon source and carbon sequestration of forest ecosystem, and to collect the relevant data for forecasting of global climate change, the CO2 flux of northern subtropical secondary oak forest ecosystem was observed by eddy covariance technique, the carbon flux data of the forest ecosystem from December 2007 to November 2008 were obtained by long-term observations. The analyses of response relationship of the carbon flux value (respiration) observed during the whole day in non-growing season ( December - February) and at night of growing season (March - November) to the air and soil temperature showed that there was a significant Van' t Hoff index relationship between the respiration intensity and the air and soil temperature. The respiration observed in non-growing season fitted the best with air temperature, whereas the respiration observed at night of growing season fitted the best with soil temperature.