天目山常绿、落叶阔叶混交林生长季能量通量及平衡分析

Energy flux and balance analysis of evergreen and deciduous broad-leaved mixed forest in Tianmu Mountain during growing season

为探讨森林生态系统的能量平衡关系,利用开路涡度相关系统和常规气象仪器的观测结果,分析了2014年天目山常绿、落叶阔叶混交林生长季的能量通量变化特征,并计算了波文比及其能量闭合度.结果表明:生长季净辐射总量为1 810.2MJ·m^(-2),潜热通量、显热通量和土壤热通量分别为1 033.0、727.7和53.8 MJ·m^(-2),潜热通量占净辐射的57%,显热通量占净辐射的40%,土壤热通量占净辐射的3%;生长季能量闭合度为1.002,月平均能量闭合度为0.99.

To understand the energy balance closure of forest system, open-path eddy covariance system and meteorological instru-ments were used to depict the features of energy flux in an evergreen and deciduous mixed hardwood forest in Tianmu Mountain dur-ing growing season in 2014. Bowen ratio and energy balance closure were also evaluated. Results showed that total net radiation of Timu Mountain in growing season was 1 810.2 MJ·m^-2. Latent heat, sensible heat and soil heat fluxes were 1 033.0, 727.7 and 53.8 MJ·m^-2, respectively, accounting for 57%, 40% and 3% of the net radiation. The energy balance closure was 1.002 in the growing season in 2014, with monthly average being 0.99.