南岭典型森林树种蒸腾作用特征初步研究

Primary study of transpiration characteristics of typical tree species in forest plantation of Nanling mountains,Northern Guangdong

应用便携式光合作用系统 Licor-6400对南岭森林生态系统中几种典型树种的蒸腾作用日进程进行了观测.观测表明:(1)处于林冠层不同高度的树种(藜蒴 Castanopsis fissa 和羊角杜鹃 Strophanthus divaricatus)其蒸腾作用日进程变化特征不同;(2)针叶树(杉木 Cunninghamia lanceolata)与阔叶树(藜蒴和羊角杜鹃)二者具有不同的蒸腾作用日变化进程.

Evapotranspiration of forest plantation plays a significant role in evaluation of ecological benefit from forest ecosystem. In this paper, measurements conducted with a Lieor 6400 photosynthesis system on typical tree species in forest plantation of Nanling mountains, northern Guangdong was made to determine their characteristics in diurnal patterns of transpiration at the canopy level. And the following can be concluded： （1） diurnal pat- terns of transpiration varied with tree species with different height （i.g., Castanopsis fissa versus Strophanthus divaricatus） in the canopy, Castanopsis fissa in the upper canopy whereas Strophanth~ divaricatus in the lower canopy; （2） daily change in transpiration was also different with tree species of conifers and broadleaves （i.g., Cunninghamia lanceolata versu Castanopsis fissa and Strophanthus divaricatus ）.