松栎混交林中马尾松与白栎光合作用的日变化  

Studies of the Diurnal Variations of Photosynthesis in the Mixed Forest of Pinus massonian and Quercus fabric

作　　者：李志辉[1] 卢兆银[1] 杨艳[1] 张斌[1] 杨模华[1] 

机构地区：[1]中南林业科技大学资源与环境学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2007年第1期76-80,共5页Journal of Central South University of Forestry & Technology

基　　金：湖南省教育厅科研项目(04C703);中南林业科技大学青年基金项目

摘　　要：自然条件下使用开放式气体交换LI-6400便携式光合测定系统对松栎混交林中的马尾松和白栎的光合速率、蒸腾速率、气孔导度等光合特性进行了测定.结果表明:马尾松与白栎之间的光合速率日变化有明显差异,马尾松呈双峰型,白栎呈单峰型;白栎光合特性对大气CO2浓度增加和温度升高等生态因子变化的响应比马尾松敏感,它的气孔导度与蒸腾速率的变化直接影响本身光合速率的变化.The diurnal variations of photosynthesis rate （Pn）, transpiration rate （Tr） and stomatal conductance （Cond） of the mixed forest of Pinus massonian and Quercus fabric were determined by using Li-6400 portable photosynthesis system under natural conditions. The results show that the diurnal variations of photosynthesis rate of the two plants were obviously different in that Pinus massonian took on a double peak curve while Quercus fabric took on a single peak one; that the response of photosynthesis for Quercus fabri to the rise of CO2 in the atmosphere and temperature was more sensitive than that for Pinus massoni; and that its diurnal changes of photosynthesis rate were immediately affected by its stomatal conductance and transpiration rate.

关 键 词：植物生理 混交林 马尾松 白栎 光合作用 日变化 

分 类 号：S791.248[农业科学—林木遗传育种] S722.33[农业科学—林学]