期刊论文

中文

林业科学

1001-7488

2004

40

5

88-92

10.3321/j.issn:1001-7488.2004.05.014

国家自然科学基金项目 （3 0 2 710 43 ）； 国家林业局重点科研项目 （2 0 0 1-0 7）； 湖南省自然科学基金项目 （0 0JJY2 0 2 4）。；

本校为第一机构

用Li-COR 6400便携式光合作用测定系统对亚热带常绿阔叶树种樟树幼树的光合特性及其对CO_2升高的响应进行了研究.结果表明:樟树叶片光合速率日变化呈双峰曲线 ,最高峰出现在10:00,次高峰出现在14:00,午间有明显的"午休"现象,气孔因素是导致午休的主要原因.中午光照强度大,叶片与空气之间的水汽压差达到最大值,相对湿度、气孔导度、胞间CO2浓度达到最小值,诱导叶片光合午休.正常大气条件下,樟树叶片光饱和点为1 250 μmol·m~(-2)s~(-1),光补偿点40.6 μmol·m~(-2)s~(-1) ,在1 000 μmol·m~(-2)s~(-1)光强下CO2饱和点为1 200 μmol·mol~(-1),CO_2补偿点为50 μmol·mol~(-1).水分利用效率、气...

The photosynthetic characteristics of Cinnamomum camphora and its response to CO 2 enrichment in subtropical evergreen broadleaf forest area were investigated using Li_COR 6400 portable photosynthesis system. The results showed that the diurnal net photosynthetic rate of C.camphora in sunny day varied with double peak curves. The peaks occurred at 10:00 and 14:00 respectively. There was a significant midday depression. Stomatal factors, such as the stomatal conductance, were the main causes of the depression. At midday, light intensity was the ...