摘要
在夏季温室遮荫前后测定榕树和三雄蕊槟榔气体交换以及叶绿素荧光的变化。结果表明 :榕树耐强光和高温 ,而三雄蕊槟榔对强光和高温敏感。遮荫前的高温强光下 ,三雄蕊槟榔的光系统Ⅱ最大光化学效率明显下调 ,榕树光系统Ⅱ最大光化学效率只有轻微下调。遮荫后 ,这种下调都得以减缓 ;但伴随日均光合有效辐射的大幅降低 ,三雄蕊槟榔和榕树的日均净光合速率也降低 ,榕树的降低幅度略大于三雄蕊槟榔。以上结果说明 ,尽管夏季遮荫能够减轻光系统Ⅱ最大光化学效率的下调 ,但遮荫也使植物日均净光合速率下降 ,对喜光植物生长不利。
Gas exchange and chlorophyll fluorescence in Ficus microcarpa and Areca triandra in greenhouse before and after shading in summer were explored. Data revealed that A. triandra was sensitive to higher temperature and strong irradiance, however F. microcarpa was contrary. Maximal PSⅡ photochemical efficiency was down regulated distinctly in A. triandra at noon under higher irradiance and temperature before shading, whereas, only slight down regulation occurred in F. microcarpa. After shading, the down regulation was alleviated. Unfortunately, daily average photosynthetic rate in A.triandra and F. microcarpa decreased to some extent after shading; the former reduced smaller than the latter. Thus, it can be deduced that shading in summer could reduce the down regulation of the maximum PSⅡ photochemical efficiency, but shading also resulted in the decrease of daily average photosynthetic rate, especially to light preferring plants.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2004年第6期50-55,共6页
Scientia Silvae Sinicae
关键词
夏季
温室
榕树
三雄蕊槟榔
光合作用
日均净光合速率
Ficus microcarpa, Areca triandra, Greenhouse, Shading, High temperature, High irradiance, Photosynthesis
