摘要
在100%、70%、40%和10%4种光照条件下,对东北红豆杉苗期生长及光合特性进行了研究。结果表明:在100%、70%光照下,净光合速率(Pn)日变化呈现"双峰型"曲线,有明显的"光午休"现象,后者较前者的"光午休"作用减弱了17.7个百分点;强光、高温、低湿是引起"光午休"的主要环境因子。在70%光照下,苗高、地径的生长量最大,净光合速率和水分利用率最高。70%光照是东北红豆杉苗期生长的适宜光环境。
Under four kinds of light conditions（100%, 70%, 40% and 10% ）, the seedling growth and photosynthetic characteristics of Taxus cuspidata was studied, the results show that： under 100%, 70% light, the net photosynthetic rate （Pn） showed the day changes in ＂bimodal＂ curve, with a clear ＂light lunch break＂ phenomenon, ＂light lunch break＂ role of the latter than the former weakened 17.7 percentage points; The main environmental factors which caused the phenomenon were strong light, high temperature and low humidity. Under 70% full sun, the biomass of basal diameter and seedling height was the biggest among four shading levels, respectively. The Pn and WUE was the biggest at 70% full sun respectively . Therefore, Taxus cuspidate grows better in 70.% light intensity than the others.
出处
《吉林林业科技》
2008年第1期1-4,共4页
Journal of Jilin Forestry Science and Technology
关键词
东北红豆杉
苗期
遮荫
生长
光合特性
Taxus cuspidate
seedling stage
shading
growth
photosynthetic characteristic
