摘要
香椿叶片光合速率季节性变化为双峰曲线 ,最高峰出现在 6月 ,次高峰出现在 8月。日变化也呈双峰曲线 ,最高峰出现在 9:30 ,次高峰出现在 16 :30 ,午间有明显的“午休”现象 ,叶片光合能力等非气孔因素是导致午休的主要原因。香椿光合作用的光饱和点为 110 0 μmol·m- 2 ·s- 1,补偿点为 5 3.9μmol·m- 2 ·s- 1。光合作用最适温度为 35 .8℃。
The photosynthesis of Toona sinensis and the effect of environmental factors were studied. The results show that the curve of seasonal variation of T. sinensis shows two peaks, which appear in June and August. The diurnal net photosynthesis rate varies with double peak curve. The first occurs at 9:30 and the second at 16:30 respectively. There is a significant midday depression. Non stomatal factors like the ability of leaf are the main causes of the pause. The light compensation point and light saturation point of T. sinensis leaves are 53.9 μmol.m -2 .s -1 and 1 100 μmol.m -2 .s -1 respectively. The optimal temperature for photosynthesis of T. sinensis leaves is 35.8 ℃.
出处
《林业科学研究》
CSCD
北大核心
2002年第4期432-436,共5页
Forest Research
基金
河南农业大学与美国路易斯安娜州州立大学农业中心合作研究项目 (970 0 0 1)
关键词
幼树
光合作用
影响因子
香椿
椿芽菜
木材
Toona sinensis
photosynthetic characteristic
environmental factor
