天然赤枝栲林下几种植物的生理生态特性研究

Study on Some Physiological and Ecological Characters of Some Plants in the Forest Community of Castanopsis kawakamii, Sanmin, Fujian

本文通过对天然赤枝栲林林下的几种植物生理生态学特性进行了研究,结果表明:(1)大多数植物之间蒸腾强度的日变化有显著的差异,日进程分别为单峰、双峰形曲线。但在林下阴湿环境中,植物的蒸腾速率较小;叶片含水量低而日变化不大;调节水分平衡能力的大小为:光叶菝葜>芒萁>狗脊蕨>狗骨柴>木荷,且都较强,水分保持力高。(2)几种植物的叶绿素含量变化范围为3.573—4.225mg/dm^2,a/b的变化值为1.62—2.62。可以认为,该几种植物蒸腾速率低,失水缓慢,保水力强,叶绿素含量较高,而a/b值低,在赤枝栲的长期遮荫下,适于阴湿的生境,为较耐荫植物。

Some physiological and ecological characters of some plants in forest community of Castanopsis kawakamii were studied. The results showed that: (l)under crown cover, there is a weak light intensity, raising the average humidity and decreasing the range of temperature and forming a more hydrop-hytic environment, in such condition, the transpiration rates of the plants were lower. The varity of the relative content of moisture in leaves was little. The water-holding capacity in the leaf tissues of these plants was stronger.(2)from all 5 species of these plants, the specific leaf weight obtained was about 0.56-1.32 g/dm2,leaf area ratio was about75.76-178. 57cm2/g. Their leave cuticles thick and leathery.The level of chlorophyll of leaves is high,about 3.573-4.225 mg/dm2, the chlorophyll a/b ratio is low, about 1.62-2.67. It can be concluded that these plants studied are shady ones.