长汀水土流失区5种主要植物的气体交换和荧光特征比较研究

利用便携式光合作用仪LI-6400和便携式叶绿素荧光仪PAM-2100对长汀严重水土流失区5种主要植物马尾松（Pinus massoniana）、黄瑞木（Adinandra millettii、油茶（Camellia oleifera Abel）、羊角藤（Morinda umbellata L）与芒萁（Dicranopteris dichotoma）的气体交换和荧光特征进行了实验研究.结果表明：马尾松与黄瑞木、油茶、羊角藤、芒萁之间Pn和Tr差异达显著水平;芒萁与黄瑞木、油茶、羊角藤之间Pn、Tr差异达显著水平;黄瑞木、油茶和羊角藤之间无显著性差异.马尾松、油茶和羊角藤净光合速率日变化曲线为双峰型,黄瑞木和芒萁为单峰型;马尾松、油茶和羊角藤存在“午休”现象且限制因素不同,马尾松光合午休由气孔限制因素引起,油茶和羊角藤由非气孔限制因素引起.随光照的增强,5个树种均发生光抑制,表现为最大荧光产量、有效量子产量均下降,非光化学猝灭上升,但物种间各参数变幅不同.

Gaseous Exchange and Fluorescence Characteristic of Five Plant Species in the Soil Erosion Area of Changting County

Gaseous exchange and fluorescence characteristic of five plant species in the soil erosion area of ehangting county were studied by utilizing the Li-6400 portable gas exchange fluorescence system and PAM-2100 photosynthesis yield analyzer under natural condition. The results show that there are an obvious significant differences between the net photosynthetic rate and transpiration rate of different species, Pinus massoniana had the highest P, and Tr. Diumal cours- es of net photosynthetic rate of Pinus massoniana, Camellia oleifera Abel and Morinda umbellata L display a two-peak pattern, whereas the two others show a single-peak pattern. Midday depression of photosynthesis of Pinus massoniana is caused by stomatal limitation, whereas Camellia oleifera Abel and Morinda umbellata L were caused by non-stomatal limitation ability. The maximal fluotescence in tensity at actinic light（Fm＇） and actual photochemical efficiency of PS II in the light （ФPSII） were reduced, while non-photochemical quenching of chlorophyll fluorescence （qN）and non-photo- chemical quenching （NPQ） were raised with the PAR enhancement which suggest that photoinhibition occurres in the five species. The parameter ranges are different between these species.