泉州湾河口湿地几种植物的光合特性

The photosynthetic characteristics of several plant species in Quanzhou Bay Estuarine Wetland

2008年8月3日,对泉州湾河口湿地下游的优势植物桐花树、秋茄和白骨壤的光合作用进行了测定,并分析了这些植物的光合作用特点及其与气候因子的相关关系。研究表明,由于潮水的影响,3种植物的净光合速率日变化曲线均为3峰曲线,日平均净光合速率的排序为白骨壤>桐花树>秋茄。3种植物的净光合速率与其自身的生理因子有显著相关,尤其是与胞间CO2浓度有极显著的负相关。不同植物的光合作用受气孔导度的影响不同,桐花树和白骨壤受气孔导度影响显著,而秋茄则不受气孔导度的影响。通过分析发现,白骨壤适应生长在高盐环境下,但易受水分胁迫;秋茄适应生长在潮水变化的环境下,易受盐分胁迫;桐花树则介于两者之间。

The photosynthetic charcteristics of the dominant plants Aegiceras corniculatum, Kandelia candel and Avicennia marina at downstream in Quanzhou Bay Estuarine Wetland on August 3, 2008 were measured, and the relationship between the photosynthetics of these plants and the climatic factors were analyzed. The results showed that the diurnal variation of net photosynthetic rates of three species of plants was three-peak curve due to tidal action. The order of the average daily net photosynthetic rate was as following： Avicennia marinaAegiceras corniculatumKandelia candel. The net photosynthetic rate of the plants was significantly correlated with their own physiological factors. There was a significant negative correlation between the net photosynthetic rate of the plants and the intercellular CO2 concentration, especially. The impact of stomatal conductance on the photosynthesis varied with plants. The net photosynthetic rates of Aegiceras corniculatum and Avicennia marina were significantly affected by stomatal conductance, and that of Kandelia candel was not affected. It was found that Avicennia marina had the adaptation to high salt environment, and sensitivity to flooding. But, Kandelia candel had the adaptation to tide changes, and sensitivity to high salt environment. The adaptation to high salt environment and flooding of Aegiceras corniculatum was intermediate between Avicennia marina and Kandelia candel.