湘西北腊梅群落优势树种的生理生态学特性研究

对湘西北腊梅群落中 4个优势树种的光合、呼吸、蒸腾以及矿质营养等基本生理生态学指标进行了测试分析。结果表明 ,腊梅和香叶树的光—光合特性较为优良 ,它们对光合有效辐射的适应幅度更宽 ,净光合速率较高。香叶树的暗呼吸强度最低而水分利用效率最高 ,腊梅则对土壤矿质营养的选择性主动吸收能力最强。利川润楠和八角枫的生理生态学特性较之于腊梅和香叶树 ,显示出一定的劣势。

Study on Physiological Characteristics of Dominant Species of Chimonanthus praecox Community in Northwest Huana

Physiological index of photosynthesis, respiration, transpiration and mineral nutrients of dominant species of Chimonanthus praecox community in Northwest Hunan were carried out. It was found that the net photosynthetic rates were high, and they can accommodate a wider range of PAR in certain environmental conditions for Chimonanthus praecox and Lindera communis. Among these four species, the dark respiration rate was lowest and the water use efficiency was highest for L. communis, and the selected absorptance of mineral nutrients was strong in C. praecox. The physiological indexes for Machilus lichuanensis and Alangium chinensis were relatively weak among these four species.