摘要
对柽柳的若干生理、生态学特性进行初步研究.用LI-6400便携式气体分析系统对内蒙古额济纳旗七道桥“天然胡杨林自然保护区”内自然状态下柽柳(Tamarix ramosissimaLedeb)的净光合速率、蒸腾作用、水分利用效率及相应环境因子进行测定.结果表明,柽柳净光合速率日变化曲线呈双峰型,蒸腾速率日变化曲线呈单峰型,水分利用效率最高值出现在上午时分.根据光合作用的气孔限制与非气孔限制两个标准,柽柳从11:00开始光合速率下降主要由气孔因素引起,14:00之后光合速率下降主要由非气孔因素引起,即主要由叶肉细胞的光合活性降低造成.
The net photosynthetic rate,transpiration rate, water use efficiency of Tamarix ramosissima Ledeh as well as the relevant environment factors in the ＂natural forest reserve of the inartificial Diversi form-leaved poplar＂ in Qidaoqiao area of Ejina,were measured with a portable LI-6400 gas analysis system under natural condition. The results show that the diurnal course of net photosynthetic rate of T. ramosissima displays a two-peak pattern, and that of their transpiration rate a signal-peak pattern, their water use efficiency culminates in the morning. On the basis of two criteria of stomata limitation and nonlimitation of photosynthesis,the predominant limiting factor of T. rarnosissima photosynthesis is stomata limitation beginning from 11：00. That is stomata nonlimitation after 14： 00, here, its photosynthetic rate is mostly determined by the photosynthesis active.
出处
《内蒙古师范大学学报（自然科学汉文版）》
CAS
2006年第2期229-233,共5页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(30160075)
关键词
柽柳
光合速率
气体交换
水分利用效率
Tamarix ramosissima Ledeb
photosynthetic rate
gas exchange
water use efficiency
