摘要
比较研究了3年生红皮云杉和嫩江云杉苗木在不同水分条件下的光合特征,并探讨其对水分胁迫的适应机制。研究结果表明,不同光强下两种云杉的最大光合速率(Pmax)随土壤含水量的降低而逐渐下降,且嫩江云杉的降幅较小;表观量子效率(AQY)、蒸腾速率(Tr)、气孔导度(Gs)也都呈下降的趋势。暗呼吸速率(Rd)和水分利用率(WUE)在逐渐干旱的过程中先上升后下降,而胞间CO2浓度先下降,后随上升。这表明在水分胁迫较为严重时,光合速率的降低主要是非气孔限制造成的。比较上述指标的变化情况可以看出,嫩江云杉对干旱的适应性要强于红皮云杉。
Photosynthetic characteristics of 3-years-old Korean spruce and Nenjiang spruce seedlings were studied under different water conditions in order to explore their adaptation mechanism to water stress. The results showed that maximum photosynthetic rate （Pmax）under different light reduced with the reducing of soil moisture content, and the reduction of Nenjiang spruce is smaller; apparent quantum yield （AQY）, transpiration rate （Tr）, stomatal conductance （Gs） also decreased. Dark respiration rate （Rd） and water use efficiency （WUE） rised firstly and then descended as drought become intensified, however, intercellular （Ci） descended firstly then rised. These results showed that photosynthesis was limited by non-stomatal factor under serious drought. It is indicated that the ability to water stress of Nenjiang spruce is stronger than that of Korean spruce by comparing above indexes.
出处
《植物研究》
CAS
CSCD
北大核心
2007年第4期445-448,共4页
Bulletin of Botanical Research
基金
黑龙江省科技公关项目(GB02103)
关键词
红皮云杉
嫩江云杉
水分胁迫
光合特征
Picea koraiensis Nakai
Picea koraiensis Nakai var. nenjiangensis S. Q. Nie et X. Y. Yuan
water stress
photosynthetic characteristics
