【摘要】 以关帝山庞泉沟自然保护区来自3个海拔梯度(1650 m、1980 m和2268 m)的麦氏云杉2年生天然幼苗为试验材料,进行不同海拔麦氏云杉相互移栽,测定移植1个生长季后幼苗的光合生理和叶绿素荧光特性,以期了解来自不同种源麦氏云杉幼苗对海拔的适应性及其对未来气候变化的响应和适应能力。结果表明:1)低海拔种源麦氏云杉幼苗移栽至高海拔之后,气孔导度(gs)减小,蒸腾速率(E)降低,光合速率(An)降低,可溶性糖含量降低,高海拔种源幼苗移栽至低海拔则有相反的趋势。2)最大量子效率(Fv/Fm)、电子传递效率(ETR)、1,5-二磷酸核酮糖最大再生效率(Jmax)和磷酸丙糖利用效率(TPU)指标在样地和种源间差异不显著。综上所述,麦氏云杉幼苗生理特性主要受环境因素的影响,海拔来源的影响较小。更多还原

【Abstract】 The natural seedlings of 2-year-old meyer spruce from 3 altitudinal gradients( 1650 m and 1980 m and 2268 m) in Pangquan ditch nature reserve in Guandi mountain,were selected to detect the photosynthetic physiological and chlorophyll fluorescence characteristics of meyer spruce seedlings after transplantation within one growing season,in order to investigate the response and adaptation of seedlings from different sources to altitude and future climate. The results showed that: 1) When meyer spruce seedlings from low altitude were transplanted to high altitude,stomatal conductance( gs),transpiration rate( E),photosynthetic rate( An) and soluble sugar content were decreased,while seedlings from high altitude presented the opposite trend. 2) the maximum quantum efficiency( Fv / Fm),electron transport efficiency( ETR),Rubp regeneration efficiency( Jmax) and largest triose phosphate utilization efficiency( TPU) index were significantly different between the control and provenance. In conclusion,physiological characteristics of Meyer spruce seedling were mainly impacted by environmental factors,while altitude showed a smaller influence.更多还原