巴郎山糙皮桦叶片光合氮利用效率的海拔响应  

Response of photosynthetic nitrogen use efficiency in Betula utilis to altitudinal variation along Balang Mountain,Sichuan,China

作　　者：乌佳美 唐敬超[1] 史作民[1,2] 冯秋红[3] 赵广东[1] 刘顺[1] 曹向文 WU Jia-mei;TANG Jing-chao;SHI Zuo-min;FENG Qiu-hong;ZHAO Guang-dong;LIU Shun;CAO Xiang-wen(Key Laboratory on Forest Ecology and Environmental Sciences of State Forestry Administration,Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing 100091,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China;Sichuan Academy of Forestry,Chengdu 610081,China)

机构地区：[1]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室,北京100091 [2]南京林业大学南方现代林业协同创新中心,南京210037 [3]四川省林业科学研究院,成都610081

出　　处：《应用生态学报》2019年第3期751-758,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31570240);国家重点研发计划项目(2016YFC0502104-02);中央级公益性科研院所基本科研业务费专项基金项目(CAFYBB2018ZA003)资助~~

摘　　要：为深入认识植物对环境变化的响应和适应,以分布在川西巴郎山的糙皮桦为研究对象,选择海拔2200、2500、3100和3400 m 4个分布点,测定计算了各分布点叶片光合氮利用效率(PNUE)、CO_2扩散导度(叶肉细胞导度g_m与气孔导度g_s)和氮分配比例(Rubisco氮分配比例P_R、生物力能学组分氮分配比例P_B、捕光组分氮分配比例P_L与细胞壁氮分配比例P_(CW))等参数,分析了其沿海拔的变化趋势以及叶片PNUE与其他参数的相关关系.结果表明:糙皮桦叶片PNUE、P_R和P_B在海拔2500和3100 m相对较高;叶片g_s和g_m则随海拔升高而增加,P_L随海拔升高而降低.糙皮桦叶片P_R和P_B与PNUE呈显著正相关关系,说明P_R和P_B是PNUE随海拔变异的重要内部因素.糙皮桦叶片光合系统氮分配比例P_P在海拔2500和3100 m相对较高,叶片P_(CW)随海拔升高而降低,叶片其他组分氮分配比例P_(other)随海拔升高而增加,说明随海拔的升高,糙皮桦叶片趋向将更大比例的氮分配于除光合系统和细胞壁外的其他组分中.To better understand the response and adaptation of plants to altitudinal changes, four sites at the altitude of 2200 m, 2500 m, 3100 m and 3400 m on Balang Mountain were selected to test and calculate the eco-physiological parameters in leaves of Betula utilis, including photosynthetic nitrogen use efficiency (PNUE), CO2 diffusion conductance (stomatal conductance gs and mesophyll conductance gm) and nitrogen allocation in each component (fractions of leaf nitrogen allocated to Rubisco PR, to bioenergetics PB, to light-harvesting components PL, and to cell wall PCW). Their changes with altitudinal variations and the relationships between leaf PNUE and the other parameters were analyzed. The results showed that PNUE, PR, and PB of the leaves were relatively higher at 2500 m and 3100 m. With the increases of altitude, gs and gm increased and PL decreased. The correlations between PR, PB and PNUE were significant, indicating that PR and PB were the main factors driving the changes in leaf PNUE in response to altitudinal variations. Besides, the fraction of leaf nitrogen allocated to photosynthetic apparatus (PP) was relatively higher at 2500 m and 3100 m. With increasing altitude, PCW decreased and the fraction of leaf nitrogen allocated to the other components (Pother) increased, which suggested that B. utilis leaves tended to allocate more nitrogen to the other components instead of the photosynthetic apparatus and cell wall with the increasing altitude to well adapt environmental changes.

关 键 词：光合氮利用效率 CO2扩散导度 氮分配比例 糙皮桦 海拔 

分 类 号：S792.15[农业科学—林木遗传育种]