巴郎山大叶醉鱼草叶片非结构性碳水化合物和氮分配的海拔响应  

Response of leaf non-structural carbohydrate and nitrogen allocations to an elevation gradient in Buddleja davidii along Balang Mountain,Sichuan Province

作　　者：乌佳美 冯秋红[3] 史作民[1,2,4] 刘顺 曹向文 许格希 WU Jiamei;FENG Qiuhong;SHI Zuomin;LIU Shun;CAO Xiangwen;XU Gexi(Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,China;Miyaluo Research Station of Alpine Forest Ecosystem,Lixian 623100,China;Sichuan Academy of Forestry,Chengdu 610081,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091 [2]四川米亚罗森林生态系统定位观测研究站,理县623100 [3]四川省林业科学研究院,成都610081 [4]南京林业大学南方现代林业协同创新中心,南京210037

出　　处：《生态学报》2022年第17期7278-7287,共10页Acta Ecologica Sinica

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

摘　　要：为深入认识和探讨植物对环境变化的生理生态响应和适应,以分布在川西巴郎山的大叶醉鱼草(Buddleja davidii)为研究对象,沿海拔梯度对植物叶片中非结构性碳水化合物(NSC)、可溶性糖和淀粉含量,氮含量和氮分配比例(光合系统氮分配比例P_(P)、细胞壁氮分配比例P_(CW)和其他组分氮分配比例P_(other))等参数进行对比分析,探讨其沿海拔的变化趋势,以及叶片NSC、可溶性糖和淀粉含量与氮分配间的相关关系。结果显示:大叶醉鱼草叶片NSC、可溶性糖、淀粉和单糖含量随海拔的升高而增加,而可溶性糖/淀粉比值未发生显著变化,表明高海拔较高的NSC含量的累积是由可溶性糖和淀粉含量共同决定的,而可溶性糖含量的增加主要由单糖含量的变化引起。叶片氮含量和P_(P)在海拔间差异不显著,但P_(CW)和P_(other)分别随海拔升高而降低和升高。此外,随海拔升高,叶片NSC/N比值随之增加,这主要归因于随海拔升高而增加的NSC含量而非海拔间差异不显著的氮含量。NSC含量和可溶性糖含量均与P_(other)显著正相关,说明叶片P_(other)和NSC含量的累积共同用于提高大叶醉鱼草在高海拔恶劣环境下的适应性。In order to better understand and explore the physiological and ecological response and adaptation of plants to environmental changes,Buddleja davidii distributed in the Balang Mountain in western Sichuan province was selected as the object.The contents of leaf non-structural carbohydrates(NSC),soluble sugar and starch,nitrogen concentration and nitrogen allocation fractions(fraction of leaf nitrogen allocated to photosynthetic apparatus P_(P),cell wall P_(CW) and other components P_(other))along an elevation gradient were compared to study their elevational patterns.Moreover,the correlations between the NSC,soluble sugar,starch and nitrogen allocations were analyzed.The results showed that the NSC,soluble sugar,starch and monosaccharides content of B.davidii leaves increased,while the soluble sugar/starch ratio did not change significantly along with elevation.These indicated that the accumulation of NSC at high elevation was determined by both soluble sugar content and starch content,while the increase in soluble sugar was mainly caused by monosaccharides content.Although leaf nitrogen concentration and P_(P) were not significantly different among elevations,P_(CW) and P_(other) decreased and increased along with elevation,respectively.Additionally,the NSC/N ratio of B.davidii leaves increased along with elevation,which was mainly caused by the increasing NSC content along the elevation rather than the insignificant nitrogen concentration among the different elevations.The contents of NSC and soluble sugar had significantly positive correlations with P_(other),indicating that the accumulation of P_(other) and NSC content functioned together to improve the adaptability of the plants in the harsh environment at high elevation.

关 键 词：非结构性碳水化合物(NSC) 可溶性糖 淀粉 氮分配比例 大叶醉鱼草 海拔 

分 类 号：Q945.79[生物学—植物学]