生态学报2023，Vol.43Issue(23)：9814-9826,13.DOI:10.20103/j.stxb.202210283066
岷江源区两种优势针叶树当年生小枝性状与生物量分配随海拔的分异规律
Differentiation patterns of current-year twig traits and biomass allocation of two dominant coniferous trees along an altitudinal gradient on the eastern edge of the Tibetan Plateau
摘要
Abstract
The current year twigs have less secondary tissue and are the most active part of the plant branching system.The variation along elevation gradients of current year twig traits and biomass allocation in woody plants are critical to understand the adaptation strategies of plant species to different habitats.This study was conducted in the headwater region of Minjiang River on the eastern edge of the Qinghai-Tibet Plateau,aimed to deal with the functional traits changes of twigs(stem length,stem diameter and specific stem length)and the biomass allocation in different organs(stem and leaf)of two dominant subalpine coniferous trees species(i.e.,Picea purpura and Abies faxoniana).Plant traits and biomass allocation were compared at different altitude(3500-3550 m,3650-3700 m,3800-3850 m),figuring out their biomass trade-off and growth strategies at different altitudes.The findings revealed that(1)the altitudinal interspecific difference of stem biomass was greater than their intraspecific difference,and the stem biomass at 3650-3700 m showed the greatest variation(128.4％).(2)Specific stem length of P.Purpurea existed a significantly positive correlation with altitude(P＜0.05).Furthermore,there was a significantly negative correlation between stem biomass,leaf biomass,and altitude(P＜0.05).A.faxoniana presented a significantly negative correlation between leaf biomass and altitude(P＜0.05).(3)With the increase of altitude,the biomass allocation ratio of P.Purpurea stem decreased from 33.0％to 27.0％.The stem biomass allocation ratio of A.faxoniana increased from 23.0％to 28.0％(4)At 3500-3550 m and 3650-3700 m,there were allometric relationships of P.purpura between stem biomass and leaf biomass,stem length and stem diameter;There were allometric relationships of A.faxoniana between stem biomass and leaf biomass,stem length and stem diameter at 3500-3550 m,3650-3700 m,and 3800-3850 m.The differences of two species in the biomass allocation ratio of their stem and related traits with altitude revealed that A.faxoniana was better adapted to high-altitude stress.关键词
岷江源区/海拔/当年生小枝/植物性状/异速生长/适应性策略Key words
Minjiang headwater region/altitude/current year twigs/plant traits/heterogeneous growth/adaptive strategies引用本文复制引用
张宁,王金牛,石凝,王丽华,朱牛,田炳辉,张林,盖艾鸿..岷江源区两种优势针叶树当年生小枝性状与生物量分配随海拔的分异规律[J].生态学报,2023,43(23):9814-9826,13.基金项目
中国国家自然科学基金项目(31971436) （31971436）
中国科学院西部之光西部青年学者项目(2021XBZG-XBQNXZ-A-007) （2021XBZG-XBQNXZ-A-007）
西北生态环境与资源研究院,冰冻圈科学国家重点实验室项目(SKLCS-OP-2021-06) （SKLCS-OP-2021-06）
