梅里雪山植物稳定碳同位素组成及其内在水分利用效率随海拔梯度的变化  

Changes in stable carbon isotope composition and intrinsic water use efficiency of plants along an altitude gradient in the Meili Snow Mountain

作　　者：蔡锦枫 薛子静 黄康祥 张远 袁博森 任久生 史晓宜 蒲焘 石福习 CAI Jinfeng;XUE Zijing;HUANG Kangxiang;ZHANG Yuan;YUAN Bosen;REN Jiusheng;SHI Xiaoyi;PU Tao;SHI Fuxi(Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China;School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;College of Geography and Environment Sciences,Zhejiang Normal University,Jinhua 321000,Zhejiang,China;Yulong Snow Mountain Glacier and Environment Observation and Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]江西农业大学林学院,鄱阳湖流域森林生态系统保护与修复国家林业与草原局重点实验室,南昌330045 [2]东华理工大学水资源与环境工程学院,南昌330013 [3]浙江师范大学地理与环境科学学院,金华321000 [4]中国科学院西北生态环境资源研究院,丽江玉龙雪山冰冻圈与可持续发展国家野外科学观测站,兰州730000

出　　处：《生态学杂志》2024年第6期1558-1565,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(42067049,42101044,42077188)资助。

摘　　要：为了探究海拔对我国西南高寒地区植物稳定碳同位素组成特征及水分利用效率的影响,本研究以梅里雪山东坡不同海拔(2200、2500、2700、3000、3200和4200 m)上不同功能型植物为对象,分析了不同光合途径(C3和Crassulacean acid metabolism,CAM)植物和C3植物中不同生活型(灌木、阔叶乔木和针叶乔木)植物叶片稳定碳同位素组成特征(δ^(13)C_(p))及内在水分利用效率(intrinsic water use efficiency,iWUE)随海拔梯度的变化。结果表明:(1)梅里雪山东坡C3植物叶片的δ^(13)C_(p)值分布范围在-26.72‰~-31.67‰,均值为-29.12‰,而CAM植物的δ^(13)C_(p)值分布范围在-13.24‰~-14.59‰,均值为-13.77‰;(2)CAM植物δ^(13)C_(p)值和iWUE显著高于C3植物,其中,C3植物中不同生活型植物δ^(13)C_(p)和iWUE值呈现灌木>阔叶乔木>针叶乔木的变化规律;(3)海拔3200 m以下乔木和灌木植物δ^(13)C_(p)和iWUE值随海拔升高而降低,主要受土壤水分的影响,3200 m以上灌木植物δ^(13)C_(p)和iWUE值随海拔升高有增大的趋势,可能受温度的调控。梅里雪山东坡不同功能型植物水分利用效率对海拔梯度的响应反映了不同植物对高寒山地气候不同的适应性。To explore the effects of altitude on stable carbon isotope composition(δ^(13)C_(p))and intrinsic water use efficiency(iWUE)of different functional plants at different altitudes(i.e.,2200,2500,2700,3000,3200 and 4200 m)on the eastern slope of the Meili Snow Mountain,Southwest China,we examined the variations inδ^(13)C_(p)and iWUE of plants with different photosynthetic pathways(C3 and Crassulacean acid metabolism,CAM)and different life forms in C3 plants(shrubs,broad-leaved trees,and coniferous trees)along the altitude gradient.Results showed that:(1)Theδ^(13)C_(p)values of C3 plants ranged from-26.72‰to-31.67‰,with an average value of-29.12‰.δ^(13)C_(p)values of CAM plants ranged from-13.24‰to-14.59‰,with an average value of-13.77‰.(2)Theδ^(13)C_(p)and iWUE values of CAM plants were significantly higher than those of C3 plants,and theδ^(13)C_(p)and iWUE values for different life forms in C3 plants varied in the order of shrubs>broad-leaved trees>coniferous trees;(3)Below 3200 m,theδ^(13)C_(p)and iWUE values of trees and shrubs decreased with increasing altitude,which was influenced by soil moisture.Above 3200 m,however,theδ^(13)C_(p)and iWUE values of shrubs increased with increasing altitude,which was influenced by temperature.Overall,the response of water use efficiency of species from different functional groups in the Meili Snow Mountains to the variations of altitude may reflect the different adaptability of different plant species to alpine climate.

关 键 词：C3植物 CAM植物 土壤水分 温度 植物功能型 

分 类 号：S718.5[农业科学—林学]