生态学杂志2024，Vol.43Issue(6)：1558-1565,8.DOI:10.13292/j.1000-4890.202406.027
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
摘要
Abstract
To explore the effects of altitude on stable carbon isotope composition(δ13Cp)and intrinsic water use ef-ficiency(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 in δ13Cp and iWUE of plants with different photosynthetic pathways(C3 and Crassulacean acid metabolism,CAM)and dif-ferent life forms in C3 plants(shrubs,broad-leaved trees,and coniferous trees)along the altitude gradient.Results showed that:(1)The δ13Cp values of C3 plants ranged from-26.72‰ to-31.67‰,with an average value of-29.12‰.δ13Cp values of CAM plants ranged from-13.24‰ to-14.59‰,with an average value of-13.77‰.(2)The δ13Cp and iWUE values of CAM plants were significantly higher than those of C3 plants,and the δ13Cp 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,the δ13Cp and iWUE values of trees and shrubs decreased with increasing altitude,which was influenced by soil moisture.Above 3200 m,however,the δ13Cp and iWUE values of shrubs increased with increa-sing 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 adapta-bility 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Key words
C3 plant/CAM plant/soil moisture/temperature/plant functional type引用本文复制引用
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..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[J].生态学杂志,2024,43(6):1558-1565,8.基金项目
国家自然科学基金项目(42067049,42101044,42077188)资助. （42067049,42101044,42077188）
