生态学报2025，Vol.45Issue(6)：2605-2620,16.DOI:10.20103/j.stxb.202407241744
柴达木盆地荒漠灌木水分利用效率及其影响因素
Water use efficiency of desert shrub in Qaidam basin and its influencing factors
摘要
Abstract
Plants in arid regions possess unique physiological mechanisms to conserve water and resist drought,which are crucial for their survival and growth.However,the trend of WUE along the drought gradient and its relationships with plant physiological and ecological factors and environmental factors in high-altitude desert areas remain unclear.In this study,we selected nine typical shrubs from Golmud,Nomuhong,Da Qaidam,Delhi,and Dulan as research subjects,measured the instantaneous and intrinsic water use efficiency of different plants using the gas exchange method,and used the δ13 C value to represent the long-term water use efficiency of plants.We analyzed the response characteristics of water use efficiency to plant physiological and ecological factors and environmental factors using Pearson correlation analysis and redundancy analysis.The results showed that both instantaneous and intrinsic water use efficiency were significantly positively correlated with δ13 C at both community and species scales(P＜0.05).Water use efficiency showed an overall increasing trend with the increase of drought degree.There are significant differences in water use efficiency between different species,and Calligonum korlaense,as a C4 species,its long-term,instantaneous and intrinsic water use efficiency were higher than other C3 species.The influence of plant physiological and ecological factors on water use efficiency is stronger than that of soil physical and chemical properties and climate factors,which explained 91.14%,35.64%,and 39.68%of the overall variation in water use efficiency,respectively.Among them,the intercellular CO2 concentration(Ci),leaf net photosynthetic rate(A)and soil total phosphorus(STP)have the greatest influence on water use efficiency,with explanatory power of 15%,10.8%,and 8.3%,respectively.The results are of great significance for understanding the characteristics and physiological and ecological mechanisms of water use efficiency of typical desert plants in high altitude desert areas.关键词
柴达木盆地/荒漠灌木/水分利用效率/影响机制Key words
Qaidam basin/desert shrub/water use efficiency/influence mechanism引用本文复制引用
赵昀浩,孙红艳,陈辉,杨帆..柴达木盆地荒漠灌木水分利用效率及其影响因素[J].生态学报,2025,45(6):2605-2620,16.基金项目
河北省自然科学基金面上项目(D2023205005) （D2023205005）
国家自然科学基金面上项目(40971118) （40971118）
