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作 者 ：王玉涛,李吉跃*,程炜,陈崇,耿欣

期 刊 ：生态学报 2008年 28卷 7期 页码：3143~3451

关键词：绿化树种；叶片δ13C；土壤温湿度；气象因子；比叶面积；水分利用效率；

Keywords:greening tree species, foliar carbon isotope composition (δ13C), soil temperature and humidity, weather factors, specific leaf area, water use efficiency,

摘 要 ：城市绿化树种是城市生态系统的重要组成部分，为了探讨城市绿化树种水分利用效率的季节变化及其影响因素，本文对北京24个城市绿化树种(包括6个常绿针叶和18个落叶阔叶树种)叶片碳同位素组成（δ13C）的季节变化以及与土壤温湿度和气象因子的相关性进行了研究。结果表明：常绿树种叶片δ13C季节间差异不显著，春、夏和秋季的平均值都接近-25.9‰，在-27.0‰~-24.5‰间变化；落叶树种叶片δ13C季节间差异极显著（p=1.97×10-7秋季>夏季，表明绿化树种水分利用效率（WUE）也为春季>秋季>夏季。研究发现：叶片δ13C与比叶面积（SLA）呈显著的负相关（落叶p=6.195×10-8

Abstract:Greening tree species in urban is vital part of urban ecosystem. To study effects of seasonal variation and other variables on water use efficiency the tree species, 24 trees species (6 evergreen conifer and 18 deciduous broadleaf trees) were used to examined seasonal change in the foliar δ13C and relationships of the δ13C with soil temperature, humidity and the other weather variables in Beijing Botanical Garden in 2006， The results showed that the foliar δ13C of evergreen species had insignificant difference,and the seasonal change wad from -27.0‰ to -24.5‰, however, the foliar δ13C these deciduous species and the seasonal change were insignificantly different（p=5.05×10-6

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