应用生态学报2017，Vol.28Issue(7)：2143-2148,6.DOI:10.13287/j.1001-9332.201707.015
北京西山侧柏林冠层不同高度处叶片水分利用效率
Foliar water use efficiency of Platycladus orientalis of different canopy heights in Beijing western mountains area, China
摘要
Abstract
In this study,we focused on Platycladus orientalis,a widely distributed tree species in Beijing western mountains area,and precisely determined its foliar water use efficiency (including instantaneous water use efficiency derived from gas exchange and short-term water use efficiency obtained on carbon isotope model) by carefully considering the discrepancies of meteorological factors and atmosphere CO2 concentration and δ13C among different canopy heights,hoping to provide theoretical basis for carbon sequestration and water loss in regional forest ecosystem,and offer technical support for regional forest management and maintenance.The results showed that the foliar instantaneous water use efficiency tended to increase with the increasing canopy height,following the order of the upper canopy ＞ the middle canopy ＞ the lower canopy.A variety of meteorological factors synergistically influenced stomatal movement,and stomatal conductance would in turn have an effect on foliar instantaneous water use efficiency.Foliar short-term water use efficiency also increased with increasing canopy height,following the order of the upper canopy ＞ the middle canopy ＞ the lower canopy.The differences of foliar short-term water use efficiency among different heights could be explained by discrepancies of environmental drivers and atmosphere CO2 concentration and δ13C.Platycladus orientalis leaves in upper canopy adapted to ambient condition by improving water use efficiency.关键词
侧柏林/冠层高度/瞬时水分利用效率/短期水分利用效率Key words
Platycladus orientalis forest/canopy height/instantaneous water use efficiency/short-term water use efficiency引用本文复制引用
张永娥,余新晓,陈丽华,贾国栋,张祯尧,孙立博,张杰铭,侯贵荣..北京西山侧柏林冠层不同高度处叶片水分利用效率[J].应用生态学报,2017,28(7):2143-2148,6.基金项目
本文由国家自然科学基金项目(41401013,41430747)资助 This work was supported by the National Natural Science Foundation of China (41401013,41430747). （41401013,41430747）
