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应用生态学报 ›› 2017, Vol. 28 ›› Issue (7): 2143-2148.doi: 10.13287/j.1001-9332.201707.015

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北京西山侧柏林冠层不同高度处叶片水分利用效率

张永娥, 余新晓*, 陈丽华, 贾国栋, 张祯尧, 孙立博, 张杰铭, 侯贵荣   

  1. 北京林业大学, 水土保持与荒漠化防治教育部重点实验室, 北京 100083
  • 收稿日期:2016-11-03 修回日期:2017-04-10 发布日期:2017-07-18
  • 通讯作者: *mail:yuxinxiao111@126.com
  • 作者简介:张永娥,女,1993年生,硕士研究生.主要从事水土保持研究.E-mail:1720365994@qq.com
  • 基金资助:
    本文由国家自然科学基金项目(41401013,41430747)资助

Foliar water use efficiency of Platycladus orientalis of different canopy heights in Beijing western mountains area, China

ZHANG Yong-e, YU Xin-xiao*, CHEN Li-hua, JIA Guo-dong, ZHANG Zhen-yao, SUN Li-bo, ZHANG Jie-ming, HOU Gui-rong   

  1. Ministry of Education Key Laboratory of Soil & Water Conservation and Desertification Combating, Beijing Forestry University, Beijing 100083, China
  • Received:2016-11-03 Revised:2017-04-10 Published:2017-07-18
  • Contact: *mail:yuxinxiao111@126.com
  • Supported by:
    Thiswork was supported by the National Natural Science Foundation of China (41401013, 41430747).

摘要: 以北京西山广泛分布的侧柏林为研究对象,综合考虑冠层不同高度处气象因子、大气CO2浓度以及大气CO2中碳同位素组成的差异,对其冠层不同高度处叶片的瞬时水分利用效率和短期水分利用效率分别进行了测定,以期为区域森林生态系统固碳与耗水研究提供理论依据,为区域森林生态系统经营与维护提供技术支撑.结果表明: 侧柏林冠层不同高度处叶片的瞬时水分利用效率随冠层高度的变化规律表现为上层>中层>下层,多种气象因子协同影响气孔运动,使瞬时水分利用效率受气孔限制;侧柏林冠层不同高度处的环境因子、大气CO2浓度以及大气CO2的δ13C均存在一定差异,导致了林冠各层叶片的短期水分利用效率的变化.林冠上层叶片通过提高水分利用效率适应环境.

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 instan-taneous 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.