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应用生态学报 ›› 2009, Vol. 20 ›› Issue (09): 2111-2117.

• 研究报告 • 上一篇    下一篇

北京城区常见树种生长季树干液流的时滞特征

王华1;欧阳志云1;郑华1;王效科1;倪永明2;任玉芬1   

  1. 1中国科学院生态环境研究中心城市与区域生态国家重点实验室| 北京 100085;2北京自然博物馆, 北京 100050
  • 收稿日期:2009-02-19 出版日期:2009-09-20 发布日期:2009-09-20

Time lag characteristics of stem sap flow of common tree species during their growth season in Beijing downtown.

WANG Hua1;OUYANG Zhi-yun1;ZHENG Hua1;WANG Xiao-ke1;NI Yong-ming2;REN Yu-fen1   

  1. 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China|2Beijing Museum of Natural History, Beijing 100050, China
  • Received:2009-02-19 Online:2009-09-20 Published:2009-09-20

摘要: 2008年4—9月,应用热消散技术测定了北京市常见树种银杏、七叶树、玉兰、刺槐、油松、雪松的树干液流,并将液流与总辐射和水汽压亏缺数据进行逐行错位分析,探讨不同树种树干液流与蒸腾驱动因子之间的时滞效应.结果表明:6个树种树干液流(Js)的变化与总辐射(Rs)和水汽压亏缺(D)显著相关,且Js均滞后于Rs,提前于DJsRs之间最大相关系数(0.74~0.93)通常比JsD之间最大相关系数(0.57~0.79)高,表明日尺度上Js在很大程度上依赖于Rs的变化.除油松外,其他树种JsRs之间时滞范围(10~70 min)比JsD之间时滞范围(47~130 min)短,其中刺槐、油松和雪松种间差异显著;城市树种Js与蒸腾驱动因子之间的时滞主要受树形(胸径、树高、冠层投影面积、边材面积)以及夜间水分补充量的影响,而与树种无关.

关键词: 城市树种, 热消散探针法, 树干液流, 时滞, 氧化亚氮, 本土排放因子, 畜禽粪便, 空间格局, 不确定性估计

Abstract: From April to September in 2008, the stem sap flow velocity (Js) of se
veral common tree species (Ginkgo biloba, Aesculus chinensis, Magnolia denudata,
 Robinia pseudoacacia, Pinus tabulaeformis and Cedrus deodara) in Beijing was m
easured by thermal dissipation method. Cross-correlation analysis was used to e
stimate the time lag between the stem sap flow and the driving factors of canopy
 transpiration among the tree species. The Js of the six tree species was
significantly correlated with the total radiation (Rs) and vapor pressure
deficit (D), and the Js was lagged behind Rs but ahead of D.
 The maximum correlation coefficient of Js with Rs (074〖KG-*2〗-
〖KG-*7〗093) was often higher than that of Js with D (057〖KG-*2
〗-〖KG-*7〗079), indicating that the diurnal Js was more dependent on
Rs than on D. The sampled tree species except P. tabulaeformis had a
shorter time lag of Js with Rs (10〖KG-*2〗-〖KG-*7〗70 min)
than with D (47〖KG-*2〗-〖KG-*7〗130 min), and there existed significant di
fferences among R. pseudoacacia, P. tabulaeformis, and C. deodara. The t
ime lag between the Js and the driving factors of canopy transpiration was
 mainly correlated with the tree features (DBH, tree height, canopy area, and sa
pwood area) and the nocturnal water recharge, regardless of tree species.

Key words: urban tree species, thermal dissipation method, stem sap flow, time lag, nitrous oxide, localized emission factor, manure, spatial pattern, uncertainty estimation