Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (2): 146–156.doi: 10.3724/SP.J.1226.2015.00146

• ARTICLES • 上一篇    

Water use measurement by non-irrigated Tamarix ramosissima in arid regions of Northwest China

Shuang Li1, HongLang Xiao2, YiBen Cheng2, Fang Wang2   

  1. 1. School of History and Tourism, Shaanxi University of Technology, Hanzhong, Shaanxi 723001, China;
    2. Key Laboratory of Ecohydrology of Inland River Basin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • 收稿日期:2014-03-05 修回日期:2014-08-20 发布日期:2018-11-23
  • 通讯作者: HongLang Xiao, Professor of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. E-mail: xhl@lzb.ac.cn E-mail:xhl@lzb.ac.cn

Water use measurement by non-irrigated Tamarix ramosissima in arid regions of Northwest China

Shuang Li1, HongLang Xiao2, YiBen Cheng2, Fang Wang2   

  1. 1. School of History and Tourism, Shaanxi University of Technology, Hanzhong, Shaanxi 723001, China;
    2. Key Laboratory of Ecohydrology of Inland River Basin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2014-03-05 Revised:2014-08-20 Published:2018-11-23
  • Contact: HongLang Xiao, Professor of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. E-mail: xhl@lzb.ac.cn E-mail:xhl@lzb.ac.cn

摘要: Tamarix ramosissima Ledeb. is a typical hardy desert plant growing in arid regions of Northwest China. Sap flow in stems of T. ramosissima plants were measured continuously to determine the diurnal and seasonal variations of sap flow and to understand the water requirements of this species and the response of sap flow to meteorological factors. This article compared the sap flow rate measured by the heat balance method with the transpiration rate measured by rapid weighing, and validated that heat balance sap flow gauges were reliable for monitoring transpiration. The influence of meteorological factors on stem sap flow during the growing season was: solar radiation > vapor pressure deficit > air temperature > relative humidity > wind speed. Bidirectional sap flows occurred at night, and negative sap flow generally corresponded to high atmospheric humidity. The average error in predicted sap flow rate ranged from -0.78% to 14.00% from June to September and for transpiration the average error was 8.19%. Therefore, based on the functional equations between sap flow and meteorological factors as well as sapwood area, transpiration of an individual plant, and even the stand-level transpiration, can be estimated accurately through extrapolation.

关键词: Tamarix ramosissima Ledeb., heat balance method, sap flow, transpiration, meteorological factors

Abstract: Tamarix ramosissima Ledeb. is a typical hardy desert plant growing in arid regions of Northwest China. Sap flow in stems of T. ramosissima plants were measured continuously to determine the diurnal and seasonal variations of sap flow and to understand the water requirements of this species and the response of sap flow to meteorological factors. This article compared the sap flow rate measured by the heat balance method with the transpiration rate measured by rapid weighing, and validated that heat balance sap flow gauges were reliable for monitoring transpiration. The influence of meteorological factors on stem sap flow during the growing season was: solar radiation > vapor pressure deficit > air temperature > relative humidity > wind speed. Bidirectional sap flows occurred at night, and negative sap flow generally corresponded to high atmospheric humidity. The average error in predicted sap flow rate ranged from -0.78% to 14.00% from June to September and for transpiration the average error was 8.19%. Therefore, based on the functional equations between sap flow and meteorological factors as well as sapwood area, transpiration of an individual plant, and even the stand-level transpiration, can be estimated accurately through extrapolation.

Key words: Tamarix ramosissima Ledeb., heat balance method, sap flow, transpiration, meteorological factors

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