Characteristics of the stem sap flux of Populus euphratica in the lower reaches of the Heihe River Basin, Northwest China

作     者：XiaoYou Zhang JianHua Si 

作者机构：Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences lanzhou Gansu 730000 China 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2009年第1卷第5期

页      面：458-466页

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：funded by the State Basic Research Planning Development Engineering-project (2009CB421303-2) the National Natural Science Foundation of China (40501012) the Knowledge Innovation Program from the Chinese Academy of Sciences (KZCX2-XB2-04) 

主　　题：sap flow Populus euphratica heat diffusion method environmental factors 

摘      要：Populus euphratica trees are the sole natural perennial riparian woodlands native to the river oases in the lower reaches of Heihe River Basin in northwestern *** study investigated characteristics of the stem sap flux of Populus euphratica and its rela-tionship to environmental factors using the thermal dissipation probe(TDP) *** results showed that(1) daily variation of sap flow of *** on clear days exhibited an obvious unimodal curve;sap flow rates in June,July,August,and September were 13.39,12.07,12.69,and 5.10 L/d,respectively;(2) the average transpiration of the Populus euphratica from June through September amounted to 1,309.84 L;(3) stem sap flow can be affected by a number of environmental factors that,in terms of the influential degree,can be arranged in the descending order of air temperature,soil moisture,relative humidity,total solar radiation,soil temperature,and wind velocity.