Measured Sap Flow and Estimated Evapotranspiration of Tropical Eucalyptus urophylla Plantations in South China

作     者：ZHOUGuo-Yi YINGuang-Cai JimMORRIS BAIJia-Yu CHENShao-Xiong CHUGuo-Wei ZHANGNing-Nan 

作者机构：SouthChinaInstituteofBotanyTheChineseAcademyofSciencesGuangzhou510650Chinat CenterforForestTreeTechnologyP.O.Box137HeidelbergVictoria3084Australia ResearchInstituteofTropicalForestryChineseAcademyofForestryGuangzhou510520China ChinaEucalyptusResearchandDevelopmentCenterChineseAcademyofForestryZhanjiang524022China 

出 版 物：《Acta Botanica Sinica》 (Acta Botanica Sinica（植物学报：英文版）)

年 卷 期：2004年第46卷第2期

页      面：202-210页

核心收录：

学科分类：0710[理学-生物学] 0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 

基　　金：中国科学院知识创新工程重要方向项目 国家973计划 中国科学院海外杰出学者基金 广东省自然科学基金重点项目 

主　　题：桉树人工林 水分消耗 树液流通量密度 SFD 空气饱和差 VPD 蒸腾作用 蒸散作用 

摘      要：During the period of September 12, 1999 to September 24, 2000, we measured sap flow ofeucalyptus (Euca/yptus urophylla S.T. Blake) plantations using heat pulse technique, and the relevantenvironmental vaiables, such as soil evaporation and canopy interception, etc, at Hetou and Jijia sites,Leizhou Peninsula, Guangdong Province. Based on the measurements of sap flow and estimates ofevapotranspiration, the following can be concluded: (1) the maximum of diurnal xylem sap flux density (SFD)at Hetou, where covered with coarse-textured soils formed on Quaternary sediments, was almost twice ofthat at Jijia, where located on clay-rich soils derived from basalt; (2) SFD was highly correlated to watervapor pressure deficit (VPD) of ambient air near the canopy layer, (3) the correlation between SFD and airtemperature also depends on soil properties and soil water potential; (4) the relative differences betweenmeasured and modeled evapotranspiration were small, being 5.26% at Hetou and 6.14% at Jijia; (5) theplantation transpiration accounted for 62.2% and 51.3% of the evapotranspiration at Hetou and Jijia,respectively; and (6) the averaged SFD per unit leaf area (ASPULA) was a good index to estimate theamount of water consumption of tree species.