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

编号 zgly0000328210

文献类型 期刊论文

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

学科分类 220.99;林学其他学科

作者 ZHOUGuo-Yi  YINGuang-Cai  JimMORRIS  BAIJia-Yu  CHENShao-Xiong  CHUGuo-Wei  ZHANGNing-Nan 

作者单位 SouthChinaInstituteofBotany 

母体文献 Acta Botanica Sinica;植物学报: 英文版 

年卷期 2004,46(2)

页码 202-210

年份 2004 

分类号 S792.390.2 

关键词 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 

文摘内容 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。