Sap flow response of Eucaylyptus (Eucalyptus urophyila) to environmental stress in South China

编号 zgly0000339307

文献类型 期刊论文

文献题名 Sap flow response of Eucaylyptus (Eucalyptus urophyila) to environmental stress in South China

学科分类 220.99;林学其他学科

作者 尹光彩  周国逸  MORRISJim  黄志宏  褚国伟  周光益 

作者单位 SouthChinaBotanicGarden  CAS  Guangzhou510650  China  CentreforForestTreeTechnology  Victoria3084  Australia  ResearchInstituteofTropicalForestry  CAF  Guangzhou510520  China 

母体文献 Journal of Zhejiang University Science;浙江大学学报: 自然科学英文版 

年卷期 2004,5(10)

页码 1218-1225

年份 2004 

分类号 S792.390.2  TH133.37 

关键词 SFD  VPD 

文摘内容 Sap flow and environmental conditions were monitored at two Eucalyptus (Eucalyptus urophylla S.T.Blake) plantations at Hetou and Jijia, located in Leizhou, Zhanjiang, Guangdong Province. It was found that daily sap flux density (SFD) of Eucalyptus was closely related to daily atmospheric vapor pressure deficit (VPD) (R^2=0.76, P=0.01 at Hetou and R^2=0.7021, P=0.01 at Jijia) at both sites. No significant relationship existed between daily SFD and mean daily air temperature at both sites. Daily SFD varied with wind speed Y=-17585X^3+15147X^2-1250.7X+2278.4 (R^2=0.68; P=0.01) at Hetou and Y=-101.67X^3-1.65X^2-376.4X+1914.8(R^2=0.40, P=0.05) at Jijia, where Ywas daily SFD, Xwas daily wind speed. Experimental observations yielded the following data: (1) the critical lower and upper daily VPD threshold were 0 and 2kPa, within which daily SFD varied from 540±70L/(m^2·d) to 4739±115L/(m^2·d) at Hetou site, from 397±26L/(m^2·d) to 3414±191L/(m^2·d) at Jijia site; (2) Diurnal SFDs at Hetou site were much higher under low relative humidity (<30%) and slightly lower under high relative humidity (>80%) compared with those at the Jijia site; (3) The upper and lower threshold of daily and diurnal RAD for the optimal water use of E. urophylla plantations were 18±2.7 and 2±1MJ/(m^2·d), 669 and 0J/(cm^2·h) during the observation period。