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Citation:

Stem Sap Flow Characteristics of Acacia auriculaeformis in Dry-hot Valley and Their Relations to Meteorological Factors

  • Received Date: 2012-10-12
  • The thermal dissipation probes(TDP) were applied to measure the sap flow of Acacia auriculaeformis in dry and wet seasons in Yuanmou dry-hot valley, southwest China. The meteorological factors such as photosynthetic active radiation(PAR), air temperature(T), relative humidity(RH), water vapor pressure deficit(VPD) and wind speed were measured at the same time. The diurnal, seasonal variation of liquid flow rate and its relationship with meteorological factors were analyzed. The results indicated: (1)The diurnal variation of sap flow displayed a typical single-peaked curve during the wet and dry seasons. (2)The value of sap flow velocities in south side was higher than that in the north side. (3)There were obviously difference between the wet season and the dry season in the mean and the maximal value of sap flow velocities. The mean and the maximal values of sap flow velocities in wet season were 2.8 and 2.5 times that in dry season. (4)The sap-flow velocity was significantly correlated with PAR, air temperature and VPD and was negatively correlated with the atmospheric relative humidity. The ranking of correlation coefficients was PAR>air temperature>VPD>relative humidity>wind speed. The dominant factors were PAR, RH, and VPD.
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Stem Sap Flow Characteristics of Acacia auriculaeformis in Dry-hot Valley and Their Relations to Meteorological Factors

  • 1. Department of Environmental Science and Engineering, Southwest Forestry University, Kunming 650224, Yunnan, China
  • 2. Research Institute of Insect Resources, Chinese Academy of Forestry, Kunming 650224, Yunnan, China

Abstract: The thermal dissipation probes(TDP) were applied to measure the sap flow of Acacia auriculaeformis in dry and wet seasons in Yuanmou dry-hot valley, southwest China. The meteorological factors such as photosynthetic active radiation(PAR), air temperature(T), relative humidity(RH), water vapor pressure deficit(VPD) and wind speed were measured at the same time. The diurnal, seasonal variation of liquid flow rate and its relationship with meteorological factors were analyzed. The results indicated: (1)The diurnal variation of sap flow displayed a typical single-peaked curve during the wet and dry seasons. (2)The value of sap flow velocities in south side was higher than that in the north side. (3)There were obviously difference between the wet season and the dry season in the mean and the maximal value of sap flow velocities. The mean and the maximal values of sap flow velocities in wet season were 2.8 and 2.5 times that in dry season. (4)The sap-flow velocity was significantly correlated with PAR, air temperature and VPD and was negatively correlated with the atmospheric relative humidity. The ranking of correlation coefficients was PAR>air temperature>VPD>relative humidity>wind speed. The dominant factors were PAR, RH, and VPD.

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