| 摘要(英) |
It is well know that plant transpiration and sap flow are influenced by the environmental parameters, such as wind, solar radiation, soil moisture, vapor pressure deficit and temperature. This study used the Granier-type heat dissipation sensors to investigate the transient response of sap flow on two plant species: Pachira macrocarpa and Messerschmidia argentea (L.). The results of wind speed and blackout experiments revealed that the transient responses of sap flow of these two plants could be described by the resistance-capacitance model of Phillips et al. (2004). But the time constant and steady sap flow velocity were dependent on the location on the sensors. For Pachira macrocarpa, the time constant Tc of lower height on the stem is smaller than that of higher height, and the steady sap flow velocity Vs at lower height is larger than that of higher height. It was also found that under the same wind speed, the sap flow velocity of plant in under-saturated soil is smaller than that of in saturated soil, but the time constants of well-watered plant and plant in under-saturated soil are about the same. The experimental results of branch autonomy demonstrated that the branches react independently to the change of environmental parameter.
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| 參考文獻 |
Chu C.R., Hsieh C.I., Wu S.Y., Phillips N.G. 2009. Transient response of sap flow to wind speed. Journal of Experimental Botany, 60 (1), 249-255.
Gibert D., Mouël Jean-Louis L., Lambs L., Nicollin F., Perrier F. 2006. Sap flow and daily electric potential variations in a tree trunk. Plant Science, 171, 572-584.
Granier A. 1985. Une nouvelle me'thode pour la mesure du flux de se`ve brute dans le tronc des arbres. Annales des Sciences Forestieres, 42, 193-200.
Granier A. 1987. Evaluation of transpiration in a Douglas-fir stand by means of sap-flow measurements. Tree Physiology, 3, 309-320.
Hunt E.R. and Nobel, P.S. 1987. Non-steady-state water flow for three desert perennials with different capacitances. Australian Journal of Plant Physiology, 14, 363-375.
Jones H.G. 1992. Plants and Microclimate: A quantitative approach to environmental plant physiology. Cambridge University Press, pp. 428.
Phillips N.G., Nagchaudhuri A., Oren R., Katul G. 1997. Time constant for water transport in loblolly pine trees estimated from time series of evaporative demand and stem sapflow, Trees – Structure and Function, 11, 412-419.
Phillips N.G., Oren R., Licata J., Linder S. 2004. Time series diagnosis of tree hydraulic characteristics, Tree Physiology, 24, 879-890.
Sprugel D.G., Hinckley T.M., Scgaap W. 1991. The theory and practice of branch autonomy, Annual Review of Ecol. System, 22, 309-334.
Steppe K., Lemeur R., Samson R. 2002. Sap flow dynamics of a beech tree during the solar eclipse of 11 August 1999, Agricultural and Forest Meteorology, 112, 139-149.
Wilson K.B., Hanson P.J., Mulholland P.J., Baldocchi D.D. Wullschleger S.D. 2006. A comparison of methods for determining forest evapotranspiration and its components: sap-flow, soil water budget, eddy covariance and catchment water, Agricultural and Forest Meteorology, 106, 153-168.
Wu S.Y. 2008. Use sap flow sensor to investigate the influence of environmental parameters on plant transpiration, M.S. Thesis of Department of Civil Engineering, National Central University (in Chinese).
Wullschleger S.D., Meinzer F.C., Vertessy R.A. 1998. A review of whole plant water use studies in trees, Tree Physiology, 18, 499-512.
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