World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Topography Induced Spatial Variations in Diurnal Cycles of Assimilation and Latent Heat of Mediterranean Forest : Volume 4, Issue 1 (22/02/2007)

By Van Der Tol, C.

Click here to view

Book Id: WPLBN0003991990
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Topography Induced Spatial Variations in Diurnal Cycles of Assimilation and Latent Heat of Mediterranean Forest : Volume 4, Issue 1 (22/02/2007)  
Author: Van Der Tol, C.
Volume: Vol. 4, Issue 1
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Dolman, A. J., Waterloo, M. J., Der Tol, C. V., & Raspor, K. (2007). Topography Induced Spatial Variations in Diurnal Cycles of Assimilation and Latent Heat of Mediterranean Forest : Volume 4, Issue 1 (22/02/2007). Retrieved from

Description: Dept. of Hydrology and Geo-Environmental Sciences, Vrije Universiteit Amsterdam, The Netherlands. The aim of this study is to explain topography induced spatial variations in the diurnal cycles of assimilation and latent heat of Mediterranean forest. Spatial variations of the fluxes are caused by variations in weather conditions and in vegetation characteristics. Weather conditions reflect short-term effects of climate, whereas vegetation characteristics, through adaptation and acclimation, long-term effects of climate. In this study measurements of plant physiology and weather conditions are used to explain observed differences in the fluxes. A model is used to study which part of the differences in the fluxes is caused by weather conditions and which part by vegetation characteristics. Data were collected at four experimental sub-Mediterranean deciduous forest plots in a heterogeneous terrain with contrasting aspect, soil water availability, humidity and temperature. We used a sun-shade model to scale fluxes from leaf to canopy, and calculated the canopy energy balance. Parameter values were derived from measurements of light interception, leaf chamber photosynthesis, leaf nitrogen content and 13C isotope discrimination in leaf material. Leaf nitrogen content is a measure of photosynthetic capacity, and 13C isotope discrimination of water use efficiency. For validation, sap-flux based measurements of transpiration were used. The model predicted diurnal cycles of transpiration and stomatal conductance, both their magnitudes and differences in afternoon stomatal closure between slopes of different aspect within the confidence interval of the validation data. Weather conditions mainly responsible for the shape of the diurnal cycles, and vegetation parameters for the magnitude of the fluxes. Although the data do not allow for a quantification of the two effects, the differences in vegetation parameters and weather among the plots and the sensitivity of the fluxes to them suggest that the diurnal cycles were more strongly affected by spatial variations in vegetation parameters than by meteorological variables. This indicates that topography induced variations in vegetation parameters are of equal importance to the fluxes as topography induced variations in radiation, humidity and temperature.

Topography induced spatial variations in diurnal cycles of assimilation and latent heat of Mediterranean forest

Arneth, A., Lloyd, J., \vSantr\.u\vcková, H., Bird, M., Grigoryev, S., Kalschnikov, Y., Gleixner, G., and Schulze, E.-D.: Response of central Siberian Scots pine to soil water deficit and long-term trends in atmospheric CO2 concentration, Global Biochem. Cycles, 16, 5/1–5/13, \doi10.1029/2000GB001374, 2002.; Campbell, G.: Extinction coefficients for radiation in plant canopies calculated using an ellipsoidal inclination angle distribution, Agric. For. Meteorol., 36, 317–321, 1986.; Cowan, I.: Stomatal behaviour and environment, Adv. Bot. Res., 4, 117–228, 1977.; Cowan, I.: Economics of carbon fixation in higher plants, in: On the economy of plant form and function, edited by: Givnish, T. J., Cambridge University Press, Cambridge, UK, pp 133–170, 1986.; Cowan, I. and Farquhar, G.: Stomatal function in relation to leaf metabolism and environment, Soc. Exp. Biol. Symp., 31, 471–505, 1977.; Damesin, C. and Rambal, S.: Field study of leaf photosynthetic performance by a Mediterranean deciduous oak tree (Quercus pubescens) during a severe summer drought, New Phytol., 131, 159–167, \doi10.1111/j.1469-8137.1995.tb05717.x, 1995.; Farquhar, G. and Sharkey, T.: Stomatal Conductance and Photosynthesis, Ann. Rev. Plant. Physiol., 33, 317–345, \doi10.1146/annurev.pp.33.060182.001533, 1982.; De Pury, D. and Farquhar, G.: Simple scaling of photosynthesis from leaves to canopies without the errors of big-leave models, Plant Cell Environ., 20, 237–557, 1997.; Farquhar, G. and Richards, R.: Isotopic composition of plant carbon correlates with water-use efficiency of what genotypes, Austr. J. Plant Physiol., 11, 191–210, 1984.; Farquhar, G., von Caemmerer, S., and Berry, J.: A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species, Planta, 149, 78–90, 1980.; Farquhar, G., O'Leary, M., and Berry, J.: On the relationship between carbon isotope discrimination and the intercellular carbon dioxide concentration in leaves, Austr. J. Plant Physiol., 9, 121–137, 1982.; Farquhar, G., Ehleringer, J., and Hubick, K.: Carbon isotope discrimination and photosynthesis, Annu. Rev. Plant Physiol. Plant Mol. Biol., 40, 503–537, 1989.; Field, C. and Mooney, H.: The photosynthesis-nitrogen relationship in wild plants, in: On the Economy of Plant Form and Function, edited by: Givnish, T. J., Cambridge University Press, Cambridge, UK, pp 25–55, 1986.; Granier, A.: Mesure du flux de sève brute dans le tronc du Douglas par une nouvelle méthode thermique, Ann. Sci. Forest, 44, 1–14, 1987.; Harley, P. and Baldocchi, D.: Scaling carbon dioxide and water vapour exchange from leaf to canopy in a deciduous forest. I. Leaf model parameterization, Plant Cell Environ., 18, 1146–1156, 1995.; Hetherington, A. and Woodward, F.: The role of stomata in sensing and driving environmental change, Nature, 424, 901–908, 2003.; Jones, H.: Stomatal control of photosynthesis and transpiration, J. Expl. Bot., 49, 387–398, 1998.; Keesstra, S.: The effects of natural reforestation on the hydrology, river morphology and sediment budget of the Dragonja catchment in SW Slovenia, Ph.D. thesis, Vrije Universiteit Amsterdam, The Netherlands, 2006.; Lambers, H., Stuart Chapin III, F., and Pons, T.: Plant Physiological Ecology, Springer Verlag, New York, 2000.; Leuning, R.: A critical appraisal of a combined stomatal-photoynthesis model for C3 plants, Plant Cell Environ., 18, 339–355, 1995.; Leuning, R., Kelliher, F., Pury, D D., and Schulze, E D.: Leaf nitrogen, photosynthesis, conductance and transpiration: scaling from leaves to canopies, Plant Cell Environ., 18, 1183–1200, 1995.; Lloyd, J. and Farquhar, G.: 13C discrimination during CO2 assimilation by the terrestrial biosphere, Oecologia, 99, 201


Click To View

Additional Books

  • The Benefits of Emergency Rescue and Rea... (by )
  • Lead, Zinc, and Chromium Concentrations ... (by )
  • A Spatial Investigation of the Environme... (by )
  • Sensors for Physical Fluxes at the Sea S... (by )
  • Possible Source of Ancient Carbon in Phy... (by )
  • Transactions of the annual meetings of t... (by )
  • Transactions and Proceedings and Report ... Volume: v.2, 1878-1879 (by )
  • Journal of the Kentucky Academy of Scien... Volume: v. 65 :no. 1 (2004: spring) (by )
  • A New 3-d-modelling Method to Extract Su... (by )
  • Field 13Co2 Pulse Labeling Reveals Diffe... (by )
  • Influence of Intense Scavenging on Pa-th... (by )
  • Coupling Δ2H and Δ18O Biomarker Results ... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.