World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

The Importance of Micrometeorological Variations for Photosynthesis and Transpiration in a Boreal Coniferous Forest : Volume 11, Issue 8 (20/08/2014)

By Schurgers, G.

Click here to view

Book Id: WPLBN0004004663
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: The Importance of Micrometeorological Variations for Photosynthesis and Transpiration in a Boreal Coniferous Forest : Volume 11, Issue 8 (20/08/2014)  
Author: Schurgers, G.
Volume: Vol. 11, Issue 8
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Lagergren, F., Lindroth, A., Mölder, M., & Schurgers, G. (2014). The Importance of Micrometeorological Variations for Photosynthesis and Transpiration in a Boreal Coniferous Forest : Volume 11, Issue 8 (20/08/2014). Retrieved from http://ebook2.worldlibrary.net/


Description
Description: Lund University, Dept. of Physical Geography and Ecosystem Science, Lund, Sweden. Plant canopies affect the canopy micrometeorology, and thereby alter canopy exchange processes. For the simulation of these exchange processes on a regional or global scale, large-scale vegetation models often assume homogeneous environmental conditions within the canopy. In this study, we address the importance of vertical variations in light, temperature, CO2 concentration and humidity within the canopy for photosynthesis and transpiration of a boreal coniferous forest in central Sweden. A leaf-level photosynthesis-stomatal conductance model was used for aggregating these processes to canopy level while applying the within-canopy distributions of these driving variables.

The simulation model showed good agreement with eddy covariance-derived gross primary production (GPP) estimates on daily and annual timescales, and showed a reasonable agreement between transpiration and observed H2O fluxes, where discrepancies are largely attributable to a lack of forest floor evaporation in the model. Simulations in which vertical heterogeneity was artificially suppressed revealed that the vertical distribution of light is the driver of vertical heterogeneity. Despite large differences between above-canopy and within canopy humidity, and despite large gradients in CO2 concentration during early morning hours after nights with stable conditions, neither humidity nor CO2 played an important role for vertical heterogeneity of photosynthesis and transpiration.


Summary
The importance of micrometeorological variations for photosynthesis and transpiration in a boreal coniferous forest

Excerpt
Alton, P. B., North, P. R., and Los, S. O.: The impact of diffuse sunlight on canopy light-use efficiency, gross photosynthetic product and net ecosystem exchange in three forest biomes, Glob. Change Biol., 13, 776–787, doi:10.1111/j.1365-2486.2007.01316.x, 2007.; Arx, G. V., Dobbertin, M., and Rebetez, M.: Spatio-temporal effects of forest canopy on understory microclimate in a long-term experiment in Switzerland, Agr. Forest Meteorol., 166–167, 144–155, doi:10.1016/j.agrformet.2012.07.018, 2012.; Aubinet, M., Berbigier, P., Bernhofer, C., Cescatti, A., Feigenwinter, C., Granier, A., Grünwald, T., Havrankova, K., Heinesch, B., Longdoz, B., Marcolla, B., Montagnani, L., and Sedlak, P.: Comparing CO2 storage and advection conditions at night at different Carboeuroflux sites, Bound.-Lay. Meteorol., 116, 63–93, doi:10.1007/s10546-004-7091-8, 2005.; Baldocchi, D. D. and Wilson, K. B.: Modeling CO2 and water vapor exchange of a temperate broadleaved forest across hourly to decadal time scales, Ecol. Model., 142, 155–184, doi:10.1016/S0304-3800(01)00287-3, 2001.; Ball, J., Woodrow, I. E., and Berry, J. A.: A model predicting stomatal conductance and its contribution to the control of photosynthesis under different environmental conditions, in: Progress in Photosynthesis Research IV, edited by: Biggens, J., 221–224, Martinus Nijhoff Publishers, 1987.; Brooks, J. R., Flanagan, L. B., Varney, G. T., and Ehleringer, J. R.: Vertical gradients in photosynthetic gas exchange characteristics and refixation of respired CO2 within boreal forest canopies, Tree Physiol., 17, 1–12, 1997.; Goudriaan, J.: Crop micrometeorology: a simulation study, Pudoc, Wageningen, 1977.; Buchmann, N., Kao, W.-Y., and Ehleringer, J. R.: Carbon dioxide concentrations within forest canopies – variation with time, stand structure, and vegetation type, Glob. Change Biol., 2, 421–432, 1996.; Čermák, J., Deml, M., and Penka, M.: A new method of sap flow rate determination in trees, Biol. Plantarum, 15, 171–178, 1973.; Collatz, G., Ball, J., Grivet, C., and Berry, J. A.: Physiological and environmental regulation of stomatal conductance, photosynthesis and transpiration: a model that includes a laminar boundary layer, Agr. Forest Meteorol., 54, 107–136, doi:10.1016/0168-1923(91)90002-8, 1991.; Cowan, I. R.: The interception and absorption of radiation in plant stands, J. Appl. Ecol., 5, 367–379, doi:10.2307/2401567, 1968.; De Pury, D. G. G., and Farquhar, G. D.: Simple scaling of photosynthesis from leaves to canopies without the errors of big-leaf models, Plant Cell Environ., 20, 537–557, 1997.; Dengel, S. and Grace, J.: Carbon dioxide exchange and canopy conductance of two coniferous forests under various sky conditions., Oecologia, 164, 797–808, doi:10.1007/s00442-010-1687-0, 2010.; Duncan, W., Loomis, R., Williams, W., and Hanau, R.: A model for simulating photosynthesis in plant communities, Hilgardia, 38, 181–205, 1967.; Ellsworth, D. S. and Reich, P. B.: Canopy structure and vertical patterns of photosynthesis and related leaf traits in a deciduous forest, Oecologia, 96, 169–178, 1993.; Falge, E., Ryel, R. J., Alsheimer, M., and Tenhunen, J. D.: Effects of stand structure and physiology on forest gas exchange: a simulation study for Norway spruce, Trees, 11, 436–448, 1997.; Givnish, T. J.: Adaptation to sun and shade: a whole-plant perspective, Aust. J. Plant Physiol., 15, 63–92, 1988.; Farquhar, G. D., Caemmerer, S.

 

Click To View

Additional Books


  • Redox Regime Shifts in Microbially-media... (by )
  • Mangroves Facing Climate Change: Landwar... (by )
  • Controls on the Spatial Distribution of ... (by )
  • Colored Dissolved Organic Matter in Shal... (by )
  • Estimation of Microbial Metabolism and C... (by )
  • Temporal Biomass Dynamics of an Arctic P... (by )
  • Soil Respiration Compartments on an Agin... (by )
  • Ocean Acidification Does Not Affect Magn... (by )
  • Mechanism for Initiation of the Offshore... (by )
  • Diel Variability of Heterotrophic Bacter... (by )
  • Variations in Leaf Physiological Propert... (by )
  • Relationship Between N : P : Si Ratio an... (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.