A simulation of the importance of length of growing season and canopy functional properties on the seasonal gross primary production of temperate alpine meadows

Annals of Botany
Florence Baptist, Philippe Choler

Abstract

Along snowmelt gradients, the canopies of temperate alpine meadows differ strongly in their structural and biochemical properties. Here, a study is made of the effects of these canopy dissimilarities combined with the snow-induced changes in length of growing season on seasonal gross primary production (GPP). Leaf area index (LAI) and community-aggregated values of leaf angle and leaf nitrogen content were estimated for seven alpine plant canopies distributed along a marked snowmelt gradient, and these were used as input variables in a sun-shade canopy bulk-photosynthesis model. The model was validated for plant communities of early and late snowmelt sites by measuring the instantaneous CO(2) fluxes with a canopy closed-chamber technique. A sensitivity analysis was conducted to estimate the relative impact of canopy properties and environmental factors on the daily and seasonal GPP. Carbon uptake was primarily related to the LAI and total canopy nitrogen content, but not to the leaf angle. For a given level of photosynthetically active radiation, CO(2) assimilation was higher under overcast conditions. Sensitivity analysis revealed that increase of the length of the growing season had a higher effect on the seasonal GPP than a ...Continue Reading

References

Apr 23, 2004·Nature·Ian J WrightRafael Villar
Jun 29, 2004·Proceedings of the National Academy of Sciences of the United States of America·Peter B ReichJared Trost

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Citations

Jul 21, 2009·Applied and Environmental Microbiology·L ZingerR A Geremia
May 3, 2014·Alpine Botany·Bradley Z CarlsonPhilippe Choler
Aug 16, 2018·Frontiers in Plant Science·Daniel E WinklerLara M Kueppers

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