Publication

Ecological response of trees to simulated climate change along an altitudinal gradient (CLIMARBRE)

Alexandre Buttler
2014
Posters

Abstract

Assessing the impacts of climate change on mountain ecosystems is challenging as it takes several decades to observe an ecological response. Using a transplantation experiment in the Swiss Jura Mountains we study the adaptability of beech and spruce to simulated climate change. In situ ecophysiological measures, e.g. photosynthetic rate at a constant CO2 partial pressure, were undertaken to assess the performance of saplings. Moreover, leaf phenology and growth rate monitoring were performed during the growing season. The main findings include a clear altitudinal effect on growth and photosynthetic capacity of both species and an advanced leaf flushing at lower altitudes.

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https://infoscience.epfl.ch/entities/publication/f4ade08c-0b0d-4d7e-bf5d-6f9b201d2ed1

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Alexandre Buttler
2014
Posters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f4ade08c-0b0d-4d7e-bf5d-6f9b201d2ed1

About this result

Related concepts (32)

Photosynthesis

Photosynthesis (ˌfoʊtəˈsɪnθəsɪs ) is a biological process used by many cellular organisms to convert light energy into chemical energy, which is stored in organic compounds that can later be metabolized through cellular respiration to fuel the organism's activities. The term usually refers to oxygenic photosynthesis, where oxygen is produced as a byproduct, and some of the chemical energy produced is stored in carbohydrate molecules such as sugars, starch and cellulose, which are synthesized from endergonic reaction of carbon dioxide with water.

Compensation point

The light compensation point (Ic) is the light intensity on the light curve where the rate of photosynthesis exactly matches the rate of cellular respiration. At this point, the uptake of CO2 through photosynthetic pathways is equal to the respiratory release of carbon dioxide, and the uptake of O2 by respiration is equal to the photosynthetic release of oxygen. The concept of compensation points in general may be applied to other photosynthetic variables, the most important being that of CO2 concentration – CO2 compensation point (Γ).

Photosynthetically active radiation

Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye. Photons at shorter wavelengths tend to be so energetic that they can be damaging to cells and tissues, but are mostly filtered out by the ozone layer in the stratosphere.

Related publications (11)

Ecological response of trees to simulated climate change along an altitudinal gradient (CLIMARBRE)

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