Elevated atmospheric CO 2 and humidity delay leaf fall in Betula pendula, but not in Alnus glutinosa or Populus tremula× tremuloidesReport as inadecuate




Elevated atmospheric CO 2 and humidity delay leaf fall in Betula pendula, but not in Alnus glutinosa or Populus tremula× tremuloides - Download this document for free, or read online. Document in PDF available to download.

1 BOKU - Institute of Forest Ecology, Universität für Bodenkultur 2 Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu 3 Department of Geography, Institute of Ecology and Earth Sciences 4 School of Ocean and Earth Science, National Oceanography Centre, Southampton, University of Southampton 5 School of Agriculture, Policy and Development, University of Reading 6 School of Environment, Natural Resources and Geography, Bangor University

Abstract : ContextAnthropogenic activity has increased the level of atmospheric CO2, which is driving an increase of global temperatures and associated changes in precipitation patterns. At Northern latitudes, one of the likely consequences of global warming is increased precipitation and air humidity.AimsIn this work, the effects of both elevated atmospheric CO2 and increased air humidity on trees commonly growing in northern European forests were assessed.MethodsThe work was carried out under field conditions by using Free Air Carbon dioxide Enrichment FACE and Free Air Humidity Manipulation FAHM systems. Leaf litter fall was measured over 4 years FACE or 5 years FAHM to determine the effects of FACE and FAHM on leaf phenology.ResultsIncreasing air humidity delayed leaf litter fall in Betula pendula, but not in Populus tremula × tremuloides. Similarly, under elevated atmospheric CO2, leaf litter fall was delayed in B. pendula, but not in Alnus glutinosa. Increased CO2 appeared to interact with periods of low precipitation in summer and high ozone levels during these periods to effect leaf fall.ConclusionsThis work shows that increased CO2 and humidity delay leaf fall, but this effect is species-specific.





Author: Douglas Godbold - Arvo Tullus - Priit Kupper - Jaak Sõber - Ivika Ostonen - Jasmin A. Godbold - Martin Lukac - Iftekhar U. Ahmed

Source: https://hal.archives-ouvertes.fr/



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