by Staff Writers
Zurich, Switzerland (SPX) Jul 03, 2014
How well tropical trees weather periods of drought depends on the carbohydrates stored, as revealed by a novel experiment conducted by an international team of researchers headed by ecologists from the University of Zurich in contribution to the University Research Priority Program on "Global Change and Biodiversity". The findings are extremely important for assessing the resistance of tropical forests to climate change and reforestation.
Water is the limiting factor for many plants and trees. Consequently, there are grave concerns that the rainfall patterns altered by climate change could trigger a forest decline on a global scale. According to climate researchers, Switzerland is also affected: The climate models even project hotter and drier summers for this country.
An international research team headed by Michael O'Brien, an ecologist at the University of Zurich, is now studying which factors govern the resistance of tropical trees to periods of drought. As the scientists reveal in their study published in Nature Climate Change, stored carbohydrates play a key role in the resilience of the individual plant.
1,400 saplings of ten species monitored
O'Brien and his team planted 1,400 saplings of ten different tropical tree species in Malaysia and devised a novel experiment to manipulate the carbohydrates stored and observe their reaction.
The researchers increased or decreased the concentration of stored carbohydrates and exposed the seedlings to an artificial drought period. It became clear that young trees with more stored carbohydrates were able to maintain the vital water content in the stem for longer than those with fewer stored carbohydrates.
"The better drought resistance and thus the greater chance of surviving a period of drought evidently depends on the quantity of carbohydrates stored," concludes O'Brien.
Carbohydrate content different in every tree species
Michael J. O'Brien, Sebastian Leuzinger, Christopher D. Philipson, John Tay and Andy Hector, Drought survival of tropical tree seedlings enhanced by non-structural carbohydrate level. Nature Climate Change, June 29, 2014. DOI:10.1038/nclimate2281
University of Zurich
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