Local workers at the field station in Sabah, Malaysia, helped prepare the 1,400 pots and saplings for the experiment.
Photo: © Michael O'Brien/UZH

Carbohydrates boost trees' drought survival chances

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. 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 forest decline on a global scale. An international research team headed by Michael O’Brien, an ecologist at the University of Zurich, Switzerland, is studying which factors govern the resistance of tropical trees to periods of drought. As the scientists reveal in their study published in June in Nature Climate Change, stored carbohydrates play a key role in the resilience of an individual plant.

 

1,400 saplings of ten species monitored

 

While stored starch and soluble sugar in plant tissues were thought to influence the resistance and resilience of trees positively during periods of drought, this supposition had not been proven. 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,” conclude the scientists in this study.

 

Carbohydrate content different in every tree species

According to O’Brian, the ability to store carbohydrates varies both within and between species: “As different trees display a different mortality due to aridity, the impact of a forest decline triggered by climate change is cushioned,” O’Brien is convinced. These new insights are also significant for reforestation: The planting of species that store more carbohydrates can be favoured in order to boost a forest’s resistance to the drier climates predicted by climate change models.

 

(UZH/wi)

Literature:

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