Monday, 21 March 2016

TREES ADAPT TO HIGHER TEMPERATURE BETTER THAN THOUGHT

Reuters, 16 March 2016

Alister Doyle

Trees can adapt to rising temperatures and limit their natural emissions of greenhouse gases, according to a study published on Wednesday that suggests plants may have a smaller than expected role in stoking man-made global warming.

Trees, plants, people and other animals produce carbon dioxide as a waste product from burning energy. As temperatures rise, trees use more energy in respiration and emit more carbon dioxide from their leaves.

“Plant respiration results in an annual flux of carbon dioxide to the atmosphere that is six times as large as that due to the emissions from fossil fuel burning, so changes in either will impact future climate,” scientists wrote in the journal Nature.

They found that 10 types of North American trees, in artificially heated outdoor forest plots, adapted to higher temperatures without drastically boosting the amount of carbon produced by their leaves.

“Plants play less of a role than previously thought in speeding up global warming through accelerated respiratory carbon dioxide emissions,” lead author Peter Reich of the University of Minnesota told an online news conference. “Given the number of plants on Earth this is a big deal,” he said of their role in the carbon cycle.

Apart from respiration, trees also absorb carbon dioxide to build roots, branches and leaves, and release it when they rot or burn. The study, and other experts, cautioned that the research only focused on respiration by leaves.

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