As they grow the mo

As they grow, the more productive the tree and the more carbon it stores. Examining tree-ring data from Europe North America and parts of Asia between 1940 and 2008 (a time with reliable weather data) researchers discovered that in trees with at least 25 years’ worth of rings these layers were thinner than usual not just in years of droughts but on average for 3 or 4 years afterward Scientists had known droughts could damage tree tissues leaving a drought legacy but they didn’t know how long the legacy lasts As they report online today in Science trees growing in drier climates such as the US Southwest fared the worst "The study represents our best understanding of how long the trees need to recover after drought disturbances at a broad range" says Yongguang Zhang an ecosystems ecologist at the GFZ German Research Centre for Geosciences in Potsdam who was not involved with the work "Drought legacy effects will reduce our carbon storage in the future" Anderegg and his colleagues do not know what leads to the prolonged downturn in growth It could be that the hydraulic system plants use to pull water into leaves breaks down "It’s a big unknown in the field as to how much plants can repair their hydraulic systems" he notes Anderegg’s team also checked predictions made by computer programs that look at the big picture: climate warming caused by rising carbon dioxide levels The most sophisticated models factor in plant growth to calculate carbon storage potential but these models were inaccurate when it came to tree growth in the regions that Anderegg and his team studied "There’s a reasonably large disconnect between reality and the models" Anderegg says That’s a little worrisome says Milena Holmgren a plant ecologist at Wageningen University and Research Centre in the Netherlands who was not involved in the research "The paper shows that current climate-vegetation models are not able to reproduce the observed legacy effects and are therefore underestimating the effects of drought on vegetation and carbon cycling" A large population of nonfertile Megalomyrmex workers, whose function had been unclear.

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” Pandit said.

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