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Twentieth century redistribution in climatic drivers of global tree growth

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Citation

Babst, F., Bouriaud, O., Poulter, B., Trouet, V., Girardin, M. P., & Frank, D. C. (2019). Twentieth century redistribution in climatic drivers of global tree growth. Science Advances, 5(1): eaat4313. doi:10.1126/sciadv.aat4313.


Cite as: https://hdl.handle.net/21.11116/0000-0002-D627-1
Abstract
Energy and water limitations of tree growth remain insufficiently understood at large spatiotemporal scales, hindering
model representation of interannual or longer-term ecosystemprocesses. By assessing and statistically scaling the climatic
drivers from2710 tree-ring sites, we identified the boreal and temperate land areas where tree growth during 1930–1960
CE responded positively to temperature (20.8 ± 3.7Mio km2; 25.9 ± 4.6%), precipitation (77.5 ± 3.3Mio km2; 96.4 ± 4.1%),
and other parameters. The spatial manifestation of this climate response is determined by latitudinal and altitudinal
temperature gradients, indicating that warming leads to geographic shifts in growth limitations. We observed a significant
(P < 0.001) decrease in temperature response at cold-dry sites between 1930–1960 and 1960–1990 CE, and the
total temperature-limited area shrunk by −8.7 ± 0.6 Mio km2. Simultaneously, trees became more limited by atmosphericwater
demand almost worldwide. These changes occurred under mild warming, andwe expect that continued
climate change will trigger a major redistribution in growth responses to climate.