Tree rings provide an invaluable long-term record for understanding how climate and other drivers shape tree growth and forest productivity. However, conventional tree-ring analysis methods were not designed to simultaneously test effects of climate, tree size, and other drivers on individual growth. This has limited the potential to test ecologically relevant hypotheses on tree growth sensitivity to environmental drivers and their interactions with tree size. Here, we develop and apply a new method to simultaneously model nonlinear effects of primary climate drivers, reconstructed tree diameter at breast height (DBH), and calendar year in generalized least squares models that account for the temporal autocorrelation inherent to each individual tree's growth. We analyze data from 3811 trees representing 40 species at 10 globally distributed sites, showing that precipitation, temperature, DBH, and calendar year have additively, and often interactively, influenced annual growth over the past 120 years. Growth responses were predominantly positive to precipitation (usually over ≥3-month seasonal windows) and negative to temperature (usually maximum temperature, over ≤3-month seasonal windows), with concave-down responses in 63% of relationships. Climate sensitivity commonly varied with DBH (45% of cases tested), with larger trees usually more sensitive. Trends in ring width at small DBH were linked to the light environment under which trees established, but basal area or biomass increments consistently reached maxima at intermediate DBH. Accounting for climate and DBH, growth rate declined over time for 92% of species in secondary or disturbed stands, whereas growth trends were mixed in older forests. These trends were largely attributable to stand dynamics as cohorts and stands age, which remain challenging to disentangle from global change drivers. By providing a parsimonious approach for characterizing multiple interacting drivers of tree growth, our method reveals a more complete picture of the factors influencing growth than has previously been possible.

Canadian Forest Service Northern Forestry Centre Edmonton Alberta Canada

Center for Plant Science Innovation University of Nebraska Lincoln USA

Center for Tree Science The Morton Arboretum Lisle Illinois USA

CIRAD Montpellier France

Conservation Ecology Center Smithsonian Conservation Biology Institute Front Royal Virginia USA

Department of Biology Wilfrid Laurier University Waterloo ON Canada

Department of Forest Ecology The Silva Tarouca Research Institute for Landscape and Ornamental Gardening Brno Czech Republic

Department of Forestry and Natural Resources Purdue University West Lafayette Indiana USA

Department of Geography and Environmental Studies University of New Mexico Albuquerque New Mexico USA

Department of Geography Indiana University Bloomington Indiana USA

Faculty of Forestry University of British Columbia Vancouver British Columbia Canada

Forest Ecology and Forest Management Group Wageningen The Netherlands

Forest Global Earth Observatory Smithsonian Tropical Research Institute Panama Republic of Panama

Fort Collins Science Center U S Geological Survey New Mexico Landscapes Field Station Los Alamos New Mexico USA

Harvard University Petersham Massachusetts USA

Midwest Dendro LLC Naperville Illinois USA

National Parks Wildlife and Plant Conservation Department Bangkok Thailand

S J and Jessie E Quinney College of Natural Resources and the Ecology Center Utah State University Logan Utah USA

School of Biological Sciences University of Nebraska Lincoln USA

School of Ecosystem and Forest Sciences University of Melbourne Richmond VIC Australia

School of Natural Resources University of Nebraska Lincoln Lincoln Nebraska USA

Smithsonian Environmental Research Center Edgewater Maryland USA

Swiss Federal Institute for Forest Snow and Landscape Research Birmensdorf Switzerland

University of Alberta Edmonton Alberta Canada

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