Decadal biomass increment in early secondary succession woody ecosystems is increased by CO2 enrichment

Anthony Walker, Martin De Kauwe, Belinda Medlyn, Colleen Iversen, Sonke Zaehle, Shinichi Asao, Bertrand Guenet, Anna Harper, Thomas Hickler, Bruce Hungate, Atul Jain, Yiqi Luo, Xingjie Lu, Meng Lu, Kristina Luus, Patrick Megonigal, Ram Oren, Edmund Ryan, Shinjie Shu, Alan TalhelmYing Wang, Jeffrey Warren, Christian Werner, Jianyang Xia, Bai Wang, Donald Zak, Richard Norby

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Increasing atmospheric CO2 stimulates photosynthesis which can increase net primary production (NPP), but at longer timescales may not necessarily increase plant biomass. Here we analyse the four decade-long CO2-enrichment experiments in woody ecosystems that measured total NPP and biomass. CO2 enrichment increased biomass increment by 1.05 ± 0.26 kg C m−2 over a full decade, a 29.1 ± 11.7% stimulation of biomass gain in these early-secondary-succession temperate ecosystems. This response is predictable by combining the CO2 response of NPP (0.16 ± 0.03 kg C m−2 y−1) and the CO2-independent, linear slope between biomass increment and cumulative NPP (0.55 ± 0.17). An ensemble of terrestrial ecosystem models fail to predict both terms correctly. Allocation to wood was a driver of across-site, and across-model, response variability and together with CO2-independence of biomass retention highlights the value of understanding drivers of wood allocation under ambient conditions to correctly interpret and predict CO2 responses.
Original languageUndefined
JournalNature Communications
Early online date14 Feb 2019
Publication statusE-pub ahead of print - 14 Feb 2019

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