Decadal biomass increment in early secondary succession woody ecosystems is increased by CO<sub>2</sub> enrichment.
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2019-02
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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.
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Walker, Anthony P, Martin G De Kauwe, Belinda E Medlyn, Sönke Zaehle, Colleen M Iversen, Shinichi Asao, Bertrand Guenet, Anna Harper, et al. (2019). Decadal biomass increment in early secondary succession woody ecosystems is increased by CO2 enrichment. Nature communications, 10(1). p. 454. 10.1038/s41467-019-08348-1 Retrieved from https://hdl.handle.net/10161/27526.
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