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

来源：Nature Communications

发表年代：2019年

作者：Anthony P. Walker*, Martin G. De Kauwe, Belinda E. Medlyn, Sönke Zaehle, Colleen M. Iversen, Shinichi Asao, Bertrand Guenet, Anna Harper, Thomas Hickler, Bruce A. Hungate, Atul K. Jain, Yiqi Luo, Xingjie Lu, Meng Lu, Kristina Luus, J. Patrick Megonigal, Ram Oren, Edmund Ryan, Shijie Shu, Alan Talhelm, Yingping Wang, Jeffrey M. Warren, Christian Werner, Jianyang Xia, Bai Yang, Donald R. Zak & Richard J. Norby

Abstract 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.

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