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

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Walker, AP; De Kauwe, MG; Medlyn, BE; Zaehle, S; Iversen, CM; Asao, S; Guenet, B; Harper, A; Hickler, T; Hungate, BA; Jain, AK; Luo, Y; Lu, X; Lu, M; Luus, K; Megonigal, JP; Oren, R; Ryan, E; Shu, S; Talhelm, A; Wang, Y-P; Warren, JM; Werner, C; Xia, J; Yang, B; Zak, DR; Norby, RJ

Published Date

  • February 14, 2019

Published In

Volume / Issue

  • 10 / 1

Start / End Page

  • 454 -

PubMed ID

  • 30765702

Pubmed Central ID

  • 30765702

Electronic International Standard Serial Number (EISSN)

  • 2041-1723

International Standard Serial Number (ISSN)

  • 2041-1723

Digital Object Identifier (DOI)

  • 10.1038/s41467-019-08348-1

Language

  • eng