Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Amazon Forest Responses to CO2 Fertilization Dependent on Plant Phosphorus Acquisition

TitleAmazon Forest Responses to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
Publication TypeJournal Article
Year of Publication2019
AuthorsFleischer, Katrin, Rammig Anja, De Kauwe Martin G., Walker Anthony P., Domingues Tomas F., Fuchslueger Lucia, Garcia Sabrina, Goll Daniel S., Grandis Adriana, Jiang Mingkai, Haverd Vanessa, Hofhansl Florian, Holm Jennifer A., Kruijt Bart, Leung Felix, Medlyn Belinda E., Mercado Lina M., Norby Richard J., Pak Bernard, Quesada Carlos A., von Randow Celso, Schaap Karst J., Valverde-Barrantes Oscar J., Wang Ying-Ping, Yang Xiaojuan, Zaehle Sönke, Zhu Qing, and Lapola David M.
JournalNature Geoscience
Volume12
Pages736–741
Abstract / Summary

Global terrestrial models currently predict that the Amazon rainforest will continue to act as a carbon sink in the future, primarily owing to the rising atmospheric carbon dioxide (CO2) concentration. Soil phosphorus impoverishment in parts of the Amazon basin largely controls its functioning, but the role of phosphorus availability has not been considered in global model ensembles—for example, during the Fifth Climate Model Intercomparison Project. Here we simulate the planned free-air CO2 enrichment experiment AmazonFACE with an ensemble of 14 terrestrial ecosystem models. We show that phosphorus availability reduces the projected CO2-induced biomass carbon growth by about 50% to 79 ± 63 g C m−2 yr−1 over 15 years compared to estimates from carbon and carbon–nitrogen models. Our results suggest that the resilience of the region to climate change may be much less than previously assumed. Variation in the biomass carbon response among the phosphorus-enabled models is considerable, ranging from 5 to 140 g C m−2 yr−1, owing to the contrasting plant phosphorus use and acquisition strategies considered among the models. The Amazon forest response thus depends on the interactions and relative contributions of the phosphorus acquisition and use strategies across individuals, and to what extent these processes can be upregulated under elevated CO2.

URLhttps://www.nature.com/articles/s41561-019-0404-9
DOI10.1038/s41561-019-0404-9 ID
Journal: Nature Geoscience
Year of Publication: 2019
Volume: 12
Pages: 736–741
Publication Date: 08/2019

Global terrestrial models currently predict that the Amazon rainforest will continue to act as a carbon sink in the future, primarily owing to the rising atmospheric carbon dioxide (CO2) concentration. Soil phosphorus impoverishment in parts of the Amazon basin largely controls its functioning, but the role of phosphorus availability has not been considered in global model ensembles—for example, during the Fifth Climate Model Intercomparison Project. Here we simulate the planned free-air CO2 enrichment experiment AmazonFACE with an ensemble of 14 terrestrial ecosystem models. We show that phosphorus availability reduces the projected CO2-induced biomass carbon growth by about 50% to 79 ± 63 g C m−2 yr−1 over 15 years compared to estimates from carbon and carbon–nitrogen models. Our results suggest that the resilience of the region to climate change may be much less than previously assumed. Variation in the biomass carbon response among the phosphorus-enabled models is considerable, ranging from 5 to 140 g C m−2 yr−1, owing to the contrasting plant phosphorus use and acquisition strategies considered among the models. The Amazon forest response thus depends on the interactions and relative contributions of the phosphorus acquisition and use strategies across individuals, and to what extent these processes can be upregulated under elevated CO2.

DOI: 10.1038/s41561-019-0404-9 ID
Citation:
Fleischer, K, A Rammig, MG De Kauwe, AP Walker, TF Domingues, L Fuchslueger, S Garcia, et al.  2019.  "Amazon Forest Responses to CO2 Fertilization Dependent on Plant Phosphorus Acquisition."  Nature Geoscience 12: 736–741.  https://doi.org/10.1038/s41561-019-0404-9 ID.