Amazon forest response to CO2 fertilization dependent on plant phosphorus acquisition

Fleischer K, Rammig A, De Kauwe MG, Walker AP, Domingues TF, Fuchslueger L, Garcia S, Goll DS, et al. (2019). Amazon forest response to CO2 fertilization dependent on plant phosphorus acquisition. Nature Geoscience DOI:10.1038/s41561-019-0404-9. (In Press)

[img] Text
26789_2_merged_1559831696.pdf - Accepted Version
Restricted to Repository staff only until 8 February 2020.
Available under License Creative Commons Attribution Non-commercial.

Download (596kB)
Project: Effects of phosphorus limitations on Life, Earth system and Society (IMBALANCE-P, FP7 610028), Land use change: assessing the net climate forcing, and options for climate change mitigation and adaptation (LUC4C, H2020 603542)

Abstract

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.

Item Type: Article
Research Programs: Evolution and Ecology (EEP)
Ecosystems Services and Management (ESM)
Depositing User: Luke Kirwan
Date Deposited: 06 Aug 2019 05:51
Last Modified: 06 Aug 2019 09:00
URI: http://pure.iiasa.ac.at/16021

Actions (login required)

View Item View Item

International Institute for Applied Systems Analysis (IIASA)
Schlossplatz 1, A-2361 Laxenburg, Austria
Phone: (+43 2236) 807 0 Fax:(+43 2236) 71 313