Microbial competition for phosphorus limits the CO2 response of a mature forest

• 成果类型: Article
• 署名作者: Jiang, Mingkai; Crous, Kristine Y.; Carrillo, Yolima; Macdonald, Catriona A.; Anderson, Ian C.; Boer, Matthias M.; Farrell, Mark; Gherlenda, Andrew N.; Castaneda-Gomez, Laura; Hasegawa, Shun; Jarosch, Klaus; Milham, Paul J.; Ochoa-Hueso, Raul; Pathare, Varsha; Pihlblad, Johanna; Pineiro, Juan; Powell, Jeff R.; Power, Sally A.; Reich, Peter B.; Riegler, Markus; Zaehle, Soenke; Smith, Benjamin; Medlyn, Belinda E.; Ellsworth, David S.
• 署名单位: Zhejiang University; Western Sydney University; Commonwealth Scientific & Industrial Research Organisation (CSIRO); CSIRO Agriculture & Food; Norwegian Institute of Bioeconomy Research; University of Bern; Swiss Federal Research Station Agroscope; Universidad de Cadiz; Royal Netherlands Academy of Arts & Sciences; Netherlands Institute of Ecology (NIOO-KNAW); University of Illinois System; University of Illinois Urbana-Champaign; University of Birmingham; University of Birmingham; Universidad Politecnica de Madrid; University of Minnesota System; University of Minnesota Twin Cities; University of Michigan System; University of Michigan; University of Michigan System; University of Michigan; Max Planck Society
• 刊物名称: Nature
• ISSN/ISSBN: 0028-5466
• DOI: 10.1038/s41586-024-07491-0
• 发表日期: 2024-06-20
• 页码: 660-+
• 关键词: elevated atmospheric co2; nutrient availability; confidence-intervals; eucalyptus woodland; practical guide; carbon; nitrogen; biomass; fertilization; enrichment

摘要

The capacity for terrestrial ecosystems to sequester additional carbon (C) with rising CO2 concentrations depends on soil nutrient availability(1,2). Previous evidence suggested that mature forests growing on phosphorus (P)-deprived soils had limited capacity to sequester extra biomass under elevated CO2 (refs. 3-6), but uncertainty about ecosystem P cycling and its CO2 response represents a crucial bottleneck for mechanistic prediction of the land C sink under climate change(7). Here, by compiling the first comprehensive P budget for a P-limited mature forest exposed to elevated CO2, we show a high likelihood that P captured by soil microorganisms constrains ecosystem P recycling and availability for plant uptake. Trees used P efficiently, but microbial pre-emption of mineralized soil P seemed to limit the capacity of trees for increased P uptake and assimilation under elevated CO2 and, therefore, their capacity to sequester extra C. Plant strategies to stimulate microbial P cycling and plant P uptake, such as increasing rhizosphere C release to soil, will probably be necessary for P-limited forests to increase C capture into new biomass. Our results identify the key mechanisms by which P availability limits CO2 fertilization of tree growth and will guide the development of Earth system models to predict future long-term C storage.