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- Title
Convergence in phosphorus constraints to photosynthesis in forests around the world.
- Authors
Ellsworth, David S.; Crous, Kristine Y.; De Kauwe, Martin G.; Verryckt, Lore T.; Goll, Daniel; Zaehle, Sönke; Bloomfield, Keith J.; Ciais, Philippe; Cernusak, Lucas A.; Domingues, Tomas F.; Dusenge, Mirindi Eric; Garcia, Sabrina; Guerrieri, Rossella; Ishida, F. Yoko; Janssens, Ivan A.; Kenzo, Tanaka; Ichie, Tomoaki; Medlyn, Belinda E.; Meir, Patrick; Norby, Richard J.
- Abstract
Tropical forests take up more carbon (C) from the atmosphere per annum by photosynthesis than any other type of vegetation. Phosphorus (P) limitations to C uptake are paramount for tropical and subtropical forests around the globe. Yet the generality of photosynthesis-P relationships underlying these limitations are in question, and hence are not represented well in terrestrial biosphere models. Here we demonstrate the dependence of photosynthesis and underlying processes on both leaf N and P concentrations. The regulation of photosynthetic capacity by P was similar across four continents. Implementing P constraints in the ORCHIDEE-CNP model, gross photosynthesis was reduced by 36% across the tropics and subtropics relative to traditional N constraints and unlimiting leaf P. Our results provide a quantitative relationship for the P dependence for photosynthesis for the front-end of global terrestrial C models that is consistent with canopy leaf measurements. Phosphorus (P) limitation is pervasive in tropical forests. Here the authors analyse the dependence of photosynthesis on leaf N and P in tropical forests, and show that incorporating leaf P constraints in a terrestrial biosphere model enhances its predictive power.
- Subjects
PHOTOSYNTHESIS; TROPICAL forests; BIOSPHERE
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-32545-0