An eco-physiological model of forest photosynthesis and transpiration under combined nitrogen and water limitation

20330 10 108812 2 329689 document 108812 tpae168.pdf application/pdf c0a1fbc7a1b1ee77b1dff1b9c980d81b MD5 1712846 2025-02-04 14:22:33 https://pure.iiasa.ac.at/id/eprint/20330/7/tpae168.pdf 20330 7 7 application/pdf text en public cc_by_4

tpae168.pdf

published 108813 1 329694 document 108813 indexcodes.txt text/x-c 1a6b3c0f7496819d720fc14817c45c0a MD5 14441 2025-02-04 14:33:00 https://pure.iiasa.ac.at/id/eprint/20330/8/indexcodes.txt 20330 8 8 text/x-c other Generate index codes conversion from text to indexcodes en public

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/108812 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/108812 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/108812 archive 353 disk0/00/02/03/30 2025-01-13 09:40:25 2025-02-04 14:23:11 2025-01-13 09:40:25 article show Fransson P. Lim H. 9827 Zhao P. Tor-Ngern P. Peichl M. Laudon H. Henriksson N. Näsholm T. Franklin O. 1791 0000-0002-0376-4140 An eco-physiological model of forest photosynthesis and transpiration under combined nitrogen and water limitation pub BNR AFE Nitrogen uptake; Optimality theory; Plant hydraulics; Scots pine; Stomatal model Although the separate effects of water and nitrogen (N) limitations on forest growth are well known, the question of how to predict their combined effects remains a challenge for modeling of climate change impacts on forests. Here, we address this challenge by developing a new eco-physiological model that accounts for plasticity in stomatal conductance and leaf N concentration. Based on optimality principle, our model determines stomatal conductance and leaf N concentration by balancing carbon uptake maximization, hydraulic risk and cost of maintaining photosynthetic capacity. We demonstrate the accuracy of the model predictions by comparing them against gross primary production estimates from eddy covariance flux measurements and sap-flow measurement scaled canopy transpiration in a long-term fertilized and an unfertilized Scots pine (Pinus sylvestris L.) forest in northern Sweden. The model also explains the response to N fertilization as a consequence of (i) reduced carbon cost of N uptake and (ii) increased leaf area per hydraulic conductance. The results suggest that leaves optimally coordinate N concentration and stomatal conductance both on short (weekly) time scales in response to weather conditions and on longer time scales in response to soil water and N availabilities. 2025-02 published Oxford University Press (OUP) doi:10.1093/treephys/tpae168 3709 95 public Tree Physiology 45 2 tpae168 TRUE 1758-4469 info:eu-repo/semantics/article