@article{Dong:2022:10.1111/nph.18076,
author = {Dong, N and Wright, IJ and Chen, JM and Luo, X and Wang, H and Keenan, T and Smith, NG and Prentice, IC},
doi = {10.1111/nph.18076},
journal = {New Phytologist},
pages = {1692--1700},
title = {Rising CO2 and warming reduce global canopy deman for nitrogen},
url = {http://dx.doi.org/10.1111/nph.18076},
volume = {235},
year = {2022}
}

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TY  - JOUR
AB  - Nitrogen (N) limitation has been considered as a constraint on terrestrial carbon uptake in response to rising CO2 and climate change. By extension, it has been suggested that declining carboxylation capacity (Vcmax) and leaf N content in enhanced-CO2 experiments and satellite records signify increasing N limitation of primary production. We predicted Vcmax using the coordination hypothesis, and estimated changes in leaf-level photosynthetic N for 1982–2016 assuming proportionality with leaf-level Vcmax at 25C. Whole-canopy photosynthetic N was derived using satellite-based leaf area index (LAI) data and an empirical extinction coefficient for Vcmax, and converted to annual N demand using estimated leaf turnover times. The predicted spatial pattern of Vcmax shares key features with an independent reconstruction from remotely-sensed leaf chlorophyll content. Predicted leaf photosynthetic N declined by 0.27 % yr-1, while observed leaf (total) N declined by 0.2–0.25 % yr-1. Predicted global canopy N (and N demand) declined from 1996 onwards, despite increasing LAI. Leaf-level responses to rising CO2, and to a lesser extent temperature, may have reduced the canopy requirement for N by more than rising LAI has increased it. This finding provides an alternative explanation for declining leaf N that does not depend on increasing N limitation.
AU  - Dong,N
AU  - Wright,IJ
AU  - Chen,JM
AU  - Luo,X
AU  - Wang,H
AU  - Keenan,T
AU  - Smith,NG
AU  - Prentice,IC
DO  - 10.1111/nph.18076
EP  - 1700
PY  - 2022///
SN  - 0028-646X
SP  - 1692
TI  - Rising CO2 and warming reduce global canopy deman for nitrogen
T2  - New Phytologist
UR  - http://dx.doi.org/10.1111/nph.18076
UR  - https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.18076
UR  - http://hdl.handle.net/10044/1/95849
VL  - 235
ER  - 

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