In this section
@article{Chen:2022:10.1073/pnas.2115627119,
author = {Chen, C and Riley, W and Prentice, IC and Keenan, T},
doi = {10.1073/pnas.2115627119},
journal = {Proceedings of the National Academy of Sciences of USA},
title = {CO2 fertilization of terrestrial photosynthesis inferred from site to global scales},
url = {http://dx.doi.org/10.1073/pnas.2115627119},
volume = {119},
year = {2022}
}
TY - JOUR
AB - Global photosynthesis is increasing with elevated atmospheric CO2 concentrations, a response known as the CO2 fertilization effect (CFE), but the key processes of CFE are not constrained and therefore remain uncertain. Here we quantify CFE by combining observations from a globally distributed network of eddy covariance measurements with a novel analyticalframework based on three well-established photosynthetic optimization theories. We report a strong enhancement of photosynthesis across the observational network (9.1 gC m–2 yr–2) and show that the CFE is responsible for 44% of the gross primary production (GPP) enhancementsince the 2000s, with additional contributions primarily from warming (28%). Soil moisture and specific humidity are the two largest contributors to GPP interannual variation through their influences on plant hydraulics. Applying our framework to satellite observations and meteorological reanalysis data, we diagnose a global CO2-induced GPP trend of 4.4 gC m–2 yr–2, which is at least one-third stronger than the median trends of 13 Dynamic Global Vegetation Models and 8 satellite-derived GPP products, mainly due to their differences in the magnitude of CFE in evergreen broadleaf forests. These results highlight the critical role that CFE has had on the global carbon cycle in recent decades.
AU - Chen,C
AU - Riley,W
AU - Prentice,IC
AU - Keenan,T
DO - 10.1073/pnas.2115627119
PY - 2022///
SN - 0027-8424
TI - CO2 fertilization of terrestrial photosynthesis inferred from site to global scales
T2 - Proceedings of the National Academy of Sciences of USA
UR - http://dx.doi.org/10.1073/pnas.2115627119
UR - https://www.pnas.org/doi/full/10.1073/pnas.2115627119
UR - http://hdl.handle.net/10044/1/94462
VL - 119
ER -