TY - JOUR
T1 - Global patterns and climatic controls of belowground net carbon fixation
AU - Gherardi, Laureano A.
AU - Sala, Osvaldo E.
N1 - Funding Information:
We acknowledge the work of all researchers that collected these data over the years. We appreciate the crucial contributions of organizations that gather, clean, and make data available, such as Oak Ridge National Lab, Ecotrends and the Long-Term Ecological Research Network. The comments and contributions of three anonymous reviewers and the journal editor improved this manuscript significantly. We thank Diana Wall, André C. Franco, and R.C. de Avellaneda for earlier discussion of ideas and input. This research was supported by Arizona State University, the Global Drylands Center, and the NSF (Grants DEB 14-56597, 17-54106, and 18-32194).
Funding Information:
ACKNOWLEDGMENTS. We acknowledge the work of all researchers that collected these data over the years. We appreciate the crucial contributions of organizations that gather, clean, and make data available, such as Oak Ridge National Lab, Ecotrends and the Long-Term Ecological Research Network. The comments and contributions of three anonymous reviewers and the journal editor improved this manuscript significantly. We thank Diana Wall, André C. Franco, and R.C. de Avellaneda for earlier discussion of ideas and input. This research was supported by Arizona State University, the Global Drylands Center, and the NSF (Grants DEB 14-56597, 17-54106, and 18-32194).
Publisher Copyright:
© 2020 National Academy of Sciences. All rights reserved.
PY - 2020/8
Y1 - 2020/8
N2 - The fraction of fixed carbon allocated belowground in terrestrial ecosystems is the most uncertain component of global carbon cycle assessments. Here we present a novel approach to determining global quantification of belowground productivity, which is estimated at 24.7 Pg y−1 and accounts for 46% of terrestrial carbon fixation. Carbon allocated belowground has a longer residence than its aboveground counterpart, playing a key role in long-term carbon storage. Total belowground productivity increases with precipitation, but the rate of increase decreases from arid to humid ecosystems. The fraction of total fixed carbon entering the soil decreases with precipitation and varies significantly among biomes. These results are indicative of the possible impacts of climate and land use changes on the global carbon cycle.
AB - The fraction of fixed carbon allocated belowground in terrestrial ecosystems is the most uncertain component of global carbon cycle assessments. Here we present a novel approach to determining global quantification of belowground productivity, which is estimated at 24.7 Pg y−1 and accounts for 46% of terrestrial carbon fixation. Carbon allocated belowground has a longer residence than its aboveground counterpart, playing a key role in long-term carbon storage. Total belowground productivity increases with precipitation, but the rate of increase decreases from arid to humid ecosystems. The fraction of total fixed carbon entering the soil decreases with precipitation and varies significantly among biomes. These results are indicative of the possible impacts of climate and land use changes on the global carbon cycle.
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U2 - 10.1073/PNAS.2006715117
DO - 10.1073/PNAS.2006715117
M3 - Article
C2 - 32747527
AN - SCOPUS:85089787893
SN - 0027-8424
VL - 117
SP - 20038
EP - 20043
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 33
ER -