Empirical estimates of regional carbon budgets imply reduced global soil heterotrophic respiration

Resolving regional carbon budgets is critical for informing land-based mitigation policy. For nine regions covering nearly the whole globe, we collected inventory estimates of carbon-stock changes complemented by satellite estimates of biomass changes where inventory data aremissing. The net land-atmospheric carbon exchange (NEE) was calculated by taking the sum of the carbon-stock change and lateral carbon fluxes from crop and wood trade, and riverine-carbon export to the ocean. Summing up NEE from all regions, we obtained a global 'bottom-up' NEE for net land anthropogenic CO2 uptake of -2.2 +/- 0.6 PgC yr(-1) consistent with the independent top-down NEE from the global atmospheric carbon budget during 2000-2009. This estimate is so far the most comprehensive global bottom-up carbon budget accounting, which set up an important milestone for global carbon-cycle studies. By decomposing NEE into component fluxes, we found that global soil heterotrophic respiration amounts to a source of CO2 of 39 PgC yr(-1) with an interquartile of 33-46 PgC yr(-1) -a much smaller portion of net primary productivity than previously reported.

Авторы
Ciais P.1, 2 , Yao Y.T.1 , Gasser T.3 , Baccini A.4 , Wang Y.L.5 , Lauerwald R.1, 6 , Peng S.S.2 , Bastos A.7 , Li W. 8 , Raymond P.A.9 , Canadell J.G.10 , Peters G.P.11 , Andres R.J.12, 13 , Chang J.F.1 , Yue C.1, 14 , Dolman A.J.15 , Haverd V.16 , Hartmann J.17 , Laruelle G.6 , Konings A.G.18 , King A.W.12, 13 , Liu Y.19 , Luyssaert S.20 , Maignan F.1 , Patra P.K.21, 22 , Peregon A.1, 23, 24 , Regnier P.6 , Pongratz J.6, 25 , Poulter B.26 , Shvidenko A.3 , Valentini R. 27, 28 , Wang R. 29 , Broquet G.1 , Yin Y.30 , Zscheischler J.31, 32 , Guenet B.1 , Goll D.S.1 , Ballantyne A.P.33 , Yang H.1 , Qiu C.J.1 , Zhu D.1
Журнал
NATIONAL SCIENCE REVIEW
Издательство
OXFORD UNIV PRESS
Номер выпуска
2
Язык
Английский
Статус
Опубликовано
DOI
10.1093/NSR/NWAA145
Номер
nwaa145
Том
8
Год
2021
Организации
  • 1 CEA CNRS UVSQ UPSACLAY, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France
  • 2 Peking Univ, Coll Urban & Environm Sci, Sino French Inst Earth Syst Sci, Beijing 100871, Peoples R China
  • 3 Int Inst Appl Syst Anal IIASA, A-2361 Laxenburg, Austria
  • 4 Woods Hole Res Ctr, Falmouth, MA 02540 USA
  • 5 Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100871, Peoples R China
  • 6 Univ Libre Bruxelles, Dept Geosci Environm & Soc, B-1050 Brussels, Belgium
  • 7 Ludwig Maximilians Univ Munchen, Dept Geog, D-80333 Munich, Germany
  • 8 Tsinghua Univ, Dept Earth Syst Sci, Beijing 100084, Peoples R China
  • 9 Yale Univ, Yale Sch Forestry & Environm Studies, New Haven, CT 06511 USA
  • 10 CSIRO Oceans & Atmosphere, Global Carbon Project, Canberra, ACT 2601, Australia
  • 11 CICERO Ctr Int Climate Res, N-0349 Oslo, Norway
  • 12 Oak Ridge Natl Lab, Environm Sci Div, Oak Ridge, TN 37831 USA
  • 13 Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN 37831 USA
  • 14 Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
  • 15 Vrije Univ Amsterdam, Dept Earth Sci, NL-1081 HV Amsterdam, Netherlands
  • 16 CSIRO Oceans & Atmosphere, Canberra, ACT 2601, Australia
  • 17 Univ Hamburg, CEN Ctr Earth Syst Res & Sustainabil, Inst Geol, D-20146 Hamburg, Germany
  • 18 Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA
  • 19 Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Peoples R China
  • 20 Vrije Univ Amsterdam, Dept Ecol Sci, NL-1081 HV Amsterdam, Netherlands
  • 21 JAMSTEC, Res Inst Global Change, Yokosuka, Kanagawa 2360001, Japan
  • 22 Chiba Univ, Ctr Environm Remote Sensing, Chiba 2638522, Japan
  • 23 Russian Acad Sci SB RAS, Inst Soil Sci & Agrochem, Siberian Branch, Novosibirsk 630090, Russia
  • 24 Tuva State Univ, Republic Of Tuva 667000, Russia
  • 25 Max Planck Inst Meteorol, D-20146 Hamburg, Germany
  • 26 NASA, Goddard Space Flight Ctr, Biospher Sci Lab, Greenbelt, MD 20771 USA
  • 27 Univ Tuscia, Dept Innovat Biol Agrofood & Forest Syst DIBAF, I-01100 Viterbo, Italy
  • 28 RUDN Univ, Moscow 117198, Russia
  • 29 Fudan Univ, Inst Atmospher Sci, Dept Environm Sci & Engn, Shanghai Key Lab Atmospher Particle Pollut & Prev, Shanghai 200433, Peoples R China
  • 30 CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
  • 31 Univ Bern, Climate & Environm Phys, CH-3012 Bern, Switzerland
  • 32 Univ Bern, Oeschger Ctr Climate Change Res, CH-3012 Bern, Switzerland
  • 33 Univ Montana, Dept Ecosyst & Conservat Sci, Missoula, MT 59801 USA
Ключевые слова
carbon budget; human appropriation of ecosystems; soil carbon
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