Campus Units

Botany

Document Type

Article

Publication Version

Published Version

Publication Date

1995

Journal or Book Title

Global Biochemical Cycles

Volume

9

Issue

1

First Page

23

Last Page

36

DOI

10.1029/94GB02723

Abstract

We use semi-mechanistic, empirically based statistical models to predict the spatial and temporal patterns of global carbon dioxide emissions from terrestrial soils. Emissions include the respiration of both soil organisms and plant roots. At the global scale, rates of soil CO2 efflux correlate significantly with temperature and precipitation; they do not correlate well with soil carbon pools, soil nitrogen pools, or soil C:N. Wetlands cover about 3% of the land area but diminish predicted CO2 emissions by only about 1%. The estimated annual flux of CO2 from soils to the atmosphere is estimated to be 76.5 Pg C yr−1, 1–9 Pg greater than previous global estimates, and 30–60% greater than terrestrial net primary productivity. Historic land cover changes are estimated to have reduced current annual soil CO2 emissions by 0.2–2.0 Pg C yr−1 in comparison with an undisturbed vegetation cover. Soil CO2 fluxes have a pronounced seasonal pattern in most locations, with maximum emissions coinciding with periods of active plant growth. Our models suggest that soils produce CO2 throughout the year and thereby contribute to the observed wintertime increases in atmospheric CO2 concentrations. Our derivation of statistically based estimates of soil CO2 emissions at a 0.5° latitude by longitude spatial and monthly temporal resolution represents the best-resolved estimate to date of global CO2 fluxes from soils and should facilitate investigations of net carbon exchanges between the atmosphere and terrestrial biosphere.

Comments

This article is published as Copyright by the Ecological Society of America Raich, James W., and Christopher S. Potter. "Global patterns of carbon dioxide emissions from soils." Global Biogeochemical Cycles 9, no. 1 (1995): 23-36. 10.1029/94GB02723. Posted with permission.

Copyright Owner

American Geophysical Union

Language

en

File Format

application/pdf

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