Beyond bulk: Density fractions explain heterogeneity in global soil carbon abundance and persistence.

Autor: Heckman K; USDA Forest Service, Northern Research Station, Houghton, Michigan, USA., Hicks Pries CE; Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire, USA., Lawrence CR; U.S. Geological Survey, Geosciences and Environmental Change Science Center, Denver, Colorado, USA., Rasmussen C; Department of Environmental Science, University of Arizona, Tucson, Arizona, USA., Crow SE; Natural Resources and Environmental Management Department, University of Hawaii Manoa, Honolulu, Hawaii, USA., Hoyt AM; Department of Biogeochemical Processes, Max-Planck-Institute for Biogeochemistry, Jena, Germany.; Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA., von Fromm SF; Department of Biogeochemical Processes, Max-Planck-Institute for Biogeochemistry, Jena, Germany.; Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland., Shi Z; Computational Sciences & Engineering Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA., Stoner S; Department of Biogeochemical Processes, Max-Planck-Institute for Biogeochemistry, Jena, Germany.; Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland., McGrath C; Natural Resources and Environmental Management Department, University of Hawaii Manoa, Honolulu, Hawaii, USA., Beem-Miller J; Department of Biogeochemical Processes, Max-Planck-Institute for Biogeochemistry, Jena, Germany., Berhe AA; Department of Life and Environmental Sciences, University of California, Merced, California, USA., Blankinship JC; Department of Environmental Science, University of Arizona, Tucson, Arizona, USA., Keiluweit M; School of Earth & Sustainability and Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts, USA., Marín-Spiotta E; Department of Geography, University of Wisconsin-Madison, Madison, Wisconsin, USA., Monroe JG; Department of Plant Sciences, University of California, Davis, Davis, California, USA., Plante AF; Department of Earth & Environmental Science, University of Pennsylvania, Philadelphia, PA, USA., Schimel J; Department of Ecology Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, California, USA., Sierra CA; Department of Biogeochemical Processes, Max-Planck-Institute for Biogeochemistry, Jena, Germany.; Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden., Thompson A; Department of Crop and Soil Sciences and the Odum School of Ecology, University of Georgia, Athens, Georgia, USA., Wagai R; Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2022 Feb; Vol. 28 (3), pp. 1178-1196. Date of Electronic Publication: 2021 Dec 16.
DOI: 10.1111/gcb.16023
Abstrakt: Understanding the controls on the amount and persistence of soil organic carbon (C) is essential for predicting its sensitivity to global change. The response may depend on whether C is unprotected, isolated within aggregates, or protected from decomposition by mineral associations. Here, we present a global synthesis of the relative influence of environmental factors on soil organic C partitioning among pools, abundance in each pool (mg C g -1  soil), and persistence (as approximated by radiocarbon abundance) in relatively unprotected particulate and protected mineral-bound pools. We show that C within particulate and mineral-associated pools consistently differed from one another in degree of persistence and relationship to environmental factors. Soil depth was the best predictor of C abundance and persistence, though it accounted for more variance in persistence. Persistence of all C pools decreased with increasing mean annual temperature (MAT) throughout the soil profile, whereas persistence increased with increasing wetness index (MAP/PET) in subsurface soils (30-176 cm). The relationship of C abundance (mg C g -1  soil) to climate varied among pools and with depth. Mineral-associated C in surface soils (<30 cm) increased more strongly with increasing wetness index than the free particulate C, but both pools showed attenuated responses to the wetness index at depth. Overall, these relationships suggest a strong influence of climate on soil C properties, and a potential loss of soil C from protected pools in areas with decreasing wetness. Relative persistence and abundance of C pools varied significantly among land cover types and soil parent material lithologies. This variability in each pool's relationship to environmental factors suggests that not all soil organic C is equally vulnerable to global change. Therefore, projections of future soil organic C based on patterns and responses of bulk soil organic C may be misleading.
(© 2021 John Wiley & Sons Ltd. This article has been contributed to by US Government employees and their work is in the public domain in the USA.)
Databáze: MEDLINE
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