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

Details

Serval ID
serval:BIB_CF7AFE2867D7
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Beyond bulk: Density fractions explain heterogeneity in global soil carbon abundance and persistence.
Journal
Global change biology
Author(s)
Heckman K., Hicks Pries C.E., Lawrence C.R., Rasmussen C., Crow S.E., Hoyt A.M., von Fromm S.F., Shi Z., Stoner S., McGrath C., Beem-Miller J., Berhe A.A., Blankinship J.C., Keiluweit M., Marín-Spiotta E., Monroe J.G., Plante A.F., Schimel J., Sierra C.A., Thompson A., Wagai R.
ISSN
1365-2486 (Electronic)
ISSN-L
1354-1013
Publication state
Published
Issued date
02/2022
Peer-reviewed
Oui
Volume
28
Number
3
Pages
1178-1196
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
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 <sup>-1</sup> 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 <sup>-1</sup> 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.
Keywords
Carbon, Climate, Minerals, Soil, Temperature, climate change, persistence, radiocarbon, soil carbon, soil fractions, soil organic matter, terrestrial carbon cycle
Pubmed
Web of science
Create date
22/07/2024 11:08
Last modification date
23/07/2024 6:56
Usage data