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| Titel |
Soil organic matter dynamics in a North America tallgrass prairie after 9 yr of experimental warming |
| VerfasserIn |
X. Cheng, Y. Luo, X. Xu, R. Sherry, Q. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 6 ; Nr. 8, no. 6 (2011-06-09), S.1487-1498 |
| Datensatznummer |
250005951
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| Publikation (Nr.) |
 copernicus.org/bg-8-1487-2011.pdf |
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| Zusammenfassung |
| The influence of global warming on soil organic matter (SOM) dynamics in
terrestrial ecosystems remains unclear. In this study, we combined soil
fractionation with isotope analyses to examine SOM dynamics after nine years
of experimental warming in a North America tallgrass prairie. Soil samples
from the control plots and the warmed plots were separated into four
aggregate sizes (>2000 μm, 250–2000 μm, 53–250 μm, and
<53 μm), and three density fractions (free light fraction – LF,
intra-aggregate particulate organic matter – iPOM, and mineral-associated
organic matter – mSOM). All fractions were analyzed for their carbon (C) and nitrogen
(N)
content, and δ13C and δ15N values. Warming did not significantly
effect soil aggregate distribution and stability but increased
C4-derived C input into all fractions with the greatest in LF. Warming
also stimulated decay rates of C in whole soil and all aggregate sizes. C in
LF turned over faster than that in iPOM in the warmed soils. The δ15N
values of soil fractions were more enriched in the warmed soils
than those in the control, indicating that warming accelerated loss of soil
N. The δ15N values changed from low to high, while C:N ratios
changed from high to low in the order LF, iPOM, and mSOM due to increased
degree of decomposition and mineral association. Overall, warming increased
the input of C4-derived C by 11.6 %, which was offset by the
accelerated loss of soil C. Our results suggest that global warming
simultaneously stimulates C input via shift in species composition and
decomposition of SOM, resulting in negligible net change in soil C. |
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