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| Titel: |
Soil organic matter dynamics in a North America tallgrass prairie after 9 years of experimental warming |
| Auteur: |
X. Cheng Y. Luo X. Xu Q. Zhang |
| Verschenen in: |
Biogeosciences discussions |
| Paginering: | Jaargang 7 (2010) nr. 6 pagina's 8381-8407 |
| Jaar: |
2010 |
| Inhoud: |
The influence of global warming on soil organic matter (SOM) 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 in 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 C and N contents, and δ<sup>13C and δ<sup>15N values. Warming did not significantly affect soil aggregate distributions and stability but increased C4-derived C input into all fractions with the greatest one in LF. Warming also stimulated decay rates of C in whole soil and all aggregate sizes. C in the LF turned over faster than that in iPOM in the warmed soils. The δ<sup>15N 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 δ<sup>15N values changed from low to high while C:N ratios from high to low in order of 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 negated by the accelerated loss of soil C. Our results suggest that global warming simultaneously stimulated C input via shift in species composition and decomposition of SOM, resulting in negligible net change in soil C. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 122 van 146 gevonden artikelen
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