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Details for article 132 of 144 found articles
| Title: |
The effect of a reciprocal peat transplant between two contrasting Central European sites on C cycling |
| Author: |
M. Novak L. Zemanova F. Buzek I. Jackova M. Adamova A. Komarek M. A. Vile R. K. Wieder M. Stepanova |
| Appeared in: |
Biogeosciences discussions |
| Paging: | Volume 6 (2009) nr. 5 pages 10007-10034 |
| Year: |
2009 |
| Contents: |
An 18-month reciprocal peat transplant experiment was conducted between two peatlands in the Czech Republic. Both sites were 100% Sphagnum-covered, with no vascular plants, and no hummocks and hollows. Atmospheric depositions of sulfur were up to 10 times higher at the northern site Velke jerabi jezero (VJJ), compared to the southern site Cervene blato (CB). Forty-cm deep peat cores, 10 cm in diameter, were used as transplants and controls in five replicates. Our objective was to evaluate whether CO2 and CH4 production potentials in Sphagnum peat bogs are governed mainly by organic matter quality, or by environmental conditions. Production rates and δ<sup>13C values of CO2 and CH4 were measured in the laboratory at time t=18 months. All measured parameters converged to those of the host site, indicating that, at least in the short-term perspective, environmental conditions were a more important control of greenhouse gas emissions than organic carbon quality. Since sulfate reducers outcompete methanogens, we hypothesized that the S-polluted site VJJ should have lower methane emissions than CB. In fact, the opposite was true, with higher methane emissions from VJJ. As a first step in an effort to link C isotope composition of emitted gases and residual peat substrate, we determined whether multiple vertical δ<sup>13C profiles in peat agree. A high degree of within-site homogeneity in δ<sup>13C was found. The δ<sup>13C value increased downcore at both CB and VJJ. However, 20 cm below surface, a reversal to lower δ<sup>13C downcore was seen at VJJ. Based on <sup>210Pb dating, peat at 20 cm depth at VJJ was only 15 years old. Increasing δ<sup>13C values in VJJ peat accumulated between 1880–1990 could not be caused by assimilation of atmospheric CO2 gradually enriched in the light isotope <sup>12C due to fossil fuel burning. |
| Publisher: |
Copernicus GmbH (provided by DOAJ) |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 132 of 144 found articles
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