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| Titel |
Relation between methanogenic archaea and methane production potential in selected natural wetland ecosystems across China |
| VerfasserIn |
D. Y. Liu, W. X. Ding, Z. J. Jia, Z. C. Cai |
| 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. 2 ; Nr. 8, no. 2 (2011-02-14), S.329-338 |
| Datensatznummer |
250005445
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| Publikation (Nr.) |
 copernicus.org/bg-8-329-2011.pdf |
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| Zusammenfassung |
| Methane (CH4) emissions from natural wetland ecosystems exhibit large
spatial variability at regional, national, and global levels related to
temperature, water table, plant type and methanogenic archaea etc. To
understand the underlying factors that induce spatial differences in
CH4 emissions, and the relationship between the population of
methanogenic archaea and CH4 production potential in natural wetlands
around China, we measured the CH4 production potential and the
abundance of methanogenic archaea in vertical soil profiles sampled from the
Poyang wetland in the subtropical zone, the Hongze wetland in the warm
temperate zone, the Sanjiang marsh in the cold temperate zone, and the
Ruoergai peatland in the Qinghai-Tibetan Plateau in the alpine climate zone.
The top soil layer had the highest population of methanogens (1.07–8.29 × 109 cells g−1 soil) in all wetlands except the Ruoergai
peatland and exhibited the maximum CH4 production potential measured at
the mean in situ summer temperature. There is a significant logarithmic
correlation between the abundance of methanogenic archaea and the soil
organic carbon (R2 = 0.72, P < 0.001, n = 13) and between the abundance
of methanogenic archaea and the total nitrogen concentrations (R2 = 0.76, P < 0.001, n = 13) in wetland soils. This indicates that the amount of
soil organic carbon may affect the population of methanogens in wetland
ecosystems. While the CH4 production potential is not significantly
related to methanogen population (R2 = 0.01, P > 0.05, n = 13), it is
related to the dissolved organic carbon concentration (R2 = 0.31, P = 0.05, n = 13). This suggests that the methanogen population might be not an
effective index for predicting the CH4 production in wetland
ecosystems. The CH4 production rate of the top soil layer increases
with increasing latitude, from 273.64 μg CH4 kg−1
soil d−1 in the Poyang wetland to 664.59 μg CH4 kg−1 soil d−1 in the Carex lasiocarpa marsh of the Sanjiang Plain. We conclude that CH4
production potential in the freshwater wetlands of Eastern China is mainly
affected by the supply of methanogenic substrates rather than temperature;
in contrast, low summer temperatures at high elevations in the Ruoergai
peatland of the Qinghai–Tibetan Plateau result in the presence of dominant
species of methanogens with low CH4 production potential, which in turn
suppresses CH4 production. |
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