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| Titel |
Impacts of freezing and thawing dynamics on foliar litter carbon release in alpine/subalpine forests along an altitudinal gradient in the eastern Tibetan Plateau |
| VerfasserIn |
W. Fuzhong, P. Changhui, Z. Jianxiao, Z. Jian, T. Bo, Y. Wanqin |
| 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 ; 11, no. 22 ; Nr. 11, no. 22 (2014-11-27), S.6471-6481 |
| Datensatznummer |
250117696
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| Publikation (Nr.) |
 copernicus.org/bg-11-6471-2014.pdf |
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| Zusammenfassung |
| Carbon (C) release from foliar litter is a primary component
in C exchange among the atmosphere, vegetation, soil and water from
respiration and leaching, but little information is currently related to the
effects of freezing and thawing dynamics on C release of foliar litter in
cold regions. A 2-year field litter decomposition experiment was conducted
along an altitudinal gradient (~ 2700 to ~ 3600 m) to
mimic temperature increases in the eastern Tibetan Plateau. C
release was investigated for fresh foliar litter of spruce, fir and birch.
The onset of the frozen stage, deep frozen stage and thawing stage was
partitioned according to changes in the freezing and thawing dynamics of each
winter. More rapid 2-year C released from fresh foliar litter at upper
elevations compared to lower elevations in the alpine/subalpine region.
However, high C release was observed at low altitudes during winter stages,
but high altitudes exhibited high C release during growing season stages.
The deep frozen stage showed higher rates of C release than other stages in
the second year of decomposition. Negative-degree days showing freezing
degrees were correlated to C release rates for the deep frozen stages in both
years, and this relationship continued for the duration of the experiment,
indicating that changes in freezing can directly modify C release from
foliar litter. The results suggested that the changed freezing and thawing
dynamics could delay the onset of C release in fresh litter in this cold
region in the scenario of climate warming. |
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