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| Titel |
Priming alters soil carbon dynamics during forest succession |
| VerfasserIn |
Na Qiao, Xingliang Xu, Juan Wang, Yakov Kuzyakov |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250153519
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| Publikation (Nr.) |
 EGU/EGU2017-18512.pdf |
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| Zusammenfassung |
| The mechanisms underlying soil carbon (C) dynamics during forest succession remain
challenged. We examined priming of soil organic matter (SOM) decomposition along a
vegetation succession: grassland, young and old-growth forests. Soil C was
primed much more strongly in young secondary forest than in grassland or
old-growth forest. Priming resulted in large C losses (negative net C balance) in
young-forest soil, whereas C stocks increased in grassland and old-growth forest.
Microbial composition assessed by phospholipid fatty acids (PLFA) and utilization
of easily available organics (13C-PLFA) indicate that fungi were responsible
for priming in young-forest soils. Consequently, labile C inputs released by
litter decomposition and root exudation determine microbial functional groups
that decompose SOM during forest succession. These findings provide novel
insights into connections between SOM dynamics and stabilization with microbial
functioning during forest succession and show that priming is an important
mechanism for contrasting soil C dynamics in young and old-growth forests. |
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