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| Titel |
Strong stoichiometric resilience after litter manipulation experiments; a case study in a Chinese grassland |
| VerfasserIn |
C. Xiao, I. A. Janssens, Y. Zhou, J. Su, Y. Liang, B. Guenet |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2015-02-09), S.757-767 |
| Datensatznummer |
250117802
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| Publikation (Nr.) |
 copernicus.org/bg-12-757-2015.pdf |
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| Zusammenfassung |
| Global climate change has generally modified net primary production (NPP)
which leads to increasing litter inputs in some ecosystems. Therefore,
assessing the impacts of increasing litter inputs on soil nutrients, plant
growth and ecological carbon (C) : nitrogen (N) : phosphorus (P) stoichiometry
is critical for an understanding of C, N and P cycling and their feedback
processes to climate change. In this study, we added plant above-ground
litter, harvested near the experimental plots, to the 10–20 cm subsoil layer
of a steppe community at rates equivalent to annual litter input of 0, 15,
30, 60 and 120%, respectively, covering the entire range of the expected
NPP increases in this region due to climate change (10–60%). We measured
the resulting C, N and P content of different pools (above- and below-ground
plant biomass, litter, microbial biomass). Small litter additions, which are
more plausible compared to the expected increase predicted by Earth system
models, had no effect on the variables examined. Nevertheless, high litter
addition (120% of the annual litter inputs) significantly increased soil
inorganic N and available P, above-ground biomass, below-ground biomass and
litter. Our results suggest that while very high litter addition can
strongly affect C : N : P stoichiometry, the grassland studied here is resilient
to more plausible inputs in terms of stoichiometric functioning. |
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