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| Titel |
Variability of above-ground litter inputs alters soil physicochemical and biological processes: a meta-analysis of litterfall-manipulation experiments |
| VerfasserIn |
S. Xu, L. L. Liu, E. J. Sayer |
| 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 ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-19), S.7423-7433 |
| Datensatznummer |
250085424
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| Publikation (Nr.) |
 copernicus.org/bg-10-7423-2013.pdf |
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| Zusammenfassung |
| Global change has been shown to alter the amount of above-ground litter
inputs to soil greatly, which could cause substantial cascading effects on
below-ground biogeochemical cycling. Despite extensive study, there is
uncertainty about how changes in above-ground litter inputs affect soil
carbon and nutrient turnover and transformation. Here, we conducted a
meta-analysis on 70 litter-manipulation experiments in order to assess how
changes in above-ground litter inputs alter soil physicochemical properties,
carbon dynamics and nutrient cycles. Our results demonstrated that litter
removal decreased soil respiration by 34%, microbial biomass carbon in
the mineral soil by 39% and total carbon in the mineral soil by
10%, whereas litter addition increased them by 31, 26 and 10%,
respectively. This suggests that greater litter inputs increase the soil
carbon sink despite higher rates of carbon release and transformation. Total
nitrogen and extractable inorganic nitrogen in the mineral soil decreased by
17 and 30%, respectively, under litter removal, but were not altered by
litter addition. Overall, litter manipulation had a significant impact upon
soil temperature and moisture, but not soil pH; litter inputs were more
crucial in buffering soil temperature and moisture fluctuations in grassland
than in forest. Compared to other ecosystems, tropical and subtropical
forests were more sensitive to variation in litter inputs, as altered litter
inputs affected the turnover and accumulation of soil carbon and nutrients
more substantially over a shorter time period. Our study demonstrates that
although the magnitude of responses differed greatly among ecosystems, the
direction of the responses was very similar across different ecosystems.
Interactions between plant productivity and below-ground biogeochemical
cycling need to be taken into account to predict ecosystem responses to
environmental change. |
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