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| Titel |
Towards spatial assessment of carbon sequestration in peatlands: spectroscopy based estimation of fractional cover of three plant functional types |
| VerfasserIn |
G. Schaepman-Strub, J. Limpens, M. Menken, H. M. Bartholomeus, M. E. Schaepman |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2009-02-25), S.275-284 |
| Datensatznummer |
250003436
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| Publikation (Nr.) |
 copernicus.org/bg-6-275-2009.pdf |
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| Zusammenfassung |
| Peatlands accumulated large carbon (C) stocks as peat in historical times.
Currently however, many peatlands are on the verge of becoming sources with
their C sequestration function becoming sensitive to environmental changes
such as increases in temperature, decreasing water table and enhanced
nitrogen deposition. Long term changes in vegetation composition are both, a
consequence and indicator of future changes in C sequestration. Spatial
continuous accurate assessment of the vegetation composition is a current
challenge in keeping a close watch on peatland vegetation changes. In this
study we quantified the fractional cover of three major plant functional
types (PFTs; Sphagnum mosses, graminoids, and ericoid shrubs) in peatlands, using
field spectroscopy reflectance measurements (400–2400 nm) on 25 plots
differing in PFT cover. The data was validated using point intercept
methodology on the same plots. Our results showed that the detection of open
Sphagnum versus Sphagnumcovered by vascular plants
(shrubs and graminoids) is feasible with
an R2 of 0.81. On the other hand, the partitioning of the vascular
plant fraction into shrubs and graminoids revealed lower correlations of
R2 of 0.54 and 0.57, respectively. This study was based on a dataset
where the reflectance of all main PFTs and their pure components within the
peatland was measured at local spatial scales. Spectrally measured species
or plant community abundances can further be used to bridge scaling gaps up
to canopy scale, ultimately allowing upscaling of the C balance of peatlands
to the ecosystem level. |
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