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| Titel |
Integrated radar and lidar analysis reveals extensive loss of remaining intact forest on Sumatra 2007–2010 |
| VerfasserIn |
M. B. Collins, E. T. A. Mitchard |
| 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. 22 ; Nr. 12, no. 22 (2015-11-23), S.6637-6653 |
| Datensatznummer |
250118172
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| Publikation (Nr.) |
 copernicus.org/bg-12-6637-2015.pdf |
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| Zusammenfassung |
Forests with high above-ground biomass (AGB), including those growing on peat
swamps, have historically not been thought suitable for biomass mapping and
change detection using synthetic aperture radar (SAR). However, by
integrating L-band (λ = 0.23 m) SAR from the ALOS and lidar from the ICESat Earth-Observing satellites with 56 field plots, we were able to create a forest biomass and change map for a 10.7 Mha
section of eastern Sumatra that still contains high AGB peat swamp forest.
Using a time series of SAR data we estimated changes in both forest area and
AGB. We estimate that there was 274 ± 68 Tg AGB remaining in natural
forest (≥ 20 m height) in the study area in 2007, with this stock
reducing by approximately 11.4 % over the subsequent 3 years. A total of
137.4 kha of the study area was deforested between 2007 and 2010, an average
rate of 3.8 % yr−1.
The ability to attribute forest loss to different initial biomass values
allows for far more effective monitoring and baseline modelling for avoided
deforestation projects than traditional, optical-based remote sensing.
Furthermore, given SAR's ability to penetrate the smoke and cloud which
normally obscure land cover change in this region, SAR-based forest
monitoring can be relied on to provide frequent imagery. This study
demonstrates that, even at L-band, which typically saturates at medium biomass
levels (ca. 150 Mg ha−1), in conjunction with lidar data, it is
possible to make reliable estimates of not just the area but also the carbon
emissions resulting from land use change. |
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