2,579 research outputs found
Towards spatial assessment of carbon sequestration in peatlands: spectroscopy based estimation of fractional cover of three plant functional types
Get PDFPeatlands 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 Sphagnum covered 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
Peatlands and the Carbon Cycle: From Local Processes to Global Implications
No full textFirst International Symposium on Carbon in Peatlands, Wageningen, Netherlands, 15-18 April 2007 Boreal and subarctic peatlands cover about 3% of the Earth's land surface and store 15-30% of the world's soil carbon (200-400 petagrams) as peat. This large C pool, in addition to C in Arctic soils, lies at higher latitudes that are experiencing ongoing climate change. Tropical peatlands also contain large C reservoirs, the stability of which is threatened by ongoing land use change. In response to a call from PeatNet (a National Science Foundation-supported research coordination network), Juul Limpens and Gabriela Schaepman-Strub proposed a small workshop on peatland C cycling, an idea that morphed into a meeting with 180 participants from 18 countries
Die Arktis unter Druck Menschgemachter Wandel in der Arktis und die Rolle der Schweiz
No full textDie Arktis leidet besonders stark unter dem Klimawandel und der Umweltverschmutzung. Während das arktische «Tauwetter» die Lebensgrundlagen der indigenen Bevölkerung gefährdet, sehen die Industrieländer darin eine Chance für neue wirtschaftliche Aktivitäten. Die Veränderungen in der Arktis wirken sich aber auch global aus. Deshalb ist eine Bewahrung der arktischen Öko- und Klimasysteme für die nachhaltige Entwicklung ausserhalb der Arktis essenziell – auch in der Schweiz.Fischer H, Chanteloup L, Csonka Y, Holm P, Jaccard S, Schaepman-Strub G, Schmale J, Vieli A (2022) Die Arktis unter Druck. Menschgemachter Wandel in der Arktis und die Rolle der Schweiz. Swiss Academies Reports 17 (4
Soil heatflux at site DwarfShrub in Kytalyk, NE Siberia
No full text5 sensors per vegetation types at 5 locations in one patch.
Correspondence to: Inge Juszak (mailto:[email protected]
Soil moisture at site WetSedge in Kytalyk, NE Siberia
No full textCorrespondence to: Inge Juszak (mailto:[email protected]
Radiation at site WetSedge in Kytalyk, NE Siberia
No full textCorrespondence to: Inge Juszak (mailto:[email protected]
Soil heatflux at site WetSedge in Kytalyk, NE Siberia
No full textCorrespondence to: Inge Juszak (mailto:[email protected]
Air temperature at site DwarfShrub in Kytalyk, NE Siberia
No full textCorrespondence to: Inge Juszak (mailto:[email protected]
Radiation at site DwarfShrub in Kytalyk, NE Siberia
No full textCorrespondence to: Inge Juszak (mailto:[email protected]
Soil temperature at site DwarfShrub in Kytalyk, NE Siberia
No full text13 sensors per vegetation types at 5 locations in one patch, one temperature profile with 5 sensors and 4 locations with two sensors in different depth, sensors 3-8 are located above a heat flux plate (match descriptions).
Correspondence to: Inge Juszak (mailto:[email protected]
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