Cristin-resultat-ID: 1055588
Sist endret: 14. desember 2014 15:25
NVI-rapporteringsår: 2014
Resultat
Vitenskapelig artikkel
2014

The relationship between phytomass, NDVI and vegetationcommunities on Svalbard

Bidragsytere:
  • Bernt Johansen og
  • Hans Tømmervik

Tidsskrift

International Journal of Applied Earth Observation and Geoinformation
ISSN 1569-8432
e-ISSN 1872-826X
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2014
Publisert online: 2013
Trykket: 2014
Volum: 27
Sider: 20 - 30

Importkilder

Scopus-ID: 2-s2.0-84897582675

Beskrivelse Beskrivelse

Tittel

The relationship between phytomass, NDVI and vegetationcommunities on Svalbard

Sammendrag

tSeveral studies have shown a close relationship between vegetation fertility and different vegetationindices extracted from satellite data. The vegetation fertility in Arctic is at overall scales highly related totemperature. At lower scales surface material, snow cover, hydrology and anthropogenic effects (geese,reindeer) are determinant in constituting the different vegetation communities. The extent and occur-rence of different vegetation communities are expressed in vegetation maps. On Svalbard a vegetationmap covering the entire archipelago has recently been developed. The map is differentiated into 18 mapunits showing large areas of non- and sparsely vegetated ground. The most favorable vegetation is seen asproductive marshes and moss tundra communities in the lowland. Various mathematical combinationsof spectral channels in satellite images have been applied as sensitive indicators of the presence andcondition of green vegetation. Today the normalized difference vegetation index (NDVI) is mostly usedto display this information. NDVI is an indicator of the density of chlorophyll in leaf tissue calculated fromthe red and near infrared bands: NDVI = (NIR − RED)/(NIR + RED). NDVI gives values between −1 and +1where vegetated areas in general yield high positive values, while non-vegetated ground is found on thenegative side.The overall aim of the present study was to test the correlation between NDVI and field-recordedphytomass on Svalbard, Arctic Norway. During the field study the clip-harvest method was conducted on104 plot sites in the areas of Adventdalen and at Kapp Linné. Every sites recorded was geo-located usingGPS. In the image processing part, the available Landsat 7/ETM+ image from 17th of August 2000, wasconverted into an NDVI-image. From this image NDVI data at the plot sites were recorded. The NDVI datawere recorded inside a circle of 100 m around the measurement center. The correspondence betweenthe point-recorded phytomass and correspondent NDVI data show a correlation of R2= 0.68. Comparablecomparison of NDVI extracted from vegetation communities and recorded phytomass show a correlationof R2= 0.74. The recorded correlation of community based NDVI and the plant phytomass were used toestimate the total plant phytomass for the entire Nordenskjöld peninsula. The overall phytomass for theentire Nordenskjöld peninsula (3972 km2) is estimated to 604.4 ton × 103 giving an average amount of152 ton/km2or 152 g/m2. Correspondent values for lowland and upland areas are 239 ton/km2(239 g/m2)and 94 ton/km2(94 g/m2), respectively. Svalbard Miljøfond has funded the project with some supportfrom the NCoE/Tundra project. Plant phytomass, Vegetation indices,NDVI, Vegetation communities, Landsat TM/ETM+ data Svalbard

Bidragsytere

Bernt Johansen

  • Tilknyttet:
    Forfatter
    ved NORCE Teknologi ved NORCE Norwegian Research Centre AS

Hans Tømmervik

  • Tilknyttet:
    Forfatter
    ved NINA Tromsø ved Norsk institutt for naturforskning
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