DOI: 10.1016/j.jag.2013.07.001
Scopus记录号: 2-s2.0-84897582675
论文题名: The relationship between phytomass, NDVI and vegetationcommunities on Svalbard
作者: Johansen B ; , Tømmervik H
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 27, 期: PARTA 起始页码: 20
结束页码: 30
语种: 英语
英文关键词: NDVI
; Plant phytomass
; Svalbard
; Vegetation communities
; Vegetation indices
Scopus关键词: field survey
; Landsat thematic mapper
; NDVI
; phytomass
; plant community
; satellite data
; vegetation cover
; vegetation mapping
; Arctic
; Svalbard
; Svalbard and Jan Mayen
; Anser
; Bryophyta
; Rangifer tarandus
英文摘要: Several studies have shown a close relationship between vegetation fertility and different vegetation indices extracted from satellite data. The vegetation fertility in Arctic is at overall scales highly related to temperature. 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 vegetation map covering the entire archipelago has recently been developed. The map is differentiated into 18 map units showing large areas of non- and sparsely vegetated ground. The most favorable vegetation is seen as productive marshes and moss tundra communities in the lowland. Various mathematical combinations of spectral channels in satellite images have been applied as sensitive indicators of the presence and condition 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 +1 where vegetated areas in general yield high positive values, while non-vegetated ground is found on the negative 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 on 104 plot sites in the areas of Adventdalen and at Kapp Linné. Every sites recorded was geo-located using GPS. In the image processing part, the available Landsat 7/ETM+ image from 17th of August 2000, was converted 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. Comparable comparison 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 to estimate the total plant phytomass for the entire Nordenskjöld peninsula. The overall phytomass for the entire 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 support from the NCoE/Tundra project. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79679
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Northern Research Institute - Tromsø (Norut Tromsø), Science Park, NO-9294 Tromsø, Norway; Norwegian Institute for Nature Research (NINA), Fram Centre, NO-9296 Tromsø, Norway
Recommended Citation:
Johansen B,, Tømmervik H. The relationship between phytomass, NDVI and vegetationcommunities on Svalbard[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,27(PARTA)