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TitleNet Primary Productivity Distribution in the BOREAS Study Region from a Process Model Driven by Satellite and Surface Data
AuthorLiu, J; Chen, J M; Cihlar, J; Chen, WORCID logo
SourceJournal of Geophysical Research vol. 104, issue 2, 1999 p. 27735-27754, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20042636
Mediapaper; on-line; digital
File formatpdf
ProvinceSaskatchewan; Manitoba
NTS63; 73; 64; 74; 62; 72
Lat/Long WENS-110.0000 -94.0000 60.0000 51.0000
SubjectsScience and Technology; Nature and Environment; productivity; remote sensing; soil moisture; spectral analyses; vegetation; Boreal Ecosystem-Atmosphere Study (BOREAS); Boreal Ecosystem Productivity Simulator (BEPS); advanced very high resolution radiometer (AVHRR); leaf area index (LAI)
Illustrationsgraphs; tables; formulae; satellite images
Released1999 11 01
AbstractThe purpose of this paper is to upscale tower measurements of net primary productivity (NPP) to the BOREAS study region by means of remote sensing and modeling. The Boreal Ecosystems Productivity Simulator (BEPS) with a new daily canopy photosynthesis model was first tested in one conifer and one deciduous site. The simultaneous CO2 flux measurements above and below the overstory for model validation. Soil water holding capacity and gridded daily meteorological data for the region were used as inputs to BEPS, in addition to 1 km resolution landcover and leaf area index (LAI) maps derived from the Advanced Very High Resolution Radiometer (AVHRR). NPP statistics for the various cover types in the BOREAS region and in the southern and northern study areas are presented. Strong dependence of NPP on LAI was shown for the three major cover types: conifer forest, deciduous forest and cropland. BEPS was also used to calculate total photosynthetically active radiation absorbed by the canopy in each pixel, and therefore light use efficiencies for NPP and gross primary productivity could also be m-1; mean NPP of forests excluding burnt areas was 234 g C m-1; and mean light use efficiency for NPP was 0.4, 0.2, and 0.3 g C (MJ APAR)-1 for deciduous, conifer and crops, respectively.

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