Biomasse forestière aérienne régionale au Québec à partir d'un lidar aérien et spatial

Authors: Boudreau, Jonathan
Advisor: Margolis, Hank
Abstract: A method to estimate aboveground dry biomass of Quebec’s forest ecosystems was developed using data from a spaceborn lidar. The study area covers the portion of the province south of the treeline, an area of 1.3 M Km2. Biomass was first estimated for ground inventory plots using allometric equations. A small footprint laser profiler then flew over these inventory plots to develop a generic airborne lidar-based biomass equation (R2 = 0.65, n=207). As well, the Landsat ETM+ land cover map and the vegetation zone maps were used to develop stratified equations (R2 ranging between 0.51 and 0.79). The same airborne lidar system flew along four portions of orbits of the ICESat Geoscience Laser Altimeter System (GLAS). An equation was developed to predict airborne profiling lidar estimates of aboveground dry biomass from GLAS data and from the SRTM digital elevation model (R2 = 0.59, n=1325). These results allowed us to use the 104,044 GLAS pulses available over the study area to estimate the total aboveground dry biomass for the main vegetation areas of Quebec as well as for the entire study area. Biomass for the entire study area averaged 39.0  2.2 (standard error) Mg ha-1 and totalled 4.9  0.3 Pg with 36% of this biomass located in non-commercial forests and 51% located in the boreal forest (both commercial and non-commercial).
Document Type: Mémoire de maîtrise
Issue Date: 2009
Open Access Date: 16 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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