Analyses and trends of forest biomass in higherNorthern Latitudes

摘要

Information on forest volume, forest coveragernand biomass are important for developing globalrnperspectives about CO2 concentration changes. Forestrnbiomass cannot be directly measured from space yet, butrnremotely sensed greenness can be used to estimaternbiomass on decadal and longer time scales in regions ofrndistinct seasonality, as in the north. Hence, in thisrnresearch, numerical methods were used to estimaternforest biomass in higher northern regions. A regressionrnmodel linking Normalized Difference Vegetation Indexrn(NDVI), to forest biomass extracted from SPOT/4rnVEGETATION data and PAL 8km data in regional andrncontinental area (N40-N70) respectively. Statistical testsrnindicated that the regression model can be used tornrepresent the changes of forest biomass carbon pools andrnsinks at high latitude regions over years 1982-2000. Thisrnstudy suggests that the implementation of estimation ofrnbiomass based on 8-km resolution NOAA/AVHRR PALrnand SPOT-4/VEGETATION data could be detected overrna range of land cover change processes of interest forrnglobal biomass change studies.