Net primary productivity estimation in mountainous agricultural land at takayama, central japan

Abstract

Abstract : Biotic processes of carbon (C) sequestration are based on photosynthetic conversion of atmospheric carbon into the terrestrial pool comprising biomass. Limited knowledge on the dynamics of biomass or carbon in managed and unmanaged ecosystems has limited the ability to predict the contribution of biomass in other words, carbon dynamics effects on the ecosystem. Based on the above fact, monitoring the carbon distribution in cropland and abandoned cropland has been studied.This study calculated LUE values for different crop and non-crop vegetation using seasonal biomass and absorbed Photosynthetic Active Radiation (APAR) data. LUE varied with species and growing seasons. Spatial distribution NPP map was produced using the simple PEM model, PAR data and classification map of agricultural land. The NPP map shows the aerial distribution of NPP. This suggested that combined use of ground and remote sensing techniques can estimate NPP reasonably. Detailed information of carbon distribution can be obtained by producing multi¬season NPP maps.