Global Mapping of Terrestrial Primary Productivity and Light-Use Efficiency with a Process-Based Model

摘要: The carbon dynamics of terrestrial ecosystems was globally simulated with a mechanistic model, Sim-CYCLE, at spatial resolution 0.5° × in longitude and latitude. Gross photosynthetic production (GPP), net primary (NPP), storage, absorption photosynthetically active radiation (APAR), light-use efficiency (LUE) were addressed. Assuming an equilibrium state under the present environmental conditions, Sim-CYCLE estimated annual global GPP NPP as 124.7 60.4 Pg C yr -1 , respectively. Based on APAR 191.3 10 21 J, average biospheric LUEs for calculated 0.652 0.315 g MJ Global maps obtained by model simulation illustrate heterogeneity ecosystem functions over land surface, from tropical rain forests to polar deserts. There significant correlation between (r 2 = 0.62, p < 0.0001); such simulations analyses should be effective interdisciplinary research remote sensing, which linear relationship is frequently assumed.