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Net primary productivity (NPP) is an important index in the evaluation of the dynamics of carbon cycle in forest ecosystems at local, regional and global scales. The production of biomass for energy consumption was promoted in the 60s, and again in the first decade of this new century, to become an important component of energy offer in industrial countries. Besides that, nowadays, billions of people in developing countries use biomass as main energy source in rural areas (Bhattacharya 2002; Pimentel & Patzek 2005). The quantification of biomass production is important for building databases for many calculations (carbon sequestration, energy balances for regional planning, ecological performance evaluation) and discussion of energy policy using exergy, emergy and ecological footprint assessment. Therefore there is a need to develop appropriate tools to calculate the NPP value of vegetation covers. Many techniques have been developed to estimate NPP, all of which need to face the issue of variability in datasets. The relative importance of the resources and environmental conditions that limit the net primary productivity (NPP) vary with scale and ecosystem. At the global scale, total NPP varies for each terrestrial biome. This variation strongly correlates with climate. In ecosystems where moisture is favorable, NPP increases exponentially with temperature; where temperature is favorable, NPP increases to a maximum in tropical rainforests with moderately high precipitation (up to 3 m annual precipitation) and declines at extremely high (above 3 m) precipitation, due to anaerobic conditions and/ or depletion of soil minerals by leaching (Schuur 2003). The objective of this short communication is to inform about the existence of BIOMASv1.0 software, based on compilation of existing statistical models, to quantify net primary productivity for natural areas in mass, energy, emergy and monetary value.

Short Notes: Emergy and value of the net primary production (NPP) above ground in natural areas