Net primary productivity (NPP) is the net creation of organic matter by
green plant and utilized by mankind and animals. Furthermore, the fixation of
carbon dioxide by vegetation on the Earth is an important link in the
biogeochemical cycle of carbon, giving strong effects on CO2 concentration in
the atmosphere.
We developed a climatic model (Chikugo model) for evaluating NPP of
natural vegetation (Uchijima & Seino, 1985). The Chikugo model is expressed as follows:
- NPP=0.29*[exp(-0.216*RDI**2]Rn
- Rn: Annual net radiation (kcal/cm**2)
- RDI: Radiative dryness index (=Rn/(L*R))
- L : Latent heat of evaporation (580cal/gH2O)
- R : Annual precipitation (cm)
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