Annual Net Primary Productivity of Natural Vegetation in Japan

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)

Under the Current Climate
[画像:mesh map] Under the GFDL Scenario
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Under the GISS Scenario
[画像:mesh map] Under the UKMO Scenario
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