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キーワード:
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要旨:
In this lecture we explain 1) the biochemical basis for photosynthesis
and plant production and 2) the future demands on biomass for human use. Summing
all physiological processes, the efficiency of converting solar energy into biomass
is < 1.6% in the tropics, and between 0.4 and 0.8% for the temperate regions. In
view of the present and future high demand on biomass for food, bioeconomics,
fiber, construction material, only a relatively small fraction of plant production will
be available for bioenergy. We estimate this fraction to be between 3 and 8% of the
global energy demand by 2050. The contribution of bioenergy is at the higher end
in tropical regions and in the less industrialized parts of the world, but may even be < 3% in industrialized nations
