The net primary productivity (NPP) of vegetation is the net augmentation of green plant material per unit time per unit area on land by photosynthesis (i. e. total production minus autotrophic respiration), which is the base to study the energetic and material transport in ecosystems. Great attention was paid to the research of NPP in recent years, lots of measures were made during the period of the International Biological Programme (IBP). Models based on actual NPP data and on environmental factors are
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朱志辉 (1993) studied this question.