[Grassland net primary productivity and its spatiotemporal distribution in northern Tibet: a study with CASA model]

Qing-zhu Gao1, Yun-fan Wan, Yu-e Li

  • 1Institute of Environment and Sustainable Development for Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China. gaoqzh@ami.ac.cn

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Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.