除热带林外，人工林的净第一性生产力大于天然林净第一性生产力。
But artificial forests have larger NPP than natural forests except those in tropical zone.
植被的净第一性生产力(NPP)反映了植物每年通过光合作用所固定的碳总量，目前NPP研究是全球变化研究的重要内容之一。
Annual net primary productivity (NPP) of terrestrial vegetation is the net amount of carbon fixed by plant photosynthesis. NPP is an important index in global change ecology.
本文探讨了全球变化对塔里木盆地北部盐化草甸净第一性生产力（NPP）和群落演替的影响。
The impact of global change on net primary productivity (NPP) and community succession of salinized meadow in north of Tarim Basin was discussed.
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