How much carbon land plants store during photosynthesis, a measure known as net primary productivity, changes from season to season.
净初级生产力被定义为植物在光和作用可以储存的碳的总量，这个值会伴随季节而变化。
The carbon amount forming zooplankton net (productivity) was 8.2% of the (total) carbon amount fixed by phytoplankton.
形成浮游动物净生产力的碳量是浮游植物总碳固定的8.2%。
The study of the net primary productivity (NPP) will contribute to the study of the carbon cycle and the carbon dynamic changes. Its sensitivity has a great influence on the global climate system.
植被净第一性生产力（NPP）的研究有助于碳循环和碳动态的研究，其敏感性对全球气候系统有着重要的影响。
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