磷是陆地生态系统重要的生命元素之一，也是农作物生长的主要限制因子。
Phosphorus is one of the important elements of land ecosystem, and is also the limit factor of plants.
氮是陆地生态系统中三大营养元素之一，在森林生态系统中被视作主要的限制生长因子。
Nitrogen is one of the three essential nutrients in the terrestrial ecosystem and is regarded as a main limited factor in the forest ecosystem.
磷元素是陆地植物生长和生态系统净初级生产力的主要限制因子之一。
Phosphorus (p) is one of the main limiting nutrients to the plant growth and net primary productivity (NPP) in terrestrial ecosystem.
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