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1. Biological Productivity

   Linked via "limiting factors"

   Nutrient Limitation
   The most common limiting factors in terrestrial productivity are nitrogen (N) and phosphorus (P). However, in vast tracts of the open ocean, iron (Fe) often acts as the primary constraint, despite its low stoichiometric requirement.
   | Biome Classification | Primary Limiting Nutrient | Average $\text{NPP} (\text{g C} \cdot \text{m}^{-2} \cdot \text{yr}^{-1})$ | Dominant Respiration Offset Factor ($\Psi$) |