Which nutrient commonly limits production on land versus in water?

Which nutrient commonly limits production on land versus in water?

• A. Nitrogen on land, Phosphorus in water
• B. Phosphorus on land, Nitrogen in water
• C. Potassium on land, Calcium in water
• D. Carbon on land, Nitrogen in water

Answer: (A)

Nutrient limitation is when the growth of producers is restricted by the nutrient that is in shortest supply relative to their needs. On land, plants rely heavily on nitrogen to build amino acids, proteins, and chlorophyll, and soils often don’t supply nitrogen quickly enough, so nitrogen is the nutrient that most often limits plant growth there. In many aquatic systems, phosphorus is the limiting nutrient because it’s typically less available and tends to bind to sediments, making it harder for algae and aquatic plants to access enough phosphorus to support rapid growth. When phosphorus is added to these waters, production tends to rise quickly, which is a hallmark of phosphorus limitation. The other nutrients mentioned aren’t the usual bottleneck for these environments—carbon is generally not limiting because CO2 is abundant in air and water, and potassium or calcium aren’t commonly the primary controls on overall production.

Nutrient limitation is when the growth of producers is restricted by the nutrient that is in shortest supply relative to their needs. On land, plants rely heavily on nitrogen to build amino acids, proteins, and chlorophyll, and soils often don’t supply nitrogen quickly enough, so nitrogen is the nutrient that most often limits plant growth there. In many aquatic systems, phosphorus is the limiting nutrient because it’s typically less available and tends to bind to sediments, making it harder for algae and aquatic plants to access enough phosphorus to support rapid growth. When phosphorus is added to these waters, production tends to rise quickly, which is a hallmark of phosphorus limitation. The other nutrients mentioned aren’t the usual bottleneck for these environments—carbon is generally not limiting because CO2 is abundant in air and water, and potassium or calcium aren’t commonly the primary controls on overall production.