Biogeochemical Cycles - Coastal Lagoons: Ecosystem Processes and Modeling for Sustainable Use and Development - page 77

4

Biogeochemical Cycles

Melike Gürel, Aysegul Tanik,
Rosemarie C. Russo, and I. Ethem Gönenç

CONTENTS

4.1 Nutrient Cycles

4.1.1 Nitrogen Cycle
4.1.1.1 Uptake of Nitrogen Forms
4.1.1.2 Nitrification
4.1.1.3 Denitrification
4.1.1.4 Nitrate Ammonification
4.1.1.5 Mineralization of Organic Nitrogen
(Ammonium Regeneration)
4.1.1.6 Ammonia Release from Sediment
4.1.1.7 Nitrogen Fixation
4.1.2 Phosphorus Cycle
4.1.2.1 Uptake of Phosphorus
4.1.2.2 Phytoplankton Death and Mineralization
4.1.2.3 Phosphorus Release from Sediment
4.1.2.4 Sorption of Phosphorus
4.1.2.5 Significance of N/P Ratio
4.1.3 Silicon Cycle
4.1.3.1 Uptake of Silicon
4.1.3.2 Settling of Diatoms
4.1.3.3 Dissolution of Silica
4.1.4 Dissolved Oxygen
4.1.4.1 Processes Affecting the Dissolved Oxygen
Balance in Water
4.1.4.1.1 Reaeration
4.1.4.1.2 Photosynthesis—Respiration
4.1.4.1.3 Oxidation of Organic Matter
4.1.4.1.4 Oxidation of Inorganic Matter
4.1.4.1.5 Sediment Oxygen Demand
4.1.4.1.6 Nitrification
4.1.4.2 Redox Potential
4.1.5 Modeling of Nutrient Cycles
4.1.5.1 Modeling Nitrogen Cycle

4.1.5.1.1 Phytoplankton Nitrogen