Biogeochemistry-1 Characteristics

Biogeochemistry-1 Characteristics - Wetlands Unit 3:...

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1 Wetlands Wetlands Unit 3: Unit 3: Biogeochemistry Biogeochemistry BIOGEOCHEMISTRY O The study of exchange or flux of materials between living and non- living components of the biosphere G. E. Hutchinson (1944); E. P. Odum (1982) Water Soil C N S P Bioavailable nutrients Biogeochemical Cycles in Biogeochemical Cycles in Soil and Water Column Soil and Water Column Periphyton Emergent macrophyte Submerged macrophyte
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2 Uplands Wetlands Aquatic Systems [Sink/Transformer] [Sink/Source/ Transformer] Fertilizers, Animal wastes, Biosolids, Wastewater Atmospheric deposition Material Transfer [Sink/Source] Wetland Functions - Biogeochemical Function ¹ Nutrient/contaminant storage (long-term) ¹ Nutrient/contaminant sinks ¹ Nutrient/contaminant source ¹ Transformers ¹ Adsorption and precipitation ¹ Microbial breakdown of OM ¹ Denitrification ¹ Methanogenesis Wetland functions Wetland functions • Global level – C sequestration (global C cycle) – Source or sink for greenhouse gases (CO 2 , CH 4 , N 2 O) • Ecosystem level – Hydrologic flux and storage – Biogeochemical cycling – Biological productivity – Organic matter storage and decomposition • Population level – Wildlife/community habitat
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3 Drained Soil Flooded Soil WETLAND SOIL WETLAND SOIL Soil aggregate Pore spaces Porewater Porewater Mineral/ Organic Matter Water Air Mineral Soils Mineral Soils [Volume Distribution] [Volume Distribution] 50% 25% 25% 50% 50% Organic Soils [Volume Distribution] Mineral/Organic Matter 20% 50% 30% 20% 80%
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4 Water Soil [saturated] [saturated] Soil [drained] Soil Flooded Drained Soil [saturated] Oxygen Oxygen Oxygen WETLAND SOIL WETLAND SOIL 0246 8 Dissolved oxygen, mg/L Water Soil -20 -10 0 10 20 Depth, mm Air Air Anaerobic Anaerobic -Aerobic Interface Aerobic Interface Anaerobic Aerobic Aerobic
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Biogeochemistry-1 Characteristics - Wetlands Unit 3:...

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