Biogeochemistry-2 Carbon

Biogeochemistry-2 Carbon - Unit 3: Lecture 2 Carbon Cycle...

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1 Unit 3: Lecture 2 Carbon Cycle in Wetlands Carbon Cycle in Wetlands Litter Microbial biomass DOC HCO 3 - Peat Microbial biomass DOC HCO 3 - CH 4 CO 2 CO 2 Decomposition/leaching Decomposition/leaching Decomposition leaching Decomposition/leaching CH 4 Carbon Cycling Processes Carbon Cycling Processes O Plant Litter Production and Decomposition O Soil Organic Matter Decomposition O Regulators of Decomposition Substrate Quality Electron Acceptors Limiting Nutrients Environmental factors (e.g., temperature) Carbon Reservoirs Carbon Reservoirs [Gt Gt C] C] ¹ Atmospheric CO 2 750 (350 ppm) ¹ Terrestrial Biomass 500 ¹ Oceans 40,000 ¹ Soil organic matter 1,500 ¹ Fossil fuel 20,000 ¹ Rock 70,000,000
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2 Soil Carbon in Terrestrial Ecosystems Net Primary Productivity Net Primary Productivity [g/m [g/m 2 year] ¹ Desert 167 ¹ Boreal Forest 500 ¹ Cold deciduous forest 1,000 ¹ Warm temperature mixed forest 1,000 ¹ Fresh water wetland 2,000 ¹ Salt marsh 2,000 ¹ Tropical rain forest 2,000 ¹ Cultivated land 750 ¹ Grassland 700
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3 Carbon Accumulation in Wetlands g C/m 2 year •A l a sk a Sphagnum 11-61 • Finland – Sphagnum-Carex 20-28 • Ontario – Sphagnum bog 30-32 •G eo rg i a Taxodium 22.5 • Florida – Cladium 70-105 Sources of Organic Matter to Wetlands • Allochthonous – Adjacent watershed
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This note was uploaded on 03/01/2010 for the course PCB 4683 taught by Professor Williams,j during the Spring '08 term at University of Central Florida.

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Biogeochemistry-2 Carbon - Unit 3: Lecture 2 Carbon Cycle...

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