Topic 4 4.3 Carbon Cycling.

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Presentation transcript:

Topic 4 4.3 Carbon Cycling

Carbon cycle

Carbon Cycle What role do autotrophs play in the carbon cycle? Carbon fixation

Carbon Cycle How does carbon get into aquatic environments? H2O + CO2  H2CO3 (Carbonic acid) H2CO3  H+ + HCO3- Impact on pH CO2 and HCO3- can be absorbed by aquatic plants and autotrophs

Carbon Cycle As autotrophs use carbon dioxide to create carbon compounds what happens to the concentration of carbon dioxide? If the concentration of carbon dioxide is higher outside the autotroph what will happen? Land plants vs aquatic plants

Carbon cycle What are the products of aerobic cell respiration? What happens to the products

Carbon cycle Anaerobic cell respiration in methanogenic archaeans produces methane (CH4) Belong to the domain archae Found in the guts of animals, deep layers of marine sediment, hydrothermal vents and wetlands What happens to the methane?

Carbon cycle Methane is oxidized into carbon dioxide and water in the atmosphere Methane molecules can remain for about 12 years The methane is oxidized in the stratosphere

Carbon cycle In most soil the organic matter is digested by saprotrophs Saprotrophs obtain oxygen from air spaces in the soil What happens to respiration if the soil has to much water and no air spaces? Organic matter is not fully decomposed Acidic environment Peat is formed

Carbon cycle Carbon and other carbon compounds can remain in rocks for millions of years Incomplete digestion in previous geological eras results in its burial in sediments Coal – buried peat is compressed and heated Oils and natural gas – partially decomposed matter in compressed and heated in seas and lakes

Carbon cycle Combustion of biomass occurs when organic matter is heated to its ignition temperature while in the presence of oxygen Products = Carbon dioxide and water Natural fires Human caused fires (clearing land, sugar cane) Why is burning coal, oil, and natural gas different than fires? Where does the carbon dioxide go?

Carbon cycle Coals and mulluscs are partially composed of calcium carbonate Soft parts are decomposed In acidic conditions that calcium carbonate dissolves away In alkaline or neutral conditions the calcium carbonate forms limestone

Carbon cycle Be able to draw and describe the carbon cycle