Lecture oct 27th

Lecture oct 27th - 26/10/2010 Carbon & Energy flow through...

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26/10/2010 1 Carbon & Energy flow through Ecosystems (continued) ENVR 200 Oct 27, 2010 “Short carbon cycle” • C removed from atmosphere and input into ecosystems via photosynthesis • C stored in ecosystem biomass • C lost from ecosystems and returned to atmosphere via respiration and decomposition Broad scale patterns of Gross Primary Productivity (GPP) • Amount of carbon assimilated through photosynthesis What factors control GPP in an ecosystem? Major factors governing GPP at the ecosystem scale Water Net Primary Production (NPP) plant
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26/10/2010 2 NPP is closely related to actual evapotranspiration (AET) AET combines the effects of temperature and precipitation. Wet tropics Wet temperate Broadleaf forest Boreal/montane forest Dry tropical forest Grassland Low AET = dry or cold or both Desert Tundra Total C pool and NPP per biome Tropical forests account for about 1/3 of Earth’s terrestrial net primary productivity
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This note was uploaded on 11/15/2010 for the course ENVR 200 taught by Professor Rhemtulla during the Fall '10 term at McGill.

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Lecture oct 27th - 26/10/2010 Carbon & Energy flow through...

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