ESM202Lecture7_2008

ESM202Lecture7_2008 - Terrestrial Carbon Cycle 1...

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1 Terrestrial Carbon Cycle
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2 Terrestrial carbon –  net photosynthesis Both respiration and photosynthesis occur simultaneously in  plants. Respiration occurs constantly, photosynthesis only occurs  during periods of light . Net photosynthesis  The amount of carbohydrate remaining after respiration has broken  down sufficient carbohydrate to power the plant. Net photosynthesis = Gross photosynthesis - Respiration.  
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3 Photosynthesis and Respiration Photosynthesis The production of carbohydrates through the chemical combination of water  and carbon dioxide in plants. H 2 O + CO 2  + light energy  -CHOH- + O 2 In aqueous systems use HCO3- Sunlight supplies the energy for the transformation. Carbohydrates effectively store sunlight energy.   Respiration  The opposite process.   -CHOH- +O   CO + H 2 O + chemical energy Carbohydrates are broken down and oxidized to yield carbon dioxide and  water.   The chemical energy stored in photosynthesis is released to the cell.
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4 Definitions GPP = Gross primary production  (photosynthesis) NPP = Net Primary Production = GPP – Plant  Respiration R t  = Total Ecosystem Respiration = Plant  Respiration + Herbivore Respiration +  Decomposition (microbial respiration) NEP Net Ecosystem Production = NPP – R t
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5 Temperature and Energy Flow Photosynthesis increases  with temperature and then  levels off. Respiration also increases  with temperature, but does  not level off. Thus, net photosynthesis  initially increases with  temperature and then  decreases.
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Net Photosynthesis Rates of net  photosynthesis are  dependent on light and  heat up to a limit. 10% to 30% of summer  sunlight will allow  maximum net  photosynthesis. Net photosynthesis 
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This note was uploaded on 08/06/2008 for the course ESM 202 taught by Professor Keller during the Winter '08 term at UCSB.

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ESM202Lecture7_2008 - Terrestrial Carbon Cycle 1...

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