Lecture_7_SE_review - Lecture 7: Primary Production II...

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Lecture 7: Primary Production II Sevielleta Long Term Ecological Research Station (LTER) Overview of Lecture 1. Photosynthesis and respiration 2. Primary production: GPP, NPP, R, NEP 3. Methods used to measure primary production 4. Factors that promote global variation in primary production Oxygen Bubbling From Seagrass Photosynthesis Energy + 6CO 2 + 6H 2 O * C 6 H 12 O 6 + 6O 2 * Respiration C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O + energy NPP = GPP - R GPP = NPP + R Building Biomass Fig. 6.3 GPP = NPP + R NPP Respiration Net Ecosystem Production NEP = GPP – (R plants + R heterotrophs ) Comments: Stream NEP Photo credit: Dr. N. Ostrom
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Standing crop Standing crop Amount grazed NPP 8 4 0 Feb Mar Apr May Biomass g/m 3 What other processes might influence standing crop? http://www.k-state.edu/konza/keep/konza.pdf Burning + grazing Konza Prairie, Long term Ecological Research Station (LTER) V. Measuring Primary Production A. Harvest
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Lecture_7_SE_review - Lecture 7: Primary Production II...

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