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12 Cards in this Set
- Front
- Back
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Productivity refers to what and what does this thing consist of?
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Increase in biomass
Biomass consist of carbon |
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Primary productivity refers to what?
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Converison of solar energy into organic matter
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Biomass is related to Net Primary Productivity (NPP). How is NPP determined?
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Gross Primary Productivity (GPP, which is total carbon assimilation, minus carbon lost during respiration.
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What is the main factor limiting plant productivity?
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Respiration
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Respiration is needed to produce energy needed for growth processes that increase biomass. But what other negative thing can it do?
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Waste energy as in when mitochondrial alterative oxidase (AOX) that oxidizes carbon while releasing most of the energy it produces as heat.
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What can be done to make more carbon available for growth?
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Minimize maintanence respiration
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Productivity is affected by two factors. What are they and what are example of each?
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Genetic:
-C3 vs. C4 vs. CAM pathways -leaf age and morphology -leaf are index -leaf angle -leaf orientation Enviromental Factors -light -CO2 -Temp -Soil Water -Nutrients -Pathological conditions -pollutants |
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Carbon dioxide is relased in the dark because of?
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Respiration
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What is the light compensation point?
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The point at which carbon fixation equals carbonm release (as photon flux increases,net carbon dioxide assimilation increases until the light compensation point)
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Photosynthesis is limited by what and how does the compensation point relate to this?
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Rate of electron transport. Above the compensation point, the photosynthetic rate initially increases in proportion to the photon flux.
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Why do C4 plants never really reach saturation of photosynthesis as a function of light?
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They can continue to fix CO2 using PEP carboxylase at very CO2 levels.
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How can the C3 curve be shifted twoards the C4 curve?
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Increasing ambient CO2 concentration
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