Lec 17 Bild 3 2011

Lec 17 Bild 3 2011 - Reminders: -Field trip extra credit is...

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Reminders: -Field trip extra credit is DUE by December 1 (the last lecture day) -CAPE open from Monday, 11/21 to 12/5 -Please pay attention for the email that will come with your personalized link to this class and please evaluate this class. Thank you!!! -CAPE scores: influence who will teach this class help me improve my teaching FINAL: is cumulative, study lecture material
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BILD 3 Lecture 17 - Ecosystem Ecology II I. Overview of nutrient cycling II. Water cycle III. Carbon cycle IV. Nitrogen cycle V. Phosphorous cycle
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How do nutrients flow through landscapes? How do organisms accumulate, transform, and redistribute nutrients among the various ecosystem compartments? What are the major pools and transition processes for water, nitrogen, phosphorous and carbon? How are nutrient cycles altered by human activity?
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Reservoir A Organic materials available as nutrients Living organisms, detritus Reservoir B Organic materials unavailable as nutrients Reservoir D Inorganic materials unavailable as nutrients Reservoir C Inorganic materials available as nutrients Fossilization Burning of fossil fuels Assimilation, photosynthesis Weathering, erosion Formation of sedimentary rock Respiration, decomposition, excretion Peat Coal Oil Minerals in rocks Soil Atmosphere Water
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How do nutrients flow through landscapes? Comparisons of rainfall (inputs) and stream water (outputs) can provide detailed information about nutrient cycling inputs > outputs: nutrients accumulate in the ecosystem outputs > inputs: nutrients are leaving the ecosystem What proportions of nutrients in an ecosystem are tied up in biomass and dead organic matter?
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Rain gauges provide data on nutrient inputs. Hubbard Brook Experimental Forest Example
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(a) Concrete dam and weir (b) Clear-cut watershed Stream gauges provide data on nutrient and water outputs Hubbard Brook Experimental Forest Example
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Completion of tree cutting Deforested Control Nitrate concentration in runoff (mg/L) 80 60 40 20 4 3
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Lec 17 Bild 3 2011 - Reminders: -Field trip extra credit is...

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