Lec17_2011BILD3

Lec17_2011BILD3 - BILD 3 Lecture 17 Ecosystem Ecology II I Overview of nutrient cycling II Water cycle III Carbon cycle IV Nitrogen cycle V

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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 compartments of an ecosystem? 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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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 living biomass and dead organic matter outputs > inputs: ecological disturbance, fire, weathering of bedrock, nitrogen fixation What proportions of nutrients in an ecosystem are tied up in biomass and dead organic matter? Hubbard Brook Experiment: remove vegetation from small watersheds
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Rain gauges provide data on nutrient inputs.
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Stream gauges provide data on nutrient outputs.
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Vegetation critical to the retention of water and nutrients . shift from nitrogen storage to massive nitrogen loss: uncut system gained 1-3 kg N ha -1 yr -1 clear-cut system lost 54 kg N ha -1 yr -1 NO 3 -
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II. Water cycle Solar powered. Key processes: evaporation, condensation, precipitation Evaporation over oceans exceeds precipitation; precipitation over land exceeds
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97% of the water in the biosphere resides in the oceans. Water in the atmosphere at any one time is a small amount of the earth’s water. Water is essential to all life; stimulates NPP and
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This note was uploaded on 01/25/2012 for the course BILD 3 taught by Professor Wills during the Spring '07 term at UCSD.

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Lec17_2011BILD3 - BILD 3 Lecture 17 Ecosystem Ecology II I Overview of nutrient cycling II Water cycle III Carbon cycle IV Nitrogen cycle V

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