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lecture_10_SAC_H2O&Ncycles

lecture_10_SAC_H2O&Ncycles - W ater Cycle N utr...

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Water Cycle & Water Cycle & Nutrient Cycling Part 1 Nutrient Cycling Part 1 SAC 2/4/2010 The Water Cycle Overview on Nutrient Cycling Nutrient limitation to NPP The Nitrogen Cycle
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Clarifications from last class:
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Fluxes and pools Fluxes and pools POOL (liters) FLUX- I NPUT (liters/minu te) TURNOVER TIME: POOL FLUX FLUX- OUTPUT (liters/minu te)
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The Water Cycle The Water Cycle Units= TT 1TT= 1x10 18 g
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Questions Questions : 1. Which is the largest pool of water in the biosphere? 2. How do the precipitation/evaporation ratios differ between land and oceans? 3. Does the water vapor in the atmosphere move from land to the ocean or from ocean to the land? Why? 4. Which is the major source of potable water here in Florida?
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The Water Cycle The Water Cycle The processes of evaporation, transpiration, and precipitation cycle water through ecosystems
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The Water Cycle The Water Cycle 97% of the water in the globe resides in the oceans
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The Water Cycle The Water Cycle 22% of precipitation occurs over land, and is greater than losses by evaporation and transpiration 78% of precipitation occurs over ocean, which is less than losses by evaporation
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The residence time of water in the atmosphere is 2 weeks The oceans and land surface contain approximately 1,400,000 TT of water The atmosphere contains 13 TT of water vapor, and each year there is approximately 496 TT of precipitation globally. The residence time of water in liquid form on the surface is 2,800 years, 100,000 longer than in the atmosphere. The Water Cycle The Water Cycle
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Nutrient Cycles
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Nutrient A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment Nutrient Cycling The exchange of “mineral elements” among plants, animals, microbes and the abiotic environment (soil, water, atmosphere ) From the plant’s perspective, belowground resources control GPP, NPP, and decomposition From the animal’s perspective, nutrients sometimes limit function, growth and reproduction
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Global NPP Global NPP http://www.uni- klu.ac.at/socec/bilder/NPP0_600.png Which factors determine NPP??
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