Lec 4b - BIS2B Fall 2008 Weds Sept 30 Lecture 4 Functional...

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BIS2B, Fall 2008 Weds Sept 30, Lecture 4. Functional Diversity, How it works
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Extra Office Hour. The only time that you can make any office hour. a. Monday 4PM b. Weds 4PM c. Tuesday 4 PM d. Tuesday 5 PM e. Tuesday 6 PM
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Ecology: principles and applications J. L. Chapman, M. J. Reiss 1999. Cambridge University Press. Biome standing crop biomass as a function of latitude and moisture Sadava 1187..biomass=mass of living matter, highly correlated with energy content of living matter.
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Another important proxy from MODIS is water vapor, which indicates EVAPOTRANSPIRATION, ET, which focuses on plant growth rate. ET can be highly correlated with plant growth because plant stomates have to open for exchange of CO 2 and O 2 with the atmosphere. When stomates open, the plant loses water to the atmosphere. Where vegetation is dense, most of the H 2 0 of evapotranspiration measured by MODIS is from the plants. So far, we know that latitude affects climate (heat, water, seasonality) which affects plant and animals species richness. Much of what we know about these relationships between geography and biodiversity comes from remote sensing. We have learned that MODIS detects the ratio of near infrared and visible light, which gives proxies for plant biomass that are highly correlated with numbers of tree species. Sadava p. 771
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Evapotranspiration = transpiration + evaporation. Sadava p. 771 http://en.wikipedia.org/wiki/Evapotranspiration http://extension.oregonstate.edu/mg/botany/images/tree1.html
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Evapotranspiration is a good proxy for Plant Primary Productivity Primary productivity = grams carbon fixed by vegetation/ unit area / unit time usually gC/m 2 /year GPP = gross primary productivity, NPP = net primary productivity. NPP = GPP – plant respiration.
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Evapotranspiration Plant Productivity Plant Species Diversity Currie & Paquin. 1987. Nature 329:326-9 Theory 1 & 2. Positive feedback produces increasing biodiversity with increasing plant productivity.
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http://en.wikipedia.org/wiki/Positive_feedback#In_biology
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