Lecture 18 - BIO220

Differences in light litter layer and temperature

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Unformatted text preview: cture – Different architecture alters light, litter layer, temperature, etc. – Differences in light, litter layer, and temperature affect diversity, abundance, and biomass of colonizing species 23 24 -Exotic species: grow better under the erect plants (+ biomass, + cover, + richness) 4 19/03/2013 -Illustrates how these processes can feed-back on themselves • Add N, P, K, Mg Rothamsted Research Station, U.K. • Either alone or in concert • ~ 90 plots of land • Can examine response of communities to: – Fertilizer, time, or both Experiments started in the 1850’s: effects of fertilizer on hay yields 25 http://www.rothamsted.ac.uk/Content.php?Section=Resources&Page=ClassicalExperiments -Optimal effects of fertilizer that give the most hay out of one field 26 -Adding P,K,Mg either alone or all together to different plots of land -Early approach to understand "what is going on" to things we want to h ar vest. It allows us to look at the response of fertilizers alone or in c ombination. How does fertilization influence species diversity? -More resources = fewer species -Species diversity has a (-) relationship with # of fertilizers Silvertown et al. 2006 J. Ecology 94: 801 814 •Different shades of green: •Boundaries of plots, different vegetation in each plot •No hand weeding necessary 27 -They have not DONE anything but fertilize them differently for 160-165 years -As a consequence, the differences are so much that you can pick out individual p lots based on shade of green and how they look b/c each plot supports a diff c ommunity of plants -Variation in colour can help us determine that fertilization is af...
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