Lecture Nov 1st

Lecture Nov 1st - 01/11/2010 Impact of humans on ecosystems...

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01/11/2010 1 Impact of humans on ecosystems II Climate change impacts on species and ecosystems The Earth has experienced global warming during the last century IPCC 2001 Physiology rowth Climate change Phenology Growth (productivity) Biotic interactions Distributions (species Disturbance Effect Effect of of CO CO 2 on on photosynthesis photosynthesis Higher CO 2 More C fixed More growth
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01/11/2010 2 Free-Air Carbon Dioxide Enrichment (FACE) Aspen FACE Experiment (Harshaw Experimental Forest near Rhinelander, Wisconsin) http://aspenface.mtu.edu/ Percy et al. 2002. Nature. 420: 403-407 Down Regulation: Higher CO 2 Lower stomatal conductance for same amount of C fixed Less transpiration (reduced loss of water) Effect Effect of of temperature temperature on on C fixation fixation Published by AAAS Fig. 2 Spatial pattern of terrestrial NPP linear trends from 2000 through 2009 (SOM text S1) (8, 10)
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01/11/2010 3 After a 6 percent increase in the 1980s and 1990s, plant productivity declined 1 percent in the last 10 years. “We see this as a bit of a surprise, and potentially significant on a policy level because previous interpretations suggested global warming might actually help plant
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Lecture Nov 1st - 01/11/2010 Impact of humans on ecosystems...

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