Lecture Nov 3rd

Lecture Nov 3rd - 02/11/2010 Ecosystem interactions with...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
02/11/2010 1 Impact of humans on ecosystems III teractions & ENVR 200 Nov 2, 2010 Interactions & Feedbacks Ecosystem interactions with climate Chapin et al. 2008 Front. Ecol. Env.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
02/11/2010 2 Chapin et al. 2008 Front. Ecol. Env. 1. Warming Effects Natural process Mountain Pine Beetle BUT AMPLIFIED BY Anthropogenic Processes Fire suppression Climate Change • Beetles prefer mature lodgepole pine Pine Beetle & Anthropogenic Process because of fire suppression, we have lots of mature pine. In the past 30 years, 5-10 times less fire than occurred historically eetle larvae killed by low ( 0C) winter • Beetle larvae killed by low (-40C) winter cold snaps because of climate change, winters have been much warmer
Background image of page 2
02/11/2010 3 Feedbacks to Climate What happens to carbon when 80% of pine in B.C. is killed by pine beetle? Positive Feedback Releases CO2 Pine beetle infestation Kills Trees Climate Change Climate Warms No beetle: forests are carbon sink (store more than release) With beetle: rests are a forests are a source of CO2 Permafrost Thawing ein 2008 Nature Heimann and Reichst e
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

Lecture Nov 3rd - 02/11/2010 Ecosystem interactions with...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online