UCSB EEMB 171 - Lecture 9-11 2015 (1) (120 pages)

Previewing pages 1, 2, 3, 4, 5, 6, 7, 8, 56, 57, 58, 59, 60, 61, 62, 63, 113, 114, 115, 116, 117, 118, 119, 120 of 120 page document View the full content.
View Full Document

Lecture 9-11 2015 (1)



Previewing pages 1, 2, 3, 4, 5, 6, 7, 8, 56, 57, 58, 59, 60, 61, 62, 63, 113, 114, 115, 116, 117, 118, 119, 120 of actual document.

View the full content.
View Full Document
View Full Document

Lecture 9-11 2015 (1)

91 views


Pages:
120
School:
University of California, Santa Barbara
Course:
Eemb 171 - ECOSYSTEM PROCESSES

Unformatted text preview:

what regulates C gain or loss across scales How do we account for these effects Are there integrating variables that scale up canopy processes increase range of light intensities over which light use efficiency LUE is constant leaf nitrogen N controls photosynthetic capacity what regulates C gain or loss across scales these variables are all correlated with each other net photosynthesis leaf N specific leaf area leaf lifespan Why photosynthesis a chemical overview net photosynthesis balance between Cfixed respired leaf N concentration N is necessary for making chlorophyll specific leaf area surface area mass leaf lifespan fast or slow turnover what are the biological tradeoffs high N high photosynthesis capacity big surface area mass quick turnover low N low photosynthesis capacity small surface area mass slow turnover image source http www wallpapers247 com wallpaper Big Green Leaf http www pitzer edu offices arboretum scott lawn sage asp leaf lifespan months net photosynthesis nmol g1 sec 1 leaf lifespan months leaf N mg g 1 specific leaf area cm 2 g 1 leaf N mg g 1 leaf N mg g 1 specific leaf area cm 2 g 1 what regulates C gain or loss across scales NPP is about half of GPP what regulates C gain or loss across scales GPP ecosystem respiration both positively correlated with greenness NDVI these relationships make ecosystem C cycling modeling possible source Vourlitis et al 2003 Spatial variation in regional CO 2 exchange for the Kuparuk River Basin Alaska over the summer growing season large spatial scale modeling of GPP leaf area index leaf area per unit ground area can be measured by satellite remote sensing to produce NDVI greenness index live green plants appear relatively dark in the PAR relatively bright in the near infrared N content physiological activity how much chlorophyll large spatial scale modeling of GPP Maximum NDVI bimonthly average Air temperature average daily Solar radiation average daily measured NDVI for the Kuparuk watershed northern Alaska 1994 1995 source Vourlitis et al 2003 Spatial variation in regional CO 2 exchange for the Kuparuk River Basin Alaska over the summer growing season modeled ecosystem respiration for the Kuparuk watershed northern Alaska 1994 1995 high rate is 5 g C m 2 d 1 source Vourlitis et al 2003 Spatial variation in regional CO 2 exchange for the Kuparuk River Basin Alaska over the summer growing season modeled GPP for the Kuparuk watershed northern Alaska 1994 1995 high rate is 4 g C m 2 d 1 source Vourlitis et al 2003 Spatial variation in regional CO 2 exchange for the Kuparuk River Basin Alaska over the summer growing season modeled NEE for the Kuparuk watershed northern Alaska 1994 1995 high rate is 2 g C m 2 d 1 source Vourlitis et al 2003 Spatial variation in regional CO 2 exchange for the Kuparuk River Basin Alaska over the summer growing season caveats To model NPP and NEE you must model plant respiration Not trivial respiration results from multiple processes with different



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Lecture 9-11 2015 (1) and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Lecture 9-11 2015 (1) and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?