1 UIUC UIUC ATMOS 397G ATMOS 397G Biogeochemical Cycles and Biogeochemical Cycles and Global Change Global Change Lecture 15: Biosphere and Lecture 15: Biosphere and Nutrients Nutrients Don Wuebbles Don Wuebbles Department of Atmospheric Sciences Department of Atmospheric Sciences University of Illinois, Urbana, IL University of Illinois, Urbana, IL March 18, 2003 March 18, 2003
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1 UIUC ATMOS 397G Biogeochemical Cycles and Global Change Lecture 15: Biosphere and Nutrients Don Wuebbles Department of Atmospheric Sciences University.
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ATMOS 397GATMOS 397GBiogeochemical Cycles and Global ChangeBiogeochemical Cycles and Global Change
Lecture 15: Biosphere and NutrientsLecture 15: Biosphere and Nutrients
Don WuebblesDon Wuebbles
Department of Atmospheric SciencesDepartment of Atmospheric Sciences
University of Illinois, Urbana, ILUniversity of Illinois, Urbana, IL
March 18, 2003March 18, 2003
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The Biosphere (AVHRR measurements)The Biosphere (AVHRR measurements)
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The Biosphere over Time
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Leafing Dates of Oak (1746–present) - This graph shows how the leafing dates of oaks in southeastern England have changed over the past 256 years.
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Terrestrial EcosystemsTerrestrial Ecosystems
C/N in leaf tissue 50 NPP globally ~ 60 x 1015 gC/yr 1.2 x 1015 gN
needed each year N and P are often limited supply of these
elements may control NPP Nutrients in greater quantities, e.g., Ca and S,
have NPP determine their rate of cycling in ecosystems and losses to streamwaters
The atmosphere is the major source of C, N, and S in terrestrial ecosystems
Rock weathering is the major source for most remaining biochemical elements, e.g., Ca, Mg, K, Fe, P
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detailed overlay of N deposition patterns with ecosystem types was key to predicting possible C storage. Where high N deposition occurs on forested systems, there is a potential for significant C storage because forest vegetation has large C:N ratios and long tissue lifetimes in wood. Thus, a map of modeled C uptake using spatially defined estimates of fossil fuel N deposition suggested potential carbon sink hotspots in the mid-latitude forests of the northern hemispere, while at the same time showed that high deposition regions over grassland or agricultural areas, such as the Great Plains, were not likely to produce much carbon storage