[Enviro-lunch] Today (11/21): Craig See from University of Minnesota

[Yang Yang]

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Hello Everyone, please join us Today for this week's Enviro-Lunch talk by Craig See from University of Minnesota, at 11 am to noon in room SRE 475. Our new building, Sustainability Research & Engineering, is near the Yablokoff Wallace Dining Center.



Increases in forest productivity and litterfall N flux

are constrained by soil mineral phosphorus content



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Bio:
I am an ecosystem ecologist interested in how plants and their associated microbes affect the flow of carbon into and out of ecosystems. I am a Ph.D. candidate at University of Minnesota working with Peter Kennedy and Sarah Hobbie. My doctoral research focuses on the functional roles of mycorrhizal fungi in soil organic matter accumulation, but my previous work has focused primarily on aboveground processes. I'm a native Minnesotan, but much of my work has taken place in the Appalachian forests of New Hampshire and North Carolina. I am at the Lawrence Livermore National Laboratory right now for one year of Internship.

Work to be presented:

It is now clear that many terrestrial ecosystem processes are co-limited by nitrogen (N) and phosphorus (P). Theory predicts that the ability of forests to sequester anthropogenic C and N will depend in part the ability of soils to provide additional P to maintain plant demand. We tested this prediction using a 14-year record of tree growth, and a 20-year record of annual litterfall N flux in five forests at the Coweeta Hydrologic Laboratory, NC. We found that rates of increase in primary productivity and N cycling were proportional to increases in soil phosphorus (P) availability, which in turn was a function of the primary mineral P content of soils in these forests.  Foliar N:P stoichiometry from the beginning of the time series suggests that all of these forests were experiencing some degree of P limitation. Our results demonstrate that local variation in soil mineral composition will be an important mediator of terrestrial ecosystem response to global change.





When: Thursday 11/21, 11am - noon

Where: SRE 475



We look forward to seeing you,



Yang, Jennifer and Jing



Organizers for Fall 2019: Yang Yang and Jennifer Alvarez

Faculty coordinator: Asmeret Asefaw Berhe


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