Brian Lutz PhD Candidate, Duke University Visiting Researcher, University of Oslo Investigating interactions between the major biogeochemical cycles through understanding ecosystem- scale organic matter dynamics
Brian Lutz PhD Candidate, Duke University Visiting Researcher, University of Oslo Investigating interactions between the major biogeochemical cycles through.
Dec 28, 2015
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Brian Lutz
PhD Candidate, Duke University
Visiting Researcher, University of Oslo
Investigating interactions between the major biogeochemical cycles
through understanding ecosystem-scale organic matter dynamics
Outline
Research Background and Justification Ch 1: Preliminary Test of Hypotheses
Synoptic Surveys of Stream Chemistry Ch 2: Ecosystem Scale Manipulations
Stream Nutrient Spiraling Ch 3: Geochemical Controls on DON Losses
Soil Sorption Assays Ch 4: DOM Characterization
Fluorescence and PARAFAC Modeling Eutropia Project
Human Domination of the Global N Cycle
Credits: Netherlands Environmental Assessment Agency, www.pbl.nl
Nitrogen Saturation: Environmental Consequences
Credits: Diaz and Rosenberg, Science, 2008
Nitrogen Saturation: Symptoms and Diagnosis
Credits: Aber, BioScience, 1998
What about organic nitrogen?
1%
99%
Inorganic NOrganic N
Credits: Bormann et al., Science, 1977
What about organic nitrogen?
1%
99%
Inorganic NOrganic N
Credits: Bormann et al., Science, 1977
Organic N turnover supports the majority of ecosystem production in most ecosystems
DON Losses from the landscape are important
Credits: Scott et al., Global BGC Cycles, 2007
Nitrogen Saturation: Symptoms and Diagnosis
Credits: Aber, BioScience, 1998
DON??
‘Breaks in the Cycle’: Increased organic N losses?
Anthropogenic N Additions
Saturated Plant Demand
INCREASED ORGANIC N LOSSES
- Neff et al., Frontiers in Ecology, 2003
DON Release Hypothesis: Schematic
DON Release Hypothesis: Predictions
DON
[DIN]
[DO
N]
Outline
Research Background and Justification Ch 1: Preliminary Test of Hypotheses
Synoptic Surveys of Stream Chemistry Ch 2: Ecosystem Scale Manipulations
Stream Nutrient Spiraling Ch 3: Geochemical Controls on DON Losses
Soil Sorption Assays Ch 4: DOM Characterization
Fluorescence and PARAFAC Modeling Eutropia Project
DON Release Hypothesis: Preliminary Test
DON Release Hypothesis: Preliminary Test
DON Release Hypothesis: Preliminary Test
DON Release Hypothesis: Preliminary Test
DON Release Hypothesis: Preliminary Test
DON Release Hypothesis: Preliminary Test
+C +N +CN +DI
Bioavailability Assays
Indirect Carbon Control Hypothesis
Outline
Research Background and Justification Ch 1: Preliminary Test of Hypotheses
Synoptic Surveys of Stream Chemistry Ch 2: Ecosystem Scale C/N Manipulations
Stream Nutrient Spiraling Ch 3: Geochemical Controls on DON Losses
Soil Sorption Assays Ch 4: DOM Characterization
Fluorescence and PARAFAC Modeling Eutropia Project
Ecosystem Scale Experimental ManipulationsNUTRIENT SPIRALING THEORY
Ecosystem Scale Experimental ManipulationsNUTRIENT SPIRALING THEORY
Pump Metering in
C/N
Ecosystem Scale Experimental Manipulations
Day 1: N Enrichment Day 2: C Enrichment
Outline
Research Background and Justification Ch 1: Preliminary Test of Hypotheses
Synoptic Surveys of Stream Chemistry Ch 2: Ecosystem Scale Manipulations
Stream Nutrient Spiraling Ch 3: Geochemical Controls on DON Losses
Soil Sorption Assays Ch 4: DOM Characterization
Fluorescence and PARAFAC Modeling Eutropia Project
The Importance of Geochemical Controls
Large differences in DOM stoichiometry with different parent geology
143.4
36.6
0
20
40
60
80
100
120
140
160
180
200
Dolomite Shale
Parent Mineralogy
DO
M C
:N
Batch incubation soil sorption assays
Removal of Fe/Al
Unprocessed Soil
Removal of Native Organic Matter
Artificial Leachates
Batch incubation soil sorption assays
Credits: Qualls, Forest Ecol. & Managmnt, 2001
Outline
Research Background and Justification Ch 1: Preliminary Test of Hypotheses
Synoptic Surveys of Stream Chemistry Ch 2: Ecosystem Scale Manipulations
Stream Nutrient Spiraling Ch 3: Geochemical Controls on DON Losses
Soil Sorption Assays Ch 4: DOM Characterization
Fluorescence and PARAFAC Modeling Eutropia Project
DOM Characterization: Fluorescence and PARAFAC
Outline
Research Background and Justification Ch 1: Preliminary Test of Hypotheses
Synoptic Surveys of Stream Chemistry Ch 2: Ecosystem Scale Manipulations
Stream Nutrient Spiraling Ch 3: Geochemical Controls on DON Losses
Soil Sorption Assays Ch 4: DOM Characterization
Fluorescence and PARAFAC Modeling Eutropia Project
What am I doing in Norway?
Working with Eutropia Project Flux of Organic N and P from catchment soils to stream Event (storm) export of OM from catchments End Member Mixing Models (EMMA)
X
Y
Z
Acknowledgments
Host: Rolf Vogt UiO Chemistry Department
Funding: Research Council of Norway National Science Foundation
Implications for Ecosystem N Losses
Credits: Schimel and Bennett, Ecology, 2004
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