rewm 3500 rangeland plant ecophysiology november 30, 2009
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REWM 3500 Rangeland Plant Ecophysiology November 30, 2009 Human impact on the global nitrogen cycle – how will rangelands respond? Natural vs Anthropogenic Nitrogen Fixation Consequences of altered N biogeochemistry 1)Where is this nitrogen going? - PowerPoint PPT PresentationTRANSCRIPT
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REWM 3500Rangeland Plant EcophysiologyNovember 30, 2009
Human impact on the global nitrogen cycle – how will rangelands respond?
Natural vs Anthropogenic Nitrogen Fixation
Consequences of altered N biogeochemistry1) Where is this nitrogen going?2) Effects on plant populations and communities3) Effects on biodiversity4) Impacts on atmospheric chemistry and global warming
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Connectivity
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Anthropogenic production of reactive nitrogen
Natural background rate
From Galloway 2005
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Human impacts on the global N cycleAtmospheric deposition of reactive N
From Galloway 2005
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Sinks Canyon, Fremont County, WyomingAnnual inorganic nitrogen deposition 1984-2007
http://nadp.sws.uiuc.edu
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From Galloway 2005
Human impacts on the global N cycle
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Sources, feedbacks and impacts of enhanced N fixation
From Galloway 2005
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Atmospheric concentrations of nitrous oxide over the last 10,000 years and since 1750 (inset)
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Terms and concepts to know:
nitrogen fixationabiotically fixed N2
biologically fixed N2
anthropogenic N fixationHaber processmineralizationnitrificationdenitrificationnitrous oxide (N2O)