Nutrient Rich "Hot Spots" Across the Sierran Front to the - - PowerPoint PPT Presentation
Nutrient Rich "Hot Spots" Across the Sierran Front to the Cascades CABNR TEAM: Carinna Robertson (Graduate Research Assistant, University of Nevada, Reno) Dr. Wally Miller, Dr. Dale Johnson, Dr. Roger Walker , Casandra Woodward and
CABNR TEAM:
Carinna Robertson (Graduate Research Assistant, University of Nevada, Reno)
Casandra Woodward and Brooke Eustis
trekaroo.com
Biogeochemical “hot spots” or “hot moments”
Transport of Nutrients (Nitrogen (N) and Phosphorus (P) Calcium (Ca2+), Magnesium (Mg2+), Potassium (K+)
Biologically available N and P traveling from the O horizon along preferential flow
paths (Miller et al., 2005)
Identified the periodic presence of nutrient rich “hot spots/moments” within the soil
matrix; albeit the spatio-temporal scale was uncertain (Johnson et al., 2011).
To develop a better understanding of water flow and nutrient
infiltration patterns across the Sierra Nevada Mountain Range.
Potential Cause of Excess Nutrients Management Strategies
Biogeochemical “Hot Spots”
Presence or absence Chemical composition Geographic distribution
Castle Lake, CA Sagehen, CA Truckee, CA Little Valley, NV Kings River, CA
Controlled Grid Plots 2-9m2 , 16 points
Resin Lysimeters Resin Capsules
2 Settings:
Upland Forested Ecotone Transition/Variable
Down-Gradient Ecotone
Lysimeter /Capsule Grid
3 meters 1 2 3 4 5 6 7 8 9 10 11 13 12 14 15 16 Uphill Capsule
Point Runoff Collector Runoff Collector
4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid Positions
Nutrient "Hot Spot" Detection at the TR Site 1st Yr. (umol/cm2)
Ca Mg Ortho-P NH4-N NO3-N
~ 9 m2 Most Nutrients Would Correlate at a Grid Point
4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid Positions
Nutrient "Hot Spot" Detection at TR Site 2nd Yr. (umol/cm2)
Ca Mg Ortho-P NH4-N NO3-N
~ 256 Grid Points only 4 Points Detected Similar High Nutrient Fluxes (1.5%)
4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid Positions
Nutrient "Hot Spot" Detection at the LVJP Site 1st Yr. (umol/cm2)
Ca Mg NH4-N NO3-N Ortho-P 4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid Positions
Nutrient" Hot Spot" Detection at the LVJP Site 2nd Yr. (umol/cm2)
Ca Mg Ortho-P NH4-N NO3-N
4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid Positions
Nutrient "Hot Spot" Detection at the SL Site 1st Yr. (umol/cm2)
Ca Mg Ortho-P NO3-N NH4-N 4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid positions
Nutrient "Hot Spot" Detection at the SL Site 2nd Yr. (umol/cm2)
Ca Mg Ortho-P NH4-N NO3-N
4 8 12 16 20 4 8 12 16 20 Vertical Grid Position Horizontal Grid Position
Nutrient "Hot Spot" Detection at CL Site 1st yr. (umol/cm2)
Ca NO3-N Mg NH4-N Ortho-P 4 8 12 16 20 4 8 12 16 20 Vertical Grid Positions Horizontal Grid Positions
Nutrient" Hot spot" Detection at CL Site 2nd Yr. (umol/cm2)
Ca Mg NO3-N NH4-N Ortho-P
0m 1m 2m 3m 0m 1m 2m 3m
NH4-N (umol/cm2) Fall Collection 2009
0m 1m 2m 3m 0m 1m 2m 3m
NH4-N (umol/cm2) Spring Collection 2010
Fall , NH4-N Spring, NH4-N (umol/cm2) (umol/cm2)
5 10 15 20 25 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
Sagehen Upland Site
1st Yr. NO3-N ug/cm2 2nd Yr. NO3-N ug/cm2
Sagehen Upland Site Moderate and Extreme Outlier
ug/cm2
. 1st Yr. 2nd Yr. umol/cm2
NO3-N NH4-N
. 1st Yr. 2nd Yr.
umol/cm2 umol/cm2
Ca2+ Mg2+ . 1st Yr. 2nd Yr. umol/cm2 umol/cm2
Biogeochemical “Hot Spots/Moments” are Variable
Spatial Variation Seasonal and Annual Variation
9 m2 all Nutrients will Possibly Correlate at a Single Grid Water Flow and Nutrient Infiltration Patterns were
Geographic Distribution
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