Impact of Forest Fertilization on Health of the Hood Canal Watershed Cindy Flint Advisor: Rob Harrison, UW April, 2007 Funded by: • Green Diamond Resource Company • Puget Sound Regional Synthesis Model (PRISM) (with support from the Stand Management Cooperative)
Impact of Forest Fertilization on Health of the Hood Canal Watershed Cindy Flint Advisor: Rob Harrison, UW April, 2007 Funded by: Green Diamond Resource.
Dec 19, 2015
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- Slide 1
- Impact of Forest Fertilization on Health of the Hood Canal Watershed Cindy Flint Advisor: Rob Harrison, UW April, 2007 Funded by: Green Diamond Resource Company Puget Sound Regional Synthesis Model (PRISM) (with support from the Stand Management Cooperative)
- Slide 2
- Objectives Does forest fertilization with urea result in N leaching out of rooting zone? Could this negatively impact Hood Canal.
- Slide 3
- Background Sill restricts flow in and out of the canal Historically had periods of low DO Anthropogenic N loading to canal is worsening this problem
- Slide 4
- Eutrophication in Hood Canal Additions of limiting nutrients Algal blooms Blooms die off Decomposition consumes 0 2 Low DO in water Fish kills
- Slide 5
- Potential Causes of N Loading Erosion? Fertilization? Forests Agriculture Lawns Septic systems?
- Slide 6
- Past Research NO 3 - -N peaks in streams 0.25 mg L -1 to 9.3 mg L -1 Peaks due to runoff and direct application Steep slopes 15 % N in streams Buffers 0.45 % N in streams NO 3 - -N additions lasted longer (up to 1 year) (Meehan et al., 1975; Malueg et al., 1972; Perrin et al., 1984; Hetherington, 1984; Cline, 1973; Bisson et al., 1992; McCall, 1970)
- Slide 7
- Purpose Does forest fertilization with urea result in N leaching out of rooting zone?
- Slide 8
- Methods 6 Sites Age: 20-40 yrs Site Index: 70-90
- Slide 9
- Soil map Shelton Soil series Glacial till
- Slide 10
- Slide 11
- Site Layout.2 acre Lysimeter nest Control Treatment Fertilized with 224 kg N ha -1 as urea, March 20th, 2006
- Slide 12
- Tension Lysimeters 20cm 100cm
- Slide 13
- Methods (cont.) Tipping buckets - rainfall Thornthwaite Method - evapotranspiration Nitrogen leaching (kg ha -1 )
- Slide 14
- Quantified: Overstory N pools (biomass equations and % N) Understory N pools (calculated biomass and % N) Soil N pools Methods (cont.)
- Slide 15
- Precipitation
- Slide 16
- Total N Concentration
- Slide 17
- NO 3 -N Concentration
- Slide 18
- NH 4 -N Concentration
- Slide 19
- DON Concentration
- Slide 20
- Leaching
- Slide 21
- Total N Leaching
- Slide 22
- NO 3 -N Leaching
- Slide 23
- NH 4 -N Leaching
- Slide 24
- DON Leaching
- Slide 25
- Total N Leaching year following fertilization 2 % of applied N
- Slide 26
- Overstory Soil N Pools 26 % of applied N
- Slide 27
- Understory Soil N Pools 0 % of applied N
- Slide 28
- O Horizon Soil N Pools 27 % of applied N 18 % of applied N
- Slide 29
- B Horizon Soil N Pools 0 % of applied N 300 % of applied N
- Slide 30
- Implications for Hood Canal 215 ha yr -1 fertilized * 4.2 kg N ha -1 yr -1 = 903 kg N yr -1 total N load (Green Diamond) Total surface water TN load (Avg. 05 &06) (Steinberg) = Total groundwater DIN load (Paulsen, 06) = 536,000 kg yr-1 138,000 kg yr-1 + 674,000 kg yr -1 Fertilizer leaching = 0.13% total terrestrial N load to Hood Canal (Leaching)
- Slide 31
- Take home message If urea is allowed to infiltrate the soil, minimal leaching should occur. (in N limited forests) How to promote infiltration: Buffers!!! (unfertilized, vegetated) No application on steep slopes No application to streams
- Slide 32
- Thank You! Randall Greggs, Green Diamond Resource Company Puget Sound Regional Synthesis Model (PRISM) Stand Management Cooperative Rob Harrison, Advisor, College of Forest Resources, UW Brian Strahm, College of Forest Resources, UW
- Slide 33
- Soil pH
- Slide 34
- N limitation evidence Overstory % N Soil C/N Ratios
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