Effects of Organic Retention and Management on Nitrogen Flux in a Coarse Outwash Soil at Matlock, WA. A.B. Adams and Rob Harrison University of Washington in association with Pacific Northwest Research Station (Tim Harrington) and Green Diamond Resource Company (Randal Greggs)
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Effects of Organic Retention and Management on Nitrogen Flux in a Coarse Outwash Soil at Matlock, WA. A.B. Adams and Rob Harrison University of Washington.
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Effects of Organic Retention and Management on Nitrogen Flux in a
Coarse Outwash Soil at Matlock, WA.
A.B. Adams and Rob HarrisonUniversity of Washington
in association with
Pacific Northwest Research Station (Tim Harrington) and
Green Diamond Resource Company (Randal Greggs)
INTRODUCTION
• ONE OF 3 SITES – ALL TREATED AS INDEPENDENT STUDIES
• 3 LEVELS OF WOODY DEBRIS MANIPULATION WITH OR WITHOUT COMPETING VEGETATION CONTROL
• 3 x 2 FACTORIAL• TREATMENTS APPLIED TO 0.3-ha
PLOTS (10 x 30 m)
A FENCE WAS BUILT AROUND THE STUDY AREA
WEATHER DATA IS COLLECTED ON-SITE BY THE USDA PNW FOREST SERVICE LAB
MANAGEMENT TREATMENTS
• SECOND GROWTH DOUG-FIR FOREST (F)
• STEM ONLY–NO VEGETATION CONTROL (BO-NVC)
• STEM ONLY–VEGETATION CONTROL (BO-VC)
• WHOLE-TREE–NO VEGETATION CONTROL (WT-NVC)
• WHOLE-TREE – VEGETATION CONTROL (WT-VC)
ADJACENT SECOND GROWTH FOREST WASLEFT STANDING AND SERVED AS A CONTROLUse arrow to show forest
BOLES ONLY WERE REMOVED ANDNO VEGETATION CONTROL WAS APPLIED
BOLES ONLY WERE REMOVED AND VEGETATION CONTROL WAS APPLIED
WHOLE TREES WERE REMOVED AND THERE WAS
NO VEGETATION CONTROL
WHOLE TREES WERE REMOVED (DISTANT PLOT) AND VEGETATION CONTROL WAS APPLIED
Will cut out minipiles to show only Whole Tree-Veg Control(upper picture
Will label horizons and cut to use left side of photo and soil properties
TWO LYSIMETERS (20 cm AND 100 cm) TENSION LYSIMETERS WERE INSTALLED AT EACH PLOT TO MEASURE NITROGEN
AND CARBON FLUXWill add lab graphic here that includes subterranean pictorial of
lysimeters
BASIS FOR LYSIMETER DEPTHS
• 20 cm is depth at which plants adsorb nutrients
• 100 cm is depth at which solutes are considered leached from system
NO3-N CONCENTRATIONS AT 20 cm
NO3-N CONCENTRATIONS AT 100 cm
EVAPOTRANSPIRATION MODEL IS USED TO CALCULATE FLUX
COMPARATIVE CONCENTRATIONS OFNH3, NO3 AND DON SHOWN ON ONE SLIDE.This is a priority
• IF TIME PERMITS DO DISSOLVED ORGANIC CARBON FLUX
• Not a priority
SUMMARY
1) STUDY ALLOWS FOR CALCULATION THE VARIOUS LEVELS OF NUTRIENTS AND THEIR STABILITY IN DIFFERENT ECOSYSTEM COMPARTMENTS
2) RESULTS WILL ALLOW MANAGERS TO CONSIDER THE EFFECT OF DIFFERENT LEVELS OF LOGGING ON NUTRIENT POOLS AND PRODUCTIVITY
3) RESULTS CAN BE COMPARED WITH FALL RIVER AND MOLALLA
Slides not used follow
A HOBO TEMPERATURE SENSOR WAS INSTALLEDAT EACH PLOT AT A HEIGHT OF 25 CM