1. 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)

2. 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)

6. A FENCE WAS BUILT AROUND THE STUDY AREA

7. WEATHER DATA IS COLLECTED ON-SITE BY THE USDA PNW FOREST SERVICE LAB

8. 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)

9. ADJACENT SECOND GROWTH FOREST WAS LEFT STANDING AND SERVED AS A CONTROL Use arrow to show forest

10. BOLES ONLY WERE REMOVED AND NO VEGETATION CONTROL WAS APPLIED

11. BOLES ONLY WERE REMOVED AND VEGETATION CONTROL WAS APPLIED

12. WHOLE TREES WERE REMOVED AND THERE WAS NO VEGETATION CONTROL

13. WHOLE TREES WERE REMOVED (DISTANT PLOT) AND VEGETATION CONTROL WAS APPLIED Will cut out minipiles to show only Whole Tree-Veg Control(upper picture

14. Will label horizons and cut to use left side of photo and soil properties

15. TWO LYSIMETERS (20 cm AND 100 cm) TENSION LYSIMETERS WERE INSTALLED AT EACH PLOT TO MEASURE NITROGEN AND CARBON FLUX Will add lab graphic here that includes subterranean pictorial of lysimeters

16. 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

17. NO3-N CONCENTRATIONS AT 20 cm

18. NO3-N CONCENTRATIONS AT 100 cm

19. EVAPOTRANSPIRATION MODEL IS USED TO CALCULATE FLUX

20. COMPARATIVE CONCENTRATIONS OF NH3, NO3 AND DON SHOWN ON ONE SLIDE. This is a priority

21. IF TIME PERMITS DO DISSOLVED ORGANIC CARBON FLUX Not a priority

22. 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

26. Slides not used follow

27. A HOBO TEMPERATURE SENSOR WAS INSTALLED AT EACH PLOT AT A HEIGHT OF 25 CM

28. A RAIN GUAGE IS COLLECTING DATA 24/7/52