Http://www.forestsoils.org/smc/

Nutrition Project Resources1) Christopher Licata graduated (almost)2) Brian Strahm added Fall, 20023) 3 new students Fall, 2003 supported from

CFR/Gessel/TA fellowships4) Weyerhaeuser adding postdoc for Fall River5) Two Journal articles, one book chapter

published; others prepared; presentations at professional meetings

6) External funding continued and increased

The role of logging residues in a coastal WashingtonDouglas-fir stand: nitrogen mineralization following

bole-only and total-tree harvesting

Christopher William Licata

A thesis submitted in partial fulfillment of therequirements for the degree of

Master of Science

University of Washington

2003

Program Authorized to Offer Degree: College of ForestResources

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0

5

10

15

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25

9/13/00-10/27/00 11/13/00-12/27/00 04/08/01-05/22/01 06/01/01-07/15/01

Field Trial Dates

Net

Nit

roge

n M

iner

aliz

ed

(kg

ha-1

45

days

-1)

Bole-only

Total-tree plus

Figure 4.6 Seasonal net nitrogen mineralization (kg N ha-1 45 days-1) in a coastal WashingtonDouglas-fir stand beginning one year after harvest in two levels of slash retention. Va lues are meansof 4 plots per treatment and time period (bars are 95% confidence intervals about the mean).

Bole-onlyPlot 13

Total-tree plusPlot 14

Fall River Long-term Site Productivity Study Side-by-side plots with/without vegetation control

Plot 22: BO weeded

Plot 23: BO non-weeded

Fall River LTSP StudyAge 3 Seedling Volume Index (cm^3) by

Treatment

0

500

1000

1500

2000

2500

Treatment

Vol

ume

Inde

x (c

m^3

)

Series1a a a a b b b b

c c c c d

Paper “in press” for Soil Science Society of America Journal

Quantifying deep-soil and Coarse-Soil Fractions: avoiding sampling bias in estimating carbon in Pacific Northwest forest soils.

R.B. Harrison*, A.B. Adams, C. Licata, B. Flaming, G.W. Wagoner, P. Carpenter and E.D. Vance.

ABSTRACTForest soils of the Pacific Northwest are often deep and/or coarse-textured, which does not always lend itself to easy, unbiased sampling. Five methods commonly used in the PNW were compared for estimates of whole-soil C, including 1) large pit (0.5 m2) excavation, 2) dug pit with 54-mm hammer-core bulk-density sampling, 3) 31-mm soil push sampler, and 4) clod method. Two important regional forest soil series were studied: a loamy sand outwash soil (Indianola series) and a very gravelly sandy loam glacial outwash soil (Everett series). Coarse (>2mm) fragments associated with the soil samples were also collected, processed and analyzed for soil C. Extending soil sampling deeper than 15 cm increased soil C estimates by as much as 120%. The pit excavation method, which is by far the most labor-intensive and time consuming, was considered the "standard" by which other methods were compared, as it didn't contain any obvious biases. Soil core methods overestimated the <2mm soil fraction by forcing samples to be taken between large rocks. Although this is a clear bias, it is often accepted as the “best available method” due to the extreme time requirement of pit excavation. The 31-cm or 54-cm soil core methods often didn't work at all due to the high rock content of the soils. Including C analysis of the >2mm soil fraction increased soil C estimates by 170% for the Everett series soil (due to C contained in the rocks) but

did not substantially increase the estimate in the Indianola series soil.

Predicting the biomass of a high productivity even-aged mixed Douglas-fir/western hemlock plantation in the coastal Pacific Northwest: Accounting for bias introduced from using generalized predictive equations.

R.B. Harrisona,*,C.W. Licataa, B.L. Flaminga, T.A. Terryb, R. Meadeb, I.A. Guerrinic, B.D. Strahma, D. Xuea, A.B. Adamsa, M.R. Lolleya, A. Sidella, G.L. Wagonera, T. Breida, , D. Briggs, E.C. Turnblom, P. Carpentera and E.A. Vanced.

Installation 134 Pack ForestSeedling Height Growth

1.000

1.500

2.000

2.500

3.000

3.500

4.000

4.500

5.000

5.500

6.000

1997 1998 1999 2000

GROWTH YEAR

Control

Fertilized

Height (feet)