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Nutrition Project Resources 1)Christopher Licata graduated (almost) 2)Brian Strahm added Fall, 2002 3)3 new students Fall,

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Presentation on theme: "Nutrition Project Resources 1)Christopher Licata graduated (almost) 2)Brian Strahm added Fall, 2002 3)3 new students Fall,"— Presentation transcript:

1 Http://www.forestsoils.org/smc/ Nutrition Project Resources 1)Christopher Licata graduated (almost) 2)Brian Strahm added Fall, 2002 3)3 new students Fall, 2003 supported from CFR/Gessel/TA fellowships 4)Weyerhaeuser adding postdoc for Fall River 5)Two Journal articles, one book chapter published; others prepared; presentations at professional meetings 6)External funding continued and increased

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6 Bole-only Plot 13 Total-tree plus Plot 14

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8 Fall River Long-term Site Productivity Study Side-by-side plots with/without vegetation control Plot 22: BO weeded Plot 23: BO non- weeded

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10 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. ABSTRACT Forest 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 m 2 ) 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 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.

11 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. Harrison a,*,C.W. Licata a, B.L. Flaming a, T.A. Terry b, R. Meade b, I.A. Guerrini c, B.D. Strahm a, D. Xue a, A.B. Adams a, M.R. Lolley a, A. Sidell a, G.L. Wagoner a, T. Breid a,, D. Briggs, E.C. Turnblom, P. Carpenter a and E.A. Vance d.

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