Growth and allocation of Douglas-fir seedlings in response to CO[sub 2], temperature, and nitrogen

Conference · Wed Jun 01 00:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7272088

Gillham, M L; Perry, D A; Grulke, N E; Winner, W E ^[1]

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1. Oregon State Univ., Corvallis, OR (United States)

Douglas-fir seedlings were grown, from cold-stratified seed, for 32 weeks in controlled-environment chambers. This factorial experiment had two levels each of atmospheric CO[sub 2] (350 an 700 ppm), soil temperature (13 and 17[degrees]C), and soil nitrogen (soils from 1200-m-elevation in the western Cascade Mountains of Oregon contained roughly two times as much carbon and nitrogen than soils from 900-m-elevation). Each whole plot (chamber) treatment (CO[sub 2] [times] temperature) was replicated three times. Photosynthetic photon flux density and soil temperature (at 15-cm-depth) were determined for each seedling/pot, and were analyzed as covariates. Doubled atmospheric CO[sub 2] resulted in greater biomass of seedlings grown in higher N-content soils, and +4[degrees]C soil temperature increased biomass of seedlings grown in both soils, at both levels of CO[sub 2]. Root-to-shoot ratios were greatest for seedlings grown in lower N-content soils for all treatments except +CO[sub 2] [times] +T, where they were equal. Doubled CO[sub 2] increased c-allocation belowground for trees grown in both soil types and at both temperatures. Corresponding data include seedling height and basal caliper, mass of structural compartments, and C, N, and total nonstructural carbohydrate contents of biomass compartments.

• OSTI ID: 7272088
• Report Number(s): CONF-940894-; CODEN: BECLAG
• Journal Information: Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; ISSN 0012-9623
• Country of Publication: United States
• Language: English

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