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The Contrasting Response to Soil Disturbance between Lodgepole Pine and Hybrid White Spruce in Subboreal Forests

^a British Columbia Ministry of Forests, BAG 6000, Smithers, BC, V0J 2N0 Canada
^b Univ. of Northern British Columbia, 3333 University Way, Prince George, BC, V2N 4Z9 Canada
^c British Columbia Ministry of Forests, 200-640 Borland St., Williams Lake, BC, V2G 4T1 Canada
^d British Columbia Ministry of Forests, 1011 4th Ave., Prince George, BC, V2L 3H9 Canada

View larger version (18K): [in a new window]   Fig. 1. Trends in mineralizable N concentrations between preharvest (Year 0), posttreatment (Year 1) and Years 5 and 10 for (a) mineral soil and (b) forest floors. (Selected plots only for SBSmc and SBSwk; SE as error bars). OM1–bole only removal; OM3-Whole-tree and forest floor removed; C0–no compaction; C1–light compaction; C2–heavy compaction.

View larger version (18K): [in a new window]   Fig. 2. Net NH4+ mineralized (kg ha–1) in 5-wk in situ incubation for mineral soils + forest floors across soil disturbance treatments at Year 12 (sites and species split-plots combined; SE as error bars).

View larger version (25K): [in a new window]   Fig. 3. Tree height and height increment of lodgepole pine and hybrid white spruce at Year 12 across soil disturbance treatments (both sites combined; SE as error bars).

View larger version (21K): [in a new window]   Fig. 4. (a) Foliar N concentrations of lodgepole pine and hybrid white spruce at Year 12 across soil disturbance treatments (both sites combined; SE as error bars), and (b) relationship between height increment and foliar N concentrations at Year 12 for lodgepole pine (pl) and hybrid white spruce (sx) for both sites (SBSmc, Subboreal Spruce Biogeoclimatic zone moist and cold; SBSwk, Subboreal Spruce Biogeoclimatic Zone wet and cool).