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Nutrient Retranslocation Response of Picea mariana Seedlings to Nitrogen Supply

Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto, ON M5S 3B3, Canada

View larger version (36K): [in a new window]   Fig. 1. Nutritional interpretations of directional changes with time in dry mass, nutrient content, and nutrient concentration during plant development. The reference point (R) represents an initial plant sample taken at time T0 (usually normalized to 100). Vector orientation and magnitude characterize parameter relationships [increase (+), decrease (-), or unchanging (0)] relative to seedlings sampled at subsequent time intervals. Arrow direction also depicts time progression from time T0 to T1, T2... A new Shift G, characterizing net depletion often associated with retranslocation, is included in the box (Modified from Imo and Timmer, 1997; Malik, 1998)

View larger version (29K): [in a new window]   Fig. 2. Component dry mass production of nutrient-loaded (L) and conventional (C) black spruce seedlings 0, 60, and 120 d after transplanting on poor (P), medium (M), and rich (R) soils

View larger version (23K): [in a new window]   Fig. 3. Vector nomograms of absolute change in dry mass, N uptake, and concentration in old shoots of nutrient-loaded (L, top) and conventional (C, bottom) spruce seedlings after transplanting on poor (P) and rich (R) soils. Vectors reflect progressions in time (d) from T0 to T60, and T60 to T120. Note scale difference between nomograms

View larger version (31K): [in a new window]   Fig. 4. Estimated amounts of N, P, and K mobilized from old shoots (net retranslocation/10) and from the soil (uptake) for new growth in nutrient-loaded (L) and conventional (C) black spruce seedlings [left]; transplanted on poor (P), medium (M) and rich (R) soils [right]. Vertical bars are standard errors of mean. Similar bars marked with different letters are significantly different according to DMRT, P < 0.05

View larger version (17K): [in a new window]   Fig. 5. Estimated amounts of N, P, and K mobilized from old shoots (net retranslocation/10) and from the soil (uptake) for new growth in black spruce seedlings 60 and 120 d after transplanting. Vertical bars are standard errors of mean. Similar bars marked with different letters are significantly different according to DMRT, P < 0.05