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Nitrogen Retranslocation Response of Young Picea mariana to Nitrogen-15 Supply

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

View larger version (27K): [in a new window]   Fig. 1. Dry mass production in plant tissues of nutrient loaded (L) and conventional (C) black spruce seedlings sampled 0, 60, and 120 d after transplanting on nutrient poor (P), and rich (R) soils. Note scale for plant is three times that of other tissues.

View larger version (27K): [in a new window]   Fig. 2. Total N recovered in plant tissues of nutrient loaded (L) and conventional (C) black spruce seedlings sampled 0, 60, and 120 d after transplanting on nutrient poor (P), and rich (R) soils. Note scale for plant is twice that of other tissues.

View larger version (26K): [in a new window]   Fig. 3. Unlabeled N uptake and distribution in plant tissues of nutrient loaded (L) and conventional (C) black spruce seedlings sampled 0, 60, and 120 d after transplanting on nutrient poor (P), and rich (R) soils. Note scale for plant is twice that of other tissues.

View larger version (25K): [in a new window]   Fig. 4. Labeled N uptake and distribution in plant tissues of nutrient loaded (L) and conventional (C) black spruce seedlings sampled 0, 60, and 120 d after transplanting on nutrient poor (P), and rich (R) soils. Note scale for plant is twice that of other tissues.

View larger version (29K): [in a new window]   Fig. 5. Temporal dynamics of relative change in plant dry mass, N content, and concentration in old shoots of nutrient loaded (L, top) and conventional (C, bottom) black spruce seedlings after transplanting on nutrient 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.