Abstract
We investigated the responses of needle litter of tamarack ( Larix laricina (Du Roi) K. Koch.) and black spruce ( Picea mariana (Mill.) B.S.P.) to fertilization of undrained and drained minerotrophic peatland sites. The drained site was ditched in the fall of 1987. Four N-P-K fertilization treatments (0-0-0, 0-80-120, 200-80-120, 400-80-120 kg ha −1), replicated three times on each site were applied at the end of May 1989. Needle litter was sampled on 17 September 1989 for black spruce and 30 September 1989 for tamarack. The needle litter P and K concentration and content of tamarack were increased by phosphorus/potassium fertilization, but were decreased by nitrogen fertilization. However, nitrogen fertilization increased needle N status of tamarack and black spruce, and unit needle mass of tamarack. Retranslocation of P and K was decreased by phosphorus/potassium fertilization, but was increased by nitrogen fertilization. Retranslocation of N decreased with nitrogen fertilization.
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