1. Aber J D and Mellilo J M 1982 Nitrogen immobilization in decaying hardwood leaf litter as a function of initial nitrogen and lignin content. Can. J. For. Res. 60, 2263–2269.
2. Alway F J and Zon R 1930 Quantity and nutrient contents of pine leaf litter. J. Forestry 28, 715–727.
3. Attiwill P M 1968 The loss of elements from decomposing litter. Ecol. 49, 142–145.
4. Berg B and Staaf H 1981 Leaching, accumulation and release of nitrogen in decomposing forest litter.In Terrestrial Nitrogen Cycles. Eds. F E Clark and T Rosswall. Ecol. Bull. (Stockholm) 33, 163–178.
5. Bockheim J G, Lee S W and Leide J E 1983 Distribution and cycling of elements in aPinus resinosa plantation ecosystem, Wisconsin. Can. J. For. Res. 13, 609–619.