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- W13625892 abstract "SUMMARY Species mixtures, although promising for improving the growth of spruce on nitrogendeficient sites, carry a risk of competition from the admixed nurse species. The mixture of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) planted at Gisburn Forest in 1955, in which nutritional benefits have been observed, provided a unique opportunity to study competition between these species. Pure plots of both species as well as the mixture were replicated in three blocks, allowing the effects of interplanting on the survival and mean diameter of each species to be tested statistically. Further, the grouped arrangement of the species in mixed plots presented a variety of competitive configurations between the two species. Instead of demonstrating the nursing benefit of pine to spruce, comparisons of mean diameters in pure and mixed stands indicated that spruce suffered and pine benefited from their interplanting at this site. Frequency distributions of tree diameters confirmed that spruce tended to be suppressed in mixture and pine dominant. Neighbour analysis revealed that spruce were significantly smaller when adjacent to pine and that this effect was mainly due to the larger size of pines. The increased height of spruce at this site, previously attributed to a nutritional benefit conferred by pine, was probably due to competition for light from an overtopping nurse. Nurse varieties must be carefully selected if they are to promote rather than suppress the growth of crop trees. INTRODUCflON On many poor heathland and deep peat sites, the admixture of 'nurse' species in forest plantations greatly improves the growth of spruce, the commercially desirable crop. Lodgepole pine (Pinus contorta Dougl.), Scots pine (Pinus sylvestris L.), and Japanese larch (Larix leptolepis (Sieb. & Zucc.) Gordon) have all been successful nurses for Sitka spruce (Picea sitchensis (Bong.)" @default.
- W13625892 created "2016-06-24" @default.
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- W13625892 date "1992-01-01" @default.
- W13625892 modified "2023-09-27" @default.
- W13625892 title "Competitive Interactions between Norway Spruce and Scots Pine at Gisbum Forest, NW" @default.
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