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In nature, forest ecosystems are composed by mixtures of species located in the understorey, intermediate and overstorey
layers and a potential increase in productivity with mixed stands and plantations, compared to pure stands of the component
species is widely accepted, although this has not generally been incorporated into forestry practice. In this experimental
planting study, the types of mixtures tested includes three row mixtures with species changing in the planting line, two line
mixtures with species changing between the planting line and two monocultures. The species growth pattern was analysed
and productivity comparisons between mixed stands and pure stands of the component species were made using the relative
yield RY. and relative yield total RYT. concepts. The species shows different top height growth patterns which are not
influenced by the mixtures tested. Castanea satiÍa responds well to competitive pressure from Pseudotsuga menziesii which
shows a higher productivity. In the row mixtures, the positive effect of interspecific competition yields to RYT values
greater than 1.0. Mixture RYT values are steadily increasing with time and C. satiÍa monoculture has been the most
attractive economic solution, although its importance compared with the most productive mixtures is diminishing over time.
This species mixture represents a flexible silvicultural system, which will be in the future, a very important land use
alternative in mountain areas.
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Citação
Luís, Jaime F. Sales; Monteiro, Maria do Loreto (1998). Dynamics of a broadleaved Castanea sativa/conifer Pseudotsuga menziesii/mixed stands in Northern Portugal. Forest Ecology and Management. ISSN 03781-127. 107:1-3, p. 183-190