Environmental influences on post-harvest natural regeneration of <Emphasis Type="Italic">Pinus pinaster</Emphasis> Ait. in Mediterranean forest stands submitted to the seed-tree selection method |
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Authors: | Encarna Rodríguez-García Libertad Juez Felipe Bravo |
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Institution: | 1.Departamento de Producción Vegetal y Recursos Forestales, E.T.S. de Ingenierías Agrarias,Universidad de Valladolid,Palencia,Spain;2.Sustainable Forest Management Research Institute UVA-INIA,Palencia,Spain |
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Abstract: | Research on natural regeneration is crucial for the development of sustainable forestry practices, in light of the global
climate changes taking place. In this study, 151 plots were sampled in six Pinus pinaster stands that were naturally regenerated by the seed-tree method in Mediterranean forests in central Spain. The objectives
of the survey were to study the suitability of different forest stands designated for natural regeneration as well as to analyse
seedling establishment and the relationship between regeneration and different site factors. Analysis of variance and multivariate
analysis with canonical ordination techniques were employed. Full and partial redundancy analyses on a correlation matrix
were used to carry out a direct gradient analysis of regeneration density as a function of site factors. Nearly all stands
presented seedling densities over 2,000 seedlings ha?1 and were thus found to be suitable for natural regeneration of Pinus pinaster by the seed-tree selection method. Significant variables that best explained total seedling and viable seedling density were
spring and autumn precipitation of the year prior to establishment, spring and summer precipitation of the year of establishment
and percentage cover of litter. There were no signs of competition between shrubs and seedlings, but a negative significant
correlation with grass cover was observed. Pinus pinaster natural regeneration was successful with the seed-tree method, although it appeared to be highly dependent on climate and
stand conditions. |
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