نتایج جستجو برای: spruces
تعداد نتایج: 81 فیلتر نتایج به سال:
Jonsson. B. 2001. Volume yield to mid-rotation in pure and mixed sown stands of Pirl~ls sylcestris and Pice& uhies in Sweden. Stztrliu Forestulir~ Suecicu 211. 19 pp. ISSN 0039-3150. ISBN 91-576-6137-5. Volume yield to mid-rotation in pure and mixed sown stands of Scots pine and Norway spruce was investigated in an experiment in central Sweden. The 43-year-old stands were situated on a 7-ha sit...
Studies over the past ten years have shown that the crown groups of most conifer genera are only about 15-25 Ma old. The genus Picea (spruces, Pinaceae), with around 35 species, appears to be no exception. In addition, molecular studies of co-existing spruce species have demonstrated frequent introgression. Perhaps not surprisingly therefore previous phylogenetic studies of species relationship...
Mixed-species forests in Fennoscandia are of increasing interest because they may improve resilience, biodiversity, and productivity. Currently there is scarce knowledge available the early growth dynamics mixed spruce–birch stands even-aged managed production with artificial regeneration spruce. The main objective our study was to examine present state past current single-storied, young (Picea...
Ecologists and foresters are becoming increasingly aware of the importance of spatial information in ecosystem analysis and resource management. An across-scale analysis of forest structure was conducted to characterize the spatial characteristics of a 2 ha spruce-®r forest located inside Changbaishan Natural Reserve (CNR), PR China. The study was designed to develop an approach for assessment ...
Reticulate species evolution, such as hybridization or introgression, is relatively common in nature. In the presence of reticulation, species relationships can be captured by a rooted phylogenetic network, and orthologous gene evolution can be modeled as bifurcating gene trees embedded in the species network. We present a Bayesian approach to jointly infer species networks and gene trees from ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید