نتایج جستجو برای: spruces

تعداد نتایج: 81  

Journal: :Psyche: A Journal of Entomology 1909

Journal: :Nature Biotechnology 1984

2006
BENGT JONSSON

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...

Journal: :Molecular phylogenetics and evolution 2013
Jared D Lockwood Jelena M Aleksić Jiabin Zou Jing Wang Jianquan Liu Susanne S Renner

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...

Journal: :Forests 2022

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...

1999
Jiquan Chen Gay A. Bradshaw

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 ...

2018
Chi Zhang Huw A Ogilvie Alexei J Drummond Tanja Stadler

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 ...

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