Read e-book online Clonal Forestry II: Conservation and Application PDF

By W. J. Libby, M. R. Ahuja (auth.), Dr. Mulkh-Raj Ahuja, Dr. William J. Libby (eds.)

ISBN-10: 3642848133

ISBN-13: 9783642848131

ISBN-10: 364284815X

ISBN-13: 9783642848155

Provided listed below are either underlying conception and up to date effects in regards to the propagation and use of clones in study and in construction forestry. state of the art technology and case histories treating creation, checking out, multiplication and deployment of clones are offered. Agroforestry, city forestry and christmas-tree farming are coated, besides extra conventional multiple-use forestry and high-intensity forestry for biomass, wooden and fiber creation. Clonal forestry is contrasted to the newer advancements of "family forestry", and the classical tree-improvement technique counting on seed-orchards. The heritage of clonal forestry is roofed with stories of numerous centuries adventure with Sugi in Japan and poplars in Europe. The affects and use of clones within the contexts of genetic conservation and biodiversity are mentioned, as are the legislation and rules affecting clonal construction and deployment.

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The list of 941 cultivars by Santamour and McArdle (1982a, b, c, d, 1983a, b, c, 1984, 1985a, b, 1986), McArdle and Santamour (1984, 1987a, b) and Santamour et al. (1983) includes many of the species commonly planted as urban trees in the USA, but not all of them. For example, validated lists have not been published yet for Crataegus, Malus, Prunus, Ulmus, and Zelkova, which encompass a large number of urban-tree cultivars, nor have cultivars of conifer genera been so listed. It is noteworthy that many of the tabulated cultivars originated before 1900.

Understandably, there are as many kinds of demands for conservation of diversity in forests as there are diverse values of forest resources. Although some forest-conservation issues seem to apply specifically to the species, community, or ecosystem levels, genetic concerns in fact pervade all levels. The actual approach to forest-tree conservation and the methods used jointly depend on available genetic-conservation techniques and on the ultimate goal for perpetuating the germ plasm. 1 Threats to' Forest-Tree Germplasm Conservation usually is motivated by a threat to natural resources, either an immediate crisis or a perceived future challenge.

1). However, one of the important diseases of radiata pine Christmas trees is western gall rust, and resistance to this disease increases with increasing maturation state (Zagory and Libby 1985). Thus, families or populations that might support epidemics of this disease if deployed as seedlings might be managed at sub-epidemic levels if selected clones could be deployed. 3 De Present and the Future In about 1975, a single unusual tree appeared among about 1000 hybrid seedlings of Pinus attenuata x radiata being grown as Christmas trees in the central Sierra Nevada of California.

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Clonal Forestry II: Conservation and Application by W. J. Libby, M. R. Ahuja (auth.), Dr. Mulkh-Raj Ahuja, Dr. William J. Libby (eds.)

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