Download or read book Geographic Variation in Slash Pine Pinus Elliottii Engelm written by and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geographic Variation in Slash Pine Pinus Elliottii Engelm written by Anthony E Squillace and published by Legare Street Press. This book was released on 2023-07-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive study of geographic variations in the species of slash pine known as Pinus Elliottii Engelm. It explores the reasons behind this variability and the implications for forestry management. The book includes an in-depth analysis of the ecological and environmental factors that influence the distribution and growth of this species, as well as the various forestry practices that can be used to promote its sustainable growth. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Geographic Variation in Slash Pine Pinus Elliottii Engelm written by A. E. Squillace and published by . This book was released on 1964 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: When a plant species occurs over a wide geographic range, individuals or populations growing in different localities frequently display differences in one or more traits. This phenotypic variation associated with locality (geographic variation) may he due to environmental or genetic factors, or interactions between them. Environmental differences are a consequence of modifications caused by habitat factors. Genetic variation associated with locality (racial variation), on the other hand, is due to such mechanisms as mutation, natural selection, hybridization, or combinations of these factors. It basically results from the fact that the individuals within populations differ genetically. The genetic heterogeneity between individuals is caused by mutation or hybridization. It is maintained by Intricate mechanisms inherent in most species, enhancing chances of survival of the species in a constantly changing environment. This genetic variation among individuals is the basis for racial variation. If the localities are characterized by different environments, and if some degree of reproductive isolation is present, racial variation will occur. Plants that are genetically most suited to their particular habitat will survive and reproduce In greater numbers than those not so well endowed. Some degree of reproductive isolation is necessary because If interbreeding occurs randomly throughout a species range, natural selection in a given locality would merely result in a change in the mean of the whole species. In forest trees, sufficient isolation is provided by the limited distance of pollen and seed dispersal. Although natural selection Is the most Important cause of racial variation, it is believed that such variation nay also result from chance fluctuations in gene frequencies (genetic drift) leading to fixation of genes. Genetic drift is most apt to occur in small, isolated populations and environmental differences need not he present. Geographic variation occurs in characteristic patterns, depending upon the nature of the forces that caused it. Since climatic factors are often important natural selection forces, and since climate often changes gradually over a species range, the pattern of racial variation frequently is continuous or clinal. However, relatively uniform and discontinuous habitats may cause relatively discrete populations or ecotypes. Likewise, present or past Isolation may cause ecotypes or combinations of both clinal and ecotypic variation. Needless to say, geographic variation In forest trees is common, and it is of great interest to forest land managers and forest scientists. The nature of geographic variation (i.e., the proportion of environmental and genetic components) is important to land managers because if differences in economically important traits are genetic they must use care in selecting sources of seed for forest planting. Likewise, forest geneticists are keenly aware of the possibilities of capitalizing on racial variation in development of superior strains. Taxonomists are interested in patterns of variation in their attempts to classify trees on both the species and subspecies level. The present study was designed mainly to Investigate the nature and patterns of geographic and racial variation for a number of characteristics in slash pine (Pinus elliottii Engelm.), one of the more important commercial trees of the Southeast. Secondary objectives were (l) to search for causes of patterns of variation that sight he found, and (2) to compare the magnitude of variation associated with localities against that associated with individuals within localities.

Download or read book Geographic Variation in Slash Pine written by A. E. Squillace and published by . This book was released on 1966 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetics of slash pine written by Keith W. Dorman and published by . This book was released on 1973 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shortleaf Pine Restoration and Ecology in the Ozarks written by John M. Kabrick and published by . This book was released on 2007 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Forest Service Research Paper NC written by North Central Forest Experiment Station (Saint Paul, Minn.). and published by . This book was released on 1966 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geographic patterns of fusiform rust infection in loblolly and slash pine plantations written by A. E. Squillace and published by . This book was released on 1976 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by and published by . This book was released on 1973 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geographic Variation in Survival Growth and Fusiform rust Infection of Planted Loblolly Pine written by Osborn O. Wells and published by . This book was released on 1966 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book USDA Forest Service Research Paper SE written by Southeastern Forest Experiment Station (Asheville, N.C.) and published by . This book was released on 1968 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book General Technical Report SRS written by and published by . This book was released on 1995 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Seed Source and Fertilization on Slash Pine Seedling Growth and Development written by Robert Paul Schultz and published by . This book was released on 1969 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pinus elliottii Engelm. var. seedlings were selected from 10 seed sources in the eastern and central portions of the natural range of the species. They were grown for 2 years in potted flatwoods soil under six fertilization treatments: two levels of phosphorus (P), all essential nutrients (E) except P, two levels of E plus P, and unfertilized controls. The seedlings differed in growth and nutrient absorption. Trees from coastal seed sources grew slower, especially when unfertilized or fertilized with E or E+P, and accumulated the least amount of nutrients when unfertilized. As long as other nutrients were not limiting, seedlings from middle coastal plain sources grew more rapidly than those from flatwoods sources under conditions of low available P. Large growth increases resulted from fertilization. Phosphorus alone had no effect on tree growth, but the E fertilization treatment significantly increased tree growth. the combined fertilizers, E+P, resulted in greatest growth and nutrient absorption. Phosphorus fertilization resulted in significant decreases in N and K contents, both in foliage and in total seedling.

Download or read book Agriculture Handbook written by and published by . This book was released on 1997 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Set includes revised editions of some issues.

Download or read book Tropical Yams and Their Potential written by Frank G. Hawksworth and published by . This book was released on 1976 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forest Regeneration Manual written by Mary L. Duryea and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Forest Regeneration Manual presents state-of-the-art information about current regeneration practices for southern pines in the United States. Over 1.2 billion seedlings of five major species -- loblolly, slash, longleaf, sand, and shortleaf -- are planted each year. In 22 chapters, the Manual details fundamental steps in establishing successful young pine plantations: regeneration planning, including economic and legal aspects; regeneration harvest methods; propagation by seed and vegetative techniques; bareroot and container seedling culturing in the nursery; measures of seedling quality; site potential; -- environment, associated vegetation, soils; matching species to sites; site preparation -- mechanical and chemical methods, fire, fertilization; seedling handling before planting; planting practices and measures of regeneration success; promoting early plantation growth and management of competing vegetation, insects, disease, and wildlife.

Download or read book Population Genetics of Forest Trees written by W.T. Adams and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tropical climates, which occur between 23°30'N and S latitude (Jacob 1988), encompass a wide variety of plant communities (Hartshorn 1983, 1988), many of which are diverse in their woody floras. Within this geographic region, temperature and the amount and seasonality of rainfall define habitat types (UNESCO 1978). The F AO has estimated that there 1 are about 19 million km of potentially forested area in the global tropics, of which 58% were estimated to still be in closed forest in the mid-1970s (Sommers 1976; UNESCO 1978). Of this potentially forested region, 42% is categorized as dry forest lifezone, 33% is tropical moist forest, and 25% is wet or rain forest (Lugo 1988). The species diversity of these tropical habitats is very high. Raven (1976, in Mooney 1988) estimated that 65% of the 250,000 or more plant species of the earth are found in tropical regions. Of this floristic assemblage, a large fraction are woody species. In the well-collected tropical moist forest of Barro Colorado Island, Panama, 39. 7% (481 of 1212 species) of the native phanerogams are woody, arborescent species (Croat 1978). Another 21. 9% are woody vines and lianas. Southeast Asian Dipterocarp forests may contain 120-200 species of trees per hectare (Whitmore 1984), and recent surveys in upper Amazonia re corded from 89 to 283 woody species ~ 10 cm dbh per hectare (Gentry 1988). Tropical communities thus represent a global woody flora of significant scope.