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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 300
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 300
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Author: Dale S. Solomon
Publisher:
ISBN:
Category : Trees
Languages : en
Pages : 16
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Book Description
Concerns over possible increases in global temperature have renewed interest in the detection, measurement, and analysis of tree-species migration. Previous work has consisted mostly of computer simulations of changes in species ranges. In this study, two complementary approaches were used to examine movements of tree species in New England, where there is a documented increase (at Hanover, New Hampshire) in mean annual and summer temperatures of about 2OC since 1835. We used advancing-front theory to examine age trends over distance and elevation in undisturbed stands on Haystack Mountain in New Hampshire. Then we examined changes in species occurrence over a 24-year period on USDA Forest Service survey plots throughout Maine. On Haystack Mountain, well-defined stationary fronts (no movement) were identified for red spruce (Picea rubens Sarg.) and beech (Fagus grandifolia Ehrh.); these occurred at the borders of distinct changes in site conditions, which serve as temporary obstacles to species' movements. A catastrophic front was depicted for sugar maple (Acer saccharum Marsh.): no established understory stems less than about 100 years old were evident at elevations above 720 m on a site complex composed of shallow bedrock interspersed with deeper till. A constant, very slowly moving advancing front was exhibited by hemlock (Tsuga canadensis (L.) Carr.). In Maine, white pine (Pinus strobus L.), and balsam fir (Abies balsamea (L.) (Mill.) decreased significantly in average latitude and elevation over the 24-year period; average species' elevations decreased by only 16 and 7 m, respectively, while latitudes decreased (southerly) by about 0.1 and 0.04 degrees (1 1.3 to 4.5 km). The other significant change was an increase (westerly) in longitude of sugar maple by about 0.1 degree (6.9 km). Succession--not climatic shifts-- following land use changes or cutting probably was responsible for these trends for sugar maple. Forest managers should be aware that natural succession as influenced by disturbance, land use, and site currently is the dominant influence affecting species changes in New England forests. At present, potential ranges of the major species in terms of elevation and regional position appear stable and in alignment with known site requirements.
Author: Jonathan D. Sauer
Publisher: Univ of California Press
ISBN: 0520068718
Category : Nature
Languages : en
Pages : 299
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Book Description
Using cases of plant migration documented by both historical and fossil evidence, Jonathan D. Sauer provides a landmark assessment of what is presently known, and not merely assumed, about the process.
Author:
Publisher:
ISBN:
Category : Bartlett Experimental Forest (N.H.)
Languages : en
Pages : 18
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Author:
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ISBN:
Category :
Languages : en
Pages : 566
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Book Description
Author: Alfred Traverse
Publisher: Springer Science & Business Media
ISBN: 1402056109
Category : Science
Languages : en
Pages : 816
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Book Description
This book provides complete coverage of all aspects of the study of all fossil palynomorphs yet studied. It is a profusely illustrated treatment. The book serves both as a student text and general reference work. Palynomorphs yield information about age, geological and biological environment, climate during deposition, and other significant factors about the enclosing rocks. Extant spores and pollen are treated first, preparing the student for more difficult work with fossil sporomorphs and other kinds of palynomorphs. An appendix describes laboratory methods. The glossary, bibliographies and index are useful tools for study of the literature.
Author: Michael Begon
Publisher: John Wiley & Sons
ISBN: 0470909137
Category : Science
Languages : en
Pages : 485
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Book Description
Essentials of Ecology, 4th Edition presents introductory ecology in an accessible, state-of-the-art format designed to cultivate the novice student's understanding of and fascination with the natural world. In a concise, engaging style, this text outlines the essential principles of ecology from the theoretical fundamentals to their practical applications. Full color artwork, simple pedagogical features and a wide range of carefully-chosen examples make this book an ideal introduction to ecology for students at all levels.
Author:
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ISBN:
Category : Biomass energy
Languages : en
Pages : 112
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Book Description
Author: Brian Huntley
Publisher: Springer Science & Business Media
ISBN: 3642605990
Category : Science
Languages : en
Pages : 520
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Book Description
Numerous experts including ecologists, geneticists, paleontologists and climatologists, investigate the response of terrestrial organisms to changes in their environment. The volume comprises an introductory and a final chapter by the editors as well as another 35 contributions. These are divided into six sections: 1. past environmental changes - the late-Quaternary; 2. spatial responses to past changes; 3. mechanisms enabling spatial responses; 4. evolutionary responses to past changes; 5. mechanisms enabling evolutionary responses; 6. predicted future environmental changes and simulated responses. The overwhelming and unanimous conclusion of all contributors is that forecasted global environmental changes pose a severe threat to the integrity of ecosystems worldwide and to the survival of at least some species.
Author: Daniel D. Sperduto
Publisher:
ISBN:
Category : History
Languages : en
Pages : 244
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Book Description
