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Ecogeographical Classification Of Arctic Vegetation
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Book Synopsis Ecogeographical Classification of Arctic Vegetation by : Tyge Wittrock Boecher
Download or read book Ecogeographical Classification of Arctic Vegetation written by Tyge Wittrock Boecher and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecogeographical Classification of Arctic Vegetation Based on Shoots Density Determinations by : Denmark. Kommissionen for videnskabelige undersøgelser i Grønland
Download or read book Ecogeographical Classification of Arctic Vegetation Based on Shoots Density Determinations written by Denmark. Kommissionen for videnskabelige undersøgelser i Grønland and published by . This book was released on 1919 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecogeographical classification of arctic vegetation by :
Download or read book Ecogeographical classification of arctic vegetation written by and published by . This book was released on 1977 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecogeographical Classification of Arctic Vegetation Based on Shoots Density Determinations by : Tyge W. Böcher
Download or read book Ecogeographical Classification of Arctic Vegetation Based on Shoots Density Determinations written by Tyge W. Böcher and published by . This book was released on 1977 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecogeographical Classification of Arctic Vegetation Based on Shoots Density Determinations by : Tyge Wittrock Böcher
Download or read book Ecogeographical Classification of Arctic Vegetation Based on Shoots Density Determinations written by Tyge Wittrock Böcher and published by . This book was released on 1977 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Alaska Vegetation Classification by : Leslie A. Viereck
Download or read book The Alaska Vegetation Classification written by Leslie A. Viereck and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vegetation of the Earth in Relation to Climate and the Eco-physiological Conditions by : Heinrich Walter
Download or read book Vegetation of the Earth in Relation to Climate and the Eco-physiological Conditions written by Heinrich Walter and published by . This book was released on 1973 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Descriptions of kinds of zonal vegetation into which eco-physiological data must fit. Includes chapters on the arctic tundra, boreal coniferous forest, and alpine vegetation zones.
Author :Canada Committee on Ecological Land Classification. National Vegetation Working Group Publisher : ISBN 13 : Total Pages :32 pages Book Rating :4.:/5 (319 download)
Book Synopsis The Canadian Vegetation Classification System by : Canada Committee on Ecological Land Classification. National Vegetation Working Group
Download or read book The Canadian Vegetation Classification System written by Canada Committee on Ecological Land Classification. National Vegetation Working Group and published by . This book was released on 1990 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A system is presented for classifying terrestrial vegetation in Canada. The system has seven levels defined by plant community physiognomy and species-dominance criteria; the composition of the upper four levels have been completed, whereas the remaining levels still require development"--Pref.
Book Synopsis Classification and Mapping of Arctic Vegetation by : Fred J. A. Daniels
Download or read book Classification and Mapping of Arctic Vegetation written by Fred J. A. Daniels and published by . This book was released on 2005 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Allotetraploid Saxifraga Nathorsti and its Probable Progenitors S. Aizoides and S. Oppositifolia by :
Download or read book The Allotetraploid Saxifraga Nathorsti and its Probable Progenitors S. Aizoides and S. Oppositifolia written by and published by Museum Tusculanum Press. This book was released on with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Subject Catalog by : Library of Congress
Download or read book Subject Catalog written by Library of Congress and published by . This book was released on with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Arctic and Antarctic by : Vera D. Aleksandrova
Download or read book The Arctic and Antarctic written by Vera D. Aleksandrova and published by Cambridge University Press. This book was released on 2009-06-25 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1977, this is an authoritative work by one of the world's leading ecologists. Aleksandrova's account is a very full one with much detail. The methods of classification are as interesting as the results. A wide variety of floristic, vegetational, structural, faunistic and ecological data, both qualitative and quantitative, are used to diagnose and characterise vegetation units. The vegetation of the Arctic and Antarctic is classified according to diagnostic and characteristic features. The Arctic is divided into two provinces, tundra and polar desert and the Antarctic into subantarctic herbaceous cushion vegetation and antarctic polar desert. The arctic tundra is further subdivided into subarctic with shrubby Betula (Birch) or true arctic tundra without Betula. The end result is an analysis of plant communities in the polar regions that enables ecologists to generalise and, perhaps more important, to limit correctly the scope of that generalisation when it is drawn from careful local studies.
Book Synopsis Physiological and Ecological Studies on an Arctic Vegetation by : R. Scott Russell
Download or read book Physiological and Ecological Studies on an Arctic Vegetation written by R. Scott Russell and published by . This book was released on 1940 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Arctic Plants of Svalbard by : Yoo Kyung Lee
Download or read book Arctic Plants of Svalbard written by Yoo Kyung Lee and published by Springer Nature. This book was released on 2020-02-07 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic is a special world. The Arctic Ocean is covered by white sea ice, and its margins are surrounded by bare terrestrial regions, known as tundra. Tundra is a cold and dry environment without trees, but even in the absence of trees, tundra plants such as dwarf shrubs, grasses, herbs and moss support the harsh environment by providing sustenance and shelter. This book introduces representative arctic plants and their function in Svalbard, revealing the unique tundra ecosystem, and discussing the direct and indirect effects of climate change in the Arctic.
Author :Centre national de la recherche scientifique (France) Publisher :Éditions du Centre national de la recherche scientifique ISBN 13 : Total Pages :594 pages Book Rating :4.:/5 (31 download)
Book Synopsis Arctica 1978 by : Centre national de la recherche scientifique (France)
Download or read book Arctica 1978 written by Centre national de la recherche scientifique (France) and published by Éditions du Centre national de la recherche scientifique. This book was released on 1982 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers and posters from the seventh Northern Libraries Colloquy, 1978, with an emphasis on bibliography, filmography, museums and archives as well as library resources.
Book Synopsis An Ecological Classification of Vegetation Types by : Samuel A. Graham
Download or read book An Ecological Classification of Vegetation Types written by Samuel A. Graham and published by . This book was released on 1955 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Arctic Vegetation Responses to Global Change by : David Watts
Download or read book Arctic Vegetation Responses to Global Change written by David Watts and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding how biological systems respond to local and global environmental change is necessary to make useful and reliable predictions of future community dynamics. Multiple facets of environmental change, such as climatic shifts and increases or declines in large fauna, can interact to produce additive or counteracting effects on vegetation. Altered composition and dominance patterns in plant communities can, in turn, have consequences for ecosystem functioning through, for example, modification of biogeochemical processes or regional climate patterns. Global scale climate change has already strongly impacted the makeup and dynamics of ecological systems. The northern tundra biome is expected to undergo large changes, which previously have and likely will affect human wellbeing into the future. Thus, the tundra ecosystems of the Low Arctic provide the context within which my dissertation expands our understanding of ecological responses to environmental change.Understanding how facets of global change, such as warming or human overexploitation of animal resources, affect plant communities in arctic tundra requires understanding responses across life history stages. In this dissertation, I have sought to address gaps in our knowledge related to the role of reproductive processes in contributing to the dynamical patterns that have become evident. In the chapters that follow, I identify the importance of accounting for individualistic species responses to change, and I further suggest that the similar patterns among arctic plant species within a functional group may be the consequence of different underlying processes.I begin this dissertation by providing some background on global change and the ensuing shifts in the Arctic biome. I then discuss how a warming climate influences the niches of arctic plants and what the consequences of these changes are for biodiversity in tundra ecosystems. One key demographic parameter that can mediate species responses to change is the regeneration niche. In Chapter 2, I addressed two of the earlier stages of the regeneration niche, the production of viable seed and germination, in an experimental context to bridge the gap between the effects of environmental change on established and establishing individuals. I hypothesized that the reproductive responses of arctic plant species to change would be species-specific and poorly predicted by plant functional type. I manipulated temperature and precipitation over three years in a factorial design and also sampled grazed and exclosed plots. The interannual variation in seed mass and germination appeared to reflect weather in those years for several species, and the effect sizes of this variation were similar to those of the warming, watering, and herbivore exclusion treatments. Grazing only affected graminoid species, but these effects were positive for some graminoids and negative for others. Both warming and watering as well as their interaction led to individualistic effects among species belonging to several different functional types, suggesting that some uses of these latter classifications are unlikely to result in reliable predictive generalities. Additionally, a few species demonstrated contrasting effects of warming and watering across years, suggesting these species are near thresholds for successful sexual reproduction. Such thresholds can occur when environmental conditions preclude plants or plant parts from attaining a minimum size required to complete reproduction.The potential existence of such thresholds indicates that amelioration of abiotic stressors, such as temperature minima that can reduce survival or fecundity, as a result of warming in the Arctic may lead to increases in sexual reproduction and recruitment. In Chapter 3, I addressed the relative contributions of sexual recruitment and asexual spread in populations of Salix glauca, a deciduous shrub increasing in abundance in many tundra landscapes, distributed along an environmental gradient comprising a shift maritime to continental climates. I hypothesized that landscapes with warmer summers would have greater evidence of sexual recruitment. To test this, I located sites that appeared to have increased in shrub cover in recent decades and collected leaf samples from neighboring ramets (stems). I found evidence that sexual recruitment occurs universally across this gradient, but the proportion of sexual recruits, inferred from the uniqueness of their genotypes, was greater in the inland landscapes that experience a continental climate, supporting my hypothesis. Additionally, I demonstrated that the probability of a ramet arising from clonal growth increases where neighbors are larger and vegetative cover is greater, suggesting light is a limiting factor for recruitment from seed.The above results suggest that the responses of arctic plant communities to climatic change are shaped by the variable responses in growth and reproduction among species. This interspecific variation can lead to shifts in patterns of plant community diversity. While recent syntheses suggest species diversity at small spatial scales has not declined in a range of ecosystems in recent years, I documented the potential for notable declines in the diversity of local assemblages of mixed shrub-graminoid tundra. In Chapter 4, I demonstrate that warming increases the accumulation of biomass, resulting in eventual declines in taxonomic diversity approximately one decade after a disruptive caterpillar outbreak. In particular, shrub abundance was negatively associated with forb richness under warming, but only when large herbivores were experimentally excluded. Additionally, the nature of the relationship between biomass and taxonomic richness went from positive in grazed and unwarmed plots to unimodal in exclosed, warmed plots. Warming thus led to increased biomass, but this only resulted in decreased local diversity in the absence of ungulate herbivory.The expansion of woody shrubs in the Arctic has become a particular focal point of research, but there remain many unknowns. In Chapter 5, I highlight the contributions of these studies to our current understanding and put them in the context of ongoing research on the causes and consequences plant community responses to global change. This dissertation adds to our understanding of the possible changes in tundra vegetation that may ensue in a warmer Arctic. It thus contributes to the broader body of knowledge on the ecology of clonal plants and the link between ecosystem function and biodiversity.