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Environmental Change and Geomorphic Response in Humid Tropical Mountains.
Mountain environments are often perceived to be austere, isolated, and inhospitable. In fact, these areas are of immense value to mankind, providing direct life support to close to 10 percent of the world's population and sustaining a wide variety of species - many of which are endemic to this environment. 'Environmental Change in Mountains and Uplands' provides detailed account of the fragile and marginal physical and socio-economic systems which make up the world's mountain regions. Discussing the direct and indirect impacts of human interference on environmental ecosystems, it then turns to the social and economic consequences of such environmental change - both upon the mountain environment itself and upon the populations who depend on mountain resources for their economic sustenance. This book includes a review of possible implications for adaption and mitigation strategies in a global context. Working within a broad temporal scale, it draws upon paleoenvironmental records to document past changes which have occured in the absence of major anthropogenic influences, as well as utilising modelling as a means to assessing future environmental change.
Environments around the globe are undergoing human-induced change. Human population growth, rapid urbanization, expanding global economy, and the diffusion of western consumer lifestyles are placing increasing pressure on natural and social systems. Global institutions, nation-states, and local communities are seeking to identify and employ sustainable solutions to these environmental and socio-economic challenges. Sustainability has emerged as a policy discourse that seeks to balance the desire and need for economic growth with the protection of the environment, and the promotion of social and environmental justice. This book contributes to the study and search for sustainable responses to global environmental change. The authors of this volume explore environmental change in different places around the world and the diverse responses to such changes. The chapters demonstrate the need for place-specific sustainable development; the authors suggest the need to see sustainable responses to environmental change as a negotiated outcome between various social actors living and working in diverse spatial, environmental and socio-economic contexts. Environmental Change and Sustainability is a timely international examination of the relationship between environmental change and sustainability. As an InTech open source volume, current and cutting edge research methodologies and research results are quickly published for the academic policy-making communities. Dimensions of environmental change and sustainability explored in this volume include: Natural science approaches to study of environmental change Importance of perception in human understanding of environmental change Role of external events and institutions in shaping sustainable responses to environmental change Importance of bottom-up sustainable development as key to reducing environmental risk and community vulnerability The need for place-based sustainable development that combines local conditions with global processes Creation of a sustainable development model that synthesizes local, traditional knowledge of the environment and environmental management with the techniques and understandings generated by modern environmental science
In the tropics, ongoing departure from the long-term climate average is more rapid and significant than anywhere on the planet, predicted to reach unprecedented conditions as early as 2020. Moreover, low latitudes harbor the majority of developing nations with limited capital available for monitoring water resources and climate change. As climate change intensifies, the interaction between altered precipitation regimes and modified vegetation and soil associated with expanding agricultural and pastoral land use can reduce the intrinsic resilience of watersheds and the ecosystems and societies they support. In this dissertation I provide insight into how climate change and land use affect watershed hydrology and channel morphology in the data-poor humid mountain tropics. I identified an unique expression of geomorphic equilibrium in mountain river channels relative to conventional metrics of geomorphic balance derived from temperate and semi-arid regions. Using physically based modeling of surface and subsurface hydrology paired with field-based channel measurements, I evaluated the response exhibited by watersheds in tectonically active steep mountain terrain under existing and altered climate and land cover scenarios. Watersheds converted from forest to pasture exhibit greater peak flow events, lower base flow and reduced resilience to increased rainfall intensity. My efforts provide a rapid and inexpensive procedure for deciphering the effects of land use and climate change without need for long-term datasets or a spatially comprehensive description of subsurface heterogeneity, allowing local resource management efforts to broaden to the watershed scale.
"Given the sheer scale of the topic under consideration here, Professor Gregory does well to condense it into bite-size pieces for the reader. I recommend this text to all undergraduate students of physical geography and earth sciences, particularly to those in their first and second years... This book is a comprehensive and (crucially) inexpensive text that will provide students with a useful source on geomorphology." - Lynda York, The Geographical Journal "I would highly recommend this to anyone doing geology or geography at university as a ′go to′ book for geomorphology and landform." - Sara Falcone, Teaching Earth Science "An excellent source of information for anyone who needs a well-informed, easy to use reference volume to introduce them to the fascinating complexities of the earth’s land surface, past, present and future." - Angela Gurnell, Queen Mary, University of London This introductory text details the land surface of the earth in a readable style covering the major issues, key themes and sensitivities of the environments/landscape. Emphasising the major ideas and their development, each chapter includes case studies and details of influential scientists (not necessarily geomorphologists) who have contributed to the progress of understanding. Providing a very clear explanation of the understanding achieved and of the debates that have arisen, the book is comprised of 12 chapters in four sections: Visualising the land surface explains and explores the composition of the land surface and outlines how it has been studied. Dynamics of the land surface considers the dynamics affecting the earth′s land surface including its influences, processes and the changes that have occurred. Environments of the land surface looks to understand the land surface in major world regions highlighting differences between the areas. Management of the land surface is an examination of the current and future prospects of the management of the earth′s land surface. With pedagogical features including further reading, questions for discussion and a glossary, this original, lively text is authored by one of the leading experts in the field and will be core reading for first and second year undergraduates on all physical geography courses.
This book compiles available knowledge of the response of mountain ecosystems to recent climate and land use change and intends to bridge the gap between science, policy and the community concerned. The chapters present key concepts, major drivers and key processes of mountain response, providing transdisciplinary orientation to mountain studies incorporating experiences of academics, community leaders and policy-makers from developed and less developed countries. The book chapters are arranged in two sections. The first section concerns the response processes of mountain environments to climate change. This section addresses climate change itself (past, current and future changes of temperature and precipitation) and its impacts on the cryosphere, hydrosphere, biosphere, and human-environment systems. The second section focuses on the response processes of mountain environments to land use/land cover change. The case studies address effects of changing agriculture and pastoralism, forest/water resources management and urbanization processes, landscape management, and biodiversity conservation. The book is designed as an interdisciplinary publication which critically evaluates developments in mountains of the world with contributions from both social and natural sciences.
The humid tropics contain some of the world's richest, most diverse, most important and most threatened environments. This book draws on recent work by geographers, biologists, ecologists, geologists and climatologists to present a complete and integrated appraisal of the natural environment of all the humid tropical regions of the world. The most complete textbook on this key subject. Fully illustrated throughout with photographs and diagrams. Informative case studies and examples. Considers the physical environment as a whole and stresses the link between the elements.
The humid tropics contain some of the world's richest, most diverse, most important and most threatened environments. This book draws on recent work by geographers, biologists, ecologists, geologists and climatologists to present a complete and integrated appraisal of the natural environment of all the humid tropical regions of the world. The most complete textbook on this key subject. Fully illustrated throughout with photographs and diagrams. Informative case studies and examples. Considers the physical environment as a whole and stresses the link between the elements.
A statement from the world's leading geomorphologists on the state of, and potential changes to, the environment.
This dissertation research aims to examine the role of abiotic and biotic factors in tropical mountains that affect plant species distributions with climate change. My research focuses on the effects biotic and abiotic factors at the lower elevation-warmer climate boundary of high elevation tropical species. I also examined the response of localized populations of species spanning a broad elevation-climate gradient to warmer climates. Using field transplant experiments and shadehouse studies, I examined the tolerance of montane tropical species to novel climatic factors such as temperature and moisture, and a novel soil microbial community. The results from the field experiment suggest that tropical montane high elevation trees cannot persist in a much warmer climate and local populations species with a broad distribution performs equally well across climate. Subsequent mesocosm studies suggest that tropical high elevation plant species may tolerate novel individual factors such as soil temperature, moisture, or non-native soil community. Further research is imperative to understand the mechanisms behind the reduced performance of high-elevation tropical species in a warmer climate and how species in high-elevation tropical forests will respond to climate change.