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"Forstschutz."
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Towards an improved understanding of bark beetle and other insect herbivore infestation in conifer forests
European forest ecosystems are increasingly exposed to stressors such as storm, drought episodes and mass attack of forest insect pests. Sustainable forest management requires a fundamental understanding of causal relationships between forest structures and the occurrence of disturbance events, as well as a well-functioning transfer of scientific knowledge into practice. Risk or predisposition assessment, phenological models or prediction of deficits in stand water supply can serve as decision support for prophylactic and protective measures in forestry. This overview addresses the theoretical approaches to insect pest-related mortality in forests that form the basis for such models. Many insect herbivore species benefit from increased temperatures and drought. For example, there is a clear correlation between bark beetle infestation and summer temperatures, storm damage and precipitation deficits. Drought stress is one of the main factors predisposing conifer forests to bark beetle infestation and significantly impacts interactions among Picea abies, Ips typographus and its associated ophiostomatoid fungi. A multi-year study focused on the effects of drought on the defence capacity and attractiveness of Norway spruce to I. typographus. The empirical dataset gained in field and laboratory experiments provides new insights into defence responses of this important tree species against biotic infestations under drought.
Journal Article
Between Two Fires
From a fire policy of prevention at all costs to today's restored
burning, Between Two Fires is America's history channeled
through the story of wildland fire management. Stephen J. Pyne
tells of a fire revolution that began in the 1960s as a reaction to
simple suppression and single-agency hegemony, and then matured
into more enlightened programs of fire management. It describes the
counterrevolution of the 1980s that stalled the movement, the
revival of reform after 1994, and the fire scene that has evolved
since then. Pyne is uniquely qualified to tell America's fire
story. The author of more than a score of books, he has told fire's
history in the United States, Australia, Canada, Europe, and the
Earth overall. In his earlier life, he spent fifteen seasons with
the North Rim Longshots at Grand Canyon National Park. In
Between Two Fires , Pyne recounts how, after the Great
Fires of 1910, a policy of fire suppression spread from America's
founding corps of foresters into a national policy that manifested
itself as a costly all-out war on fire. After fifty years of
attempted fire suppression, a revolution in thinking led to a more
pluralistic strategy for fire's restoration. The revolution
succeeded in displacing suppression as a sole strategy, but it has
failed to fully integrate fire and land management and has fallen
short of its goals. Today, the nation's backcountry and
increasingly its exurban fringe are threatened by larger and more
damaging burns, fire agencies are scrambling for funds,
firefighters continue to die, and the country seems unable to come
to grips with the fundamentals behind a rising tide of megafires.
Pyne has once again constructed a history of record that will shape
our next century of fire management. Between Two Fires is
a story of ideas, institutions, and fires. It's America's story
told through the nation's flames.
eBook
Forest guardians, forest destroyers
In this far-reaching examination of environmental problems and politics in northern Thailand, Tim Forsyth and Andrew Walker analyze deforestation, water supply, soil erosion, use of agrochemicals, and biodiversity in order to challenge popularly held notions of environmental crisis. They argue that such crises have been used to support political objectives of state expansion and control in the uplands. They have also been used to justify the alternative directions advocated by an array of NGOs.
In official and alternative discourses of economic development, the peoples living in Thailand's hill country are typically cast as either guardians or destroyers of forest resources, often depending on their ethnicity. Political and historical factors have created a simplistic, misleading, and often scientifically inaccurate environmental narrative: Hmong farmers, for example, are thought to exhibit environmentally destructive practices, whereas the Karen are seen as linked to and protective of their ancestral home. Forsyth and Walker reveal a much more complex relationship of hill farmers to the land, to other ethnic groups, and to the state. They conclude that current explanations fail to address the real causes of environmental problems and unnecessarily restrict the livelihoods of local people.
The authors' critical assessment of simplistic environmental narratives, as well as their suggestions for finding solutions, will be valuable in international policy discussions about environmental issues in rapidly developing countries. Moreover, their redefinition of northern Thailand's environmental problems, and their analysis of how political influences have reinforced inappropriate policies, demonstrate new ways of analyzing how environmental science and knowledge are important arenas for political control.
This book makes valuable contributions to Thai studies and more generally to the fields of environmental science, ecology, geography, anthropology, and political science, as well as to policy making and resource management in the developing world.
eBook
Cork oak woodlands on the edge
Cork Oak Woodlands on the Edge is an important book for anyone interested in the future of cork oak woodlands, or in the management of cultural landscapes and their associated land-use systems. In a changing world full of risks and surprises, it represents an excellent example of a multidisciplinary and holistic approach to studying, managing, and restoring an ecosystem, and will serve as a guide for other studies of this kind.
eBook
Emulating natural forest landscape disturbances
What is a natural forest disturbance? How well do we understand natural forest disturbances and how might we emulate them in forest management? What role does emulation play in forest management? Representing a range of geographic perspectives from across Canada and the United States, this book looks at the escalating public debate on the viability of natural disturbance emulation for sustaining forest landscapes from the perspective of policymakers, forestry professionals, academics, and conservationists. This book provides a scientific foundation for justifying the use of and a solid framework for examining the ambiguities inherent in emulating natural forest landscape disturbance. It acknowledges the divergent expectations that practitioners face and offers a balanced view of the promises and challenges associated with applying this emerging forest management paradigm.
eBook
Ecological methods in forest pest management
This book aims to provide a critical appraisal of the theory and practice of key methods of forest pest management. The appropriate application of these ‘ecological methods’ in the development of Integrated Pest Management (IPM) programmes depends on a clear understanding of pest biology and population dynamics, and an appreciation of the ecology and economic importance of both semi-natural and plantation forests. These aspects provide a focus for discussion throughout the book. The main themes of the first four chapters are the influence of forest composition and structure on the nature and severity of pest problems, the threat posed by the introduction of exotic pests in global trade, how risk-rating of forests can provide an early warning of outbreaks, and the role that silviculture can play in both contributing to and helping to reduce the impact of pests. The following four chapters discuss in turn the nature of tree resistance and its exploitation, the principles and practice of biological and microbial control, and the use of semiochemicals in manipulating insect populations. The final chapter on IPM includes a discussion of the economic and environmental impact of pests, with practical examples of IPM illustrated in a series of case studies. The potential impact of climate change is briefly discussed. Many of the examples and case studies relate to insect pests, but the term ‘pest’ is used in its widest sense to include fungal pathogens. Brief reference is also made to mammalian herbivores.
eBook