By the beginning of the twenty-first century, few people could deny the reality of global change. But while most alarm has been over increasing temperatures, other changes are occurring in precipitation patterns—variations that may be due in part to global warming but also to factors such as changes in atmospheric circulation and land surfaces.

This volume provides a central source of information about this newly emerging area of global change research. It presents ongoing investigations into the responses of plant communities and ecosystems to the experimental manipulation of precipitation in a variety of field settings—particularly in the western and central United States, where precipitation is already scarce or variable. By exploring methods that can be used to predict responses of ecosystems to changes in precipitation regimes, it demonstrates new approaches to global change research and highlights the importance of precipitation regimes in structuring ecosystems.

The contributors first document the importance of precipitation, soil characteristics, and soil moisture to plant life. They then focus on the roles of precipitation amount, seasonality, and frequency in shaping varied terrestrial ecosystems: desert, sagebrush steppe, oak savanna, tall- and mixed-grass prairie, and eastern deciduous forest. These case studies illustrate many complex, tightly woven, interactive relationships among precipitation, soils, and plants—relationships that will dictate the responses of ecosystems to changes in precipitation regimes.

The approaches utilized in these chapters include spatial comparisons of vegetation structure and function across different ecosytems; analyses of changes in plant architecture and physiology in response to temporal variation in precipitation; experiments to manipulate water availability; and modeling approaches that characterize the relationships between climate variables and vegetation types. All seek to assess vegetation responses to major shifts in climate that appear to be occurring at present and may become the norm in the future.

As the first volume to discuss and document current and cutting-edge concepts and approaches to research into changing precipitation regimes and terrestrial ecosystems, this book shows the importance of developing reliable predictions of the precipitation changes that may occur with global warming. These studies clearly demonstrate that patterns of environmental variation and the nature of vegetation responses are complex phenomena that are only beginning to be understood, and that these experimental approaches are critical for our understanding of future change.

Savannas are ecosytems with a continuous grass layer and scattered trees or shrubs. These lands occupy nearly a third of the earth’s land surface and are an important resource not only in world economies but also as repositories of biodiversity. Because savannas are generally thought of as tropical ecosystems, most reviews of the literature have tended to disregard savannas found in temperate zones. Yet these ecosystems are both extensive and diverse in North America, ranging from longleaf pine habitats along the Atlantic coastal plain to xeric piñon-juniper communities of the Great Basin-ecosystems seemingly disparate, yet similar enough to merit study as savannas. This book provides an overview of the patterns and processes shared by these ecosystems and offers substantive ideas regarding future management and research efforts. It describes the composition geographic distribution, climate, soils, and uses of savannas throughout North America, summarizing and integrating a wide array of literature. While discussing these ecological patterns and processes. McPherson develops a framework for implementing management practices and safeguarding the future of these important wildland ecosystems. Ecology and Management of North American Savannas takes a major step toward establishing the science of savanna ecology for North America. It encourages constructive debate and relevant research on these important systems and will also serve as a useful resource in biogeography, plant ecology, and rangeland management.