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.

Geoarchaeological studies can significantly enhance interpretations of human prehistory by allowing archaeologists to decipher from sediments and soils the effects of earth processes on the evidence of human activity. While a number of previous books have provided broad geographic and temporal treatments of geoarchaeology, this new volume presents a single author's view intended for North American archaeologists. Waters deals with those aspects of geoarchaeology—stratigraphy, site formation processes, and landscape reconstruction—most fundamental to archaeology, and he focuses on the late Quaternary of North America, permitting in-depth discussions of the concepts directly applicable to that research. Assuming no prior geologic knowledge on the part of the reader, Waters provides a background in fundamental geological processes and the basic tools of geoarchaeology. He then proceeds to relate specific physical processes, microenvironments, deposits, and landforms associated with riverine, desert, lake, glacial, cave, coastal, and other environments to archaeological site formation, location, and context. This practical volume illustrates the contributions of geoarchaeological investigations and demonstrates the need to make such studies an integral part of archaeological research. The text is enhanced by more than a hundred line drawings and photographs.

CONTENTS
1. Research Objectives of Geoarchaeology
2. Geoarchaeological Foundations: The Archaeological Site Matrix: Sediments and Soils / Stratigraphy / The Geoarchaeological Interpretation of Sediments, Soils, and Stratigraphy
3. Alluvial Environments: Streamflow / Sediment Erosion, Transport, and Deposition / Alluvial Environments: Rivers, Arroyos, Terraces, and Fans / Alluvial Landscapes Evolution and the Archaeological Record / Alluvial Landscape Reconstruction
4. Eolian Environments: Sediment Erosion, Transport, and Deposition / Sand Dunes / Loess and Dust / Stone Pavements / Eolian Erosion / Volcanic Ash (Tephra)
5. Springs, Lakes, Rockshelters, and Other Terrestrial Environments: Springs / Lakes / Slopes / Glaciers / Rockshelters and Caves
6. Coastal Environments: Coastal Processes / Late Quaternary Sea Level Changes / Coastal Environments / Coastal Landscape Evolution and the Archaeological Record / Coastal Landscape Reconstruction
7. The Postburial Disturbance af Archaeological Site Contexts: Cryoturbation / Argilliturbation / Graviturbation / Deformation / Other Physical Disturbances / Floralturbation / Faunalturbation
8. Geoarchaeological Research
Appendix A: Geoarchaeological Studies Illustrating the Effects of Fluvial Landscape Evolution on the Archaeological Record
Appendix B: Geoarchaeological Studies Illustrating Site-Specific Synchronic and Diachronic Alluvial Landscape Reconstructions
Appendix C: Geoarchaeological Studies Illustrating Regional Synchronic and Diachronic Alluvial Landscape Reconstructions