This book presents the latest scientific and management information on multiaged silviculture, an emerging strategy for managing forestry systems worldwide. Over recent decades, forest science and management have tended to emphasize plantation silviculture. Whilst this clearly meets our wood production needs, many of the world's forests need to be managed far less intensively and more flexibly in order to maintain their natural ecosystem functions together with the values inherent in those processes. Developing multiaged management strategies for these complex forest ecosystems represents a global challenge to successfully integrate available science with sustainable management practices. Multiaged Silviculture covers the ecology and dynamics of multiaged stands, the management operations associated with regeneration, tending, and stocking control, and the implications of this strategy on production, genetic diversity, and stand health. It is primarily aimed at graduate level students and researchers in the fields of forestry and silviculture, but will also be of relevance and use to all professional foresters and silviculturists.

Encompassing nearly seven thousand acres amid the woodlands of the Sangre de Cristo Mountains in northern New Mexico, the land that is now Pecos National Historical Park has witnessed thousands of years of cultural history stretching back to the Native peoples who long ago inhabited the pueblos of Pecos, then known as Cicuye. Once a trading center where Pueblo Indians, Spanish soldiers and settlers, and Plains Indians encountered one another, not always peacefully, Pecos was a stop on the Santa Fe Trail in the early 1800s and, later, on the first railroad in New Mexico. It was the site of a critical Civil War battle and in the twentieth century became a tourist destination. This book tells the story of how, over five centuries, cultures and peoples converged at Pecos and transformed its environment, ultimately shaping the landscape that greets park visitors today. Spanning the period from 1540, when Spaniards first arrived, into the twenty-first century, Crossroads of Change focuses on the history of the natural and historic resources Pecos National Historical Park now protects and interprets: the ruins of Pecos Pueblo and a Spanish mission church, a stage stop along the Santa Fe Trail, the Civil War battlefield of Glorieta Pass, a twentieth-century cattle ranch, and the national park itself. In an engaging style, authors Cori Knudten and Maren Bzdek detail the transformations of Pecos over time, often driven by the collision of different cultures, such as that between the Franciscan friars and Pecos Indians in the seventeenth century, and by the introduction of new animals, crops, and agricultural practices—but also by the natural forces of fire, drought, and erosion. Located on a natural trade route, Pecos has long served as a portal between different cultures and environments. Documenting this transformation over the ages, Crossroads of Change also, perhaps, shows us Pecos National Historical Park as a portal to the future.

A variety of air pollutants are emitted into the atmosphere from human-caused and natural emissions sources throughout the United States and elsewhere. These contaminants impact sensitive natural resources in wilderness, including the national parks. The system of national parks in the United States is among our greatest assets. This book provides a compilation and synthesis of current scientific understanding regarding the causes and effects of these pollutants within national park lands. It describes pollutant emissions, deposition, and exposures; it identifies the critical (tipping point) loads of pollutant deposition at which adverse impacts are manifested.