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Fire Management in Grand Canyon National Park
Various documents and articles about fire management, policies, and forest restoration.
The Determination of a Lifespan
The average human lifespan was around 35 years in 1950 and is now 72 years, but is still much less than the longest record of 122 years. Likewise, the present human lifespan differs as much as 30 years across the world. These differences are due to many factors such as meals, obesity, and diseases. This book clarifies these factors and suggests means for the general population to live longer. Related to this, it also reports the status of centenarians in the world and animal experiments. It provides a survey of lifespan records of animals and plants and related factors, especially genes. The results indicate that there are both plants and animals living for 10, 000 years or longer, which will be interesting to researchers and students.
Managing Gambel Oak in Southwestern Ponderosa Pine Forests
Gambel oak (Quercus gambelii) is a key deciduous species in southwestern ponderosa pine (Pinus ponderosa) forests and is important for wildlife habitat, soil processes, and human values. This report (1) summarizes Gambel oak's biological characteristics and importance in ponderosa pine forests, (2) synthesizes literature on changes in tree densities and fire frequencies since Euro-American settlement in pine-oak forests, (3) suggests management prescriptions for accomplishing various oak management objectives (for example, increasing diameter growth or acorn production), and (4) provides an appendix containing 203 Gambel oak literature citations organized by subject. Nine studies that recons...
Biodiversity and the Management of the Madrean Archipelago
This conference brought together scientists and managers from government, universities, and private organizations to examine the biological diversity and management challenges of the unique "sky island" ecosystems of the mountains of the southwestern U.S. and northwestern Mexico. Session topics included: floristic resources, plant ecology, vertebrates, invertebrates, hydrology and riparian systems, aquatic resources, fire, conservation and management, human uses through time, and visions for the future. Illustrated.
