Author: Publisher:
ISBN:
Category : Grassland ecology
Languages : en
Pages : 36
Book Description
Sixty Years of Change on a Central Arizona Grassland-juniper Wood-land Ecotone
Author: Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1102
Book Description
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1088
Book Description
Crop Protection Research
Author: Radiation-induced Sterility in the Pink Bollworm
Author: Alan C. BartlettPublisher:
ISBN:
Category : Insect radiosterilization
Languages : en
Pages : 1062
Book Description
Agricultural Reviews and Manuals
Author: A Legacy of Change
Author: Conrad Joseph BahrePublisher: University of Arizona Press
ISBN: 0816536392
Category : Science
Languages : en
Pages : 252
Book Description
The arrival of Anglo settlers in the 1870s marked the beginning of major vegetation changes in southeastern Arizona, including an increase in woody plants in rangelands, the degradation of riparian wetlands, and the spread of non-native plants. While many of these changes have already been linked to human land-use through comparative photographs and historic descriptions, it has long been presumed that changes in the region's climate have also contributed to vegetation change. Geographer Conrad Bahre now challenges the view that these vegetation changes are due to climatic change. Correlating his own field research with archival records and photographs, Bahre demonstrates that most of the changes follow some type of human disturbance, such as cattle grazing, fuelwood cutting, wildfire suppression, agriculture, and road construction. Indeed, all available evidence suggests that Anglo settlement brought unprecedented changes to the land. Vegetation change in the American West has long been an issue of concern. This careful scrutiny of one corner of that region—one of the most ecologically diverse areas of the United States—shows how poorly understood is the relationship between human activities and vegetation. More important, it introduces new techniques for differentiating between natural and anthropogenic factors effecting vegetation change that can be used to help ecologists understand vegetation dynamics worldwide.
Livestock Management in the American Southwest
Author: Roy JemisonPublisher: Elsevier
ISBN:
Category : Business & Economics
Languages : en
Pages : 614
Book Description
Grazing, land use history, and grazing systems of the southwest; Range ecosystems; Economic, social, and cultural aspects of livestock production and management; Research and information needs and conclusions.
General Technical Report RM.
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 236
Book Description
Author: