Responses Of Plant Communities To Grazing In The Southwestern United States

Responses of Plant Communities to Grazing in the Southwestern United States   PDF
Author: Daniel G. Milchunas
Publisher:
ISBN:
Size: 27.38 MB
Format: PDF, ePub
Category : Grazing
Languages : en
Pages : 126
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Grazing by wild and domestic mammals can have small to large effects on plant communities, depending on characteristics of the particular community and of the type and intensity of grazing. The broad objective of this report was to extensively review literature on the effects of grazing on 25 plant communities of the southwestern U.S. in terms of plant species composition, aboveground primary productivity, and root and soil attributes. Livestock grazing management and grazing systems are assessed, as are effects of small and large native mammals and feral species, when data are available. Emphasis is placed on the evolutionary history of grazing and productivity of the particular communities as determinants of response. After reviewing available studies for each community type, we compare changes in species composition with grazing among community types. Comparisons are also made between southwestern communities with a relatively short history of grazing and communities of the adjacent Great Plains with a long evolutionary history of grazing. Evidence for grazing as a factor in shifts from grasslands to shrublands is considered. An appendix outlines a new community classification system, which is followed in describing grazing impacts in prior sections.

Agrindex

Agrindex PDF
Author:
Publisher:
ISBN:
Size: 19.48 MB
Format: PDF, ePub, Docs
Category : Agriculture
Languages : en
Pages :
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Pre Hispanic Occupance In The Valley Of Sonora Mexico

Pre Hispanic Occupance in the Valley of Sonora  Mexico PDF
Author: William E. Doolittle
Publisher: University of Arizona Press
ISBN: 9780816510108
Size: 25.63 MB
Format: PDF, Docs
Category : Social Science
Languages : en
Pages : 96
View: 2477

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“[This book] presents a great amount of new information for a poorly known or understood area of northern Mexico, and provides a pleasant integration of the methods and theories of anthropology, geography, and ecology in a well-organized manner. . . . This report represents an important contribution to our understanding of cultural evolution and environmental adaptation in the Valley of Sonora and lays a strong framework for future studies and discussions.”—Journal of Arizona History

Rangelands

Rangelands PDF
Author:
Publisher:
ISBN:
Size: 14.96 MB
Format: PDF, Mobi
Category : Range management
Languages : en
Pages :
View: 630

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Oak Forest Ecosystems

Oak Forest Ecosystems PDF
Author: William J. McShea
Publisher:
ISBN:
Size: 27.22 MB
Format: PDF, ePub
Category : Science
Languages : en
Pages : 432
View: 5705

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With the demise of the American chesnut, oaks are more vital than ever within the web of North American wildlife. This volume focuses on the relationship between an oak forest's acorn yield and the species of wildlife that depend on it.