[PDF] Mechanisms Of Range Expansion And Removal Of Mesquite In Desert Grasslands Of The Southwestern United States eBook

Author : Thomas B. Wilson
Publisher :
Page : 108 pages
File Size : 19,23 MB
Release : 2001
Category : Mesquite
ISBN :

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During the last 150 years, two species of mesquite trees in the Southwestern United States have become increasingly common in what formerly was desert grassland. These trees have spread from nearby watercourses onto relatively xeric upland areas, decreasing rangeland grass production. Management attempts to limit or reverse this spread have been largely unsuccessful. This paper reviews studies regarding mesquite natural history and management strategies, emphasizing studies published during the past decade. Mesquite possess a deep root system and are capable of fixing atmospheric N, rendering them capable of accessing resources unavailable to other plants in open rangeland. Their seeds, which remain viable for decades, have a hard exocarp and require scarification before germination. Consumption by cattle provides a means of scarification and seed dispersal, and is a major factor contributing to the spread of mesquite in open rangelands. Increases in atmospheric CO2 and winter precipitation during the past century also contribute to enhanced seed germination. Removal techniques have included herbicides, prescribed burning, grazing reduction, and mechanical removal. For increased effectiveness of these techniques, management goals must be clearly articulated; these goals include complete removal, no removal, and limited removal. Of these, limited removal appears the most feasible, using an initial herbicide application followed by periodic prescribed burning.

Author : Raymond M. Turner
Publisher : University of Arizona Press
Page : 351 pages
File Size : 17,91 MB
Release : 2021-10-19
Category : Science
ISBN : 0816546851

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The Changing Mile, originally published in 1965, was a benchmark in ecological studies, demonstrating the prevalence of change in a seemingly changeless place. Photographs made throughout the Sonoran Desert region in the late 1800s and early 1900s were juxtaposed with photographs of the same locations taken many decades later. The nearly one hundred pairs of images revealed that climate has played a strong role in initiating many changes in the region. This new book updates the classic by adding recent photographs to the original pairs, providing another three decades of data and showing even more clearly the extent of change across the landscape. During these same three decades, abundant information about climatic variability, land use, and plant ecology has accumulated, making it possible to determine causes of change with more confidence. Using nearly two hundred additional triplicate sets of unpublished photographs, The Changing Mile Revisited utilizes repeat photographs selected from almost three hundred stations located in southern Arizona, in the Pinacate region of Mexico, and along the coast of the Gulf of California. Coarse photogrammetric analysis of this enlarged photographic set shows the varied response of the region's major plant species to the forces of change. The images show vegetation across the entire region at sites ranging in elevation from sea level to a mile above sea level. Some sites are truly arid, while others are located above the desert in grassland and woodland. Common names are used for most plants and animals (with Latin equivalents in endnotes) to make the book more accessible to non-technical readers. The original Changing Mile was based upon a unique set of data that allowed the authors to evaluate the extent and magnitude of vegetation change in a large geographic region. By extending the original landmark study, The Changing Mile Revisited will remain an indispensable reference for all concerned with the fragile desert environment.

Author : Rodney W. Bovey
Publisher : Texas A&M University Press
Page : 277 pages
File Size : 45,31 MB
Release : 2016-09-30
Category : Nature
ISBN : 162349429X

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Global problem or treasure? This question has accompanied the widespread and controversial mesquite tree wherever it grows and is studied around the world. In this comprehensive reference to the genus Prosopis, rangeland scientist Rodney Bovey has gathered and synthesized years of research in a book that reflects our current state of knowledge about the biology, morphology, and management of mesquite. Environmentally adaptive, the mesquite is considered by many to be an invasive or a pest species, and Bovey addresses the concerns about mesquite encroachment worldwide. But he also explains its ecological importance in the prevention of erosion and desertification and in providing food and habitat for wildlife. In addition, Bovey traces the uses of mesquite by humans and discusses the economics of growing and harvesting mesquite. A handy guide to the names, locations, distributions, habitat, structure, and uses of several species of mesquite is included in this benchmark publication for ecologists, range managers, biologists, landowners, and students of agriculture and ecosystem science.

Author : Hasan Arman
Publisher : BoD – Books on Demand
Page : 120 pages
File Size : 28,16 MB
Release : 2018-05-23
Category : Science
ISBN : 178923154X

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Arid environments are basically associated with water scarcity. Therefore, soils will have an extremely low moisture level to support plant and animal life as well as human social life. Sustainability is the long durability of systems and processes within various adapted environmental conditions. Recently, systematic scientific studies on arid environments and sustainability have become more attractive, critical, and sound than the previous years. Sharing such experiences related to different environmental circumstances will absolutely help scientists and decision-makers to have better interpretation of their own environment. By learning lessons, appropriate, fast, and effective approaches require to implement for overwhelming such problems. Such actions will certainly lead to more secure and sustainable environments for plant, animal, and human life.

Author : Ernest Small
Publisher : CRC Press
Page : 768 pages
File Size : 35,53 MB
Release : 2013-09-23
Category : Science
ISBN : 1466585943

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Many North American plants have characteristics that are especially promising as candidates for expanding our food supply and generating new economically competitive crops. This book is an informative analysis of the top 100 indigenous food plants of North America, focusing on those species that have achieved commercial success or have substantial market potential. The book's user-friendly format provides concise information on each plant. It examines the geography and ecology, history, economic and social importance, food and industrial uses, and the economic future of each crop.