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(Article of book - 1987)

Document title

Ninety years and 535 miles : vegetation changes along the Mexican border.

Authors(s) and Affiliation(s)

HUMPHREY R. R. ;

Abstract

Photographs taken in 1892-1893 of the United States-Mexico international boundary monuments in the Chihuahuan and Sonoran Deserts were compared to repeat photos taken 90 years later as a way of determining vegetation changes. Many areas that supported grasses then now support only scrub due to grazing pressures and possibly increased aridity. - (DWG)

Source

Book

ISBN : 0-8263-0945-3

Editor : University of New Mexico Press, Albuquerque - ETATS-UNIS (1987)

Millesime : 1987  [448 pages]

Bibliographic references : 62 réf.

Language

Anglais

Localisation

Réseau PRODIG - Paris

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