Of significance in this debate is the recognition that the majority of the population of arid and semi-arid lands depend on agriculture and pastoralism for subsistence. These zones exhibit ecological constraints which set limits to nomadic pastoralism and settled agriculture.
www.iisd.org/casl/ASALProjectDetails/ASAL.htm
Arid environments are extremely diverse in terms of their land forms, soils, fauna, flora, water balances and human activities. They can be divided into three types of zones: hyper-arid, arid and semi-arid. As a result of this complex characteristics' diversity, no practical definition of arid environments can be derived.
www.syl.com/travel/characteristicsofaridenvironment.htm... www.syl.com/travel/characteristicsofaridenvironment.html
A documentary film about the land and people of the Columbia Basin and the Hanford nuclear site in southeastern Washington state. Directed by Grant Aaker and Josh Wallaert. ... Arid Lands (directed by Grant Aaker and Josh Wallaert)
www.sidelongfilms.com/
Characteristics of groundwater in arid lands ... Quaternary climate history; Global warming and desertification; Characteristics of groundwater in arid lands; Utilization and conservation of groundwater; Conclusions; References...
www.unu.edu/unupress/unupbooks/uu02fe/uu02fe0d.htm
The danger in treating arid lands as a single geographical region is that an experience in a single arid land might be inappropriately applied to another arid land with dissimilar characteristics.
www.unu.edu/unupress/unupbooks/uu02fe/uu02fe04.htm
Desertification of the arid lands of the world has been proceeding--sometimes rapidly, sometimes slowly--for more than a thousand years. It has caused untold misery among those most directly affected, yet environmental destruction continues. ... Desertification Characteristics...
www.ciesin.org/docs/002-193/002-193.html
Agronomic characteristics Abstract: Recent advances in crop management ... 1986 Sep. Language: English Descriptors: Arid lands; Arid soils; Dry farming; Desert plants; Arid climate; Databases; Information centers; Cooperation 17 NAL Call. No.: SB160.N38 1988 Alternate crops for dryland production systems in northern Idaho.
www.nal.usda.gov/afsic/AFSIC_pubs/qb94-54.htm
Viewed broadly, all of the research objectives of The University of Arizona Arid Lands Program can be regarded as ecologic in nature. Hence it is pertinent to draw attention in this first of our colloquium series to a very fundamental, and indeed almost self-evident, principle of ecology--the law of limits.
alic.arid.arizona.edu/sonoran/documents/alc_climatology... alic.arid.arizona.edu/sonoran/documents/alc_climatology_aridlands.html
To overcome some of these problems in deserts of the American Southwest, the U.S. Geological Survey (USGS) established its Desert Winds Project to measure in a standard format several key meteorologic characteristics of arid lands.
pubs.usgs.gov/gip/deserts/remote/
j) Vegetation: Lack of vegetation is the single most significant feature of dry lands. ... C. Fluvial Erosion in Arid Lands ... 1. They are most pronounced, widespread, and effective in dry lands.
www.valdosta.edu/~cdenizma/personal/course2_files/Eolia... www.valdosta.edu/~cdenizma/personal/course2_files/Eolian%20landforms.htm