Restoring Desert Ecosystems

Authored by: Scott R. Abella

Routledge Handbook of Ecological and Environmental Restoration

Print publication date:  May  2017
Online publication date:  May  2017

Print ISBN: 9781138922129
eBook ISBN: 9781315685977
Adobe ISBN:

10.4324/9781315685977.ch12

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Abstract

Deserts include arid and semi-arid lands where evaporation plus transpiration (water lost from plants to the air) exceeds precipitation. The 2005 Millennium Ecosystem Assessment categorized dryland climates as hyper-arid, arid, semi-arid and sub-humid (Table 12.1). This classification was based on an aridity index, defined by how much greater evapotranspiration is than precipitation. Hyper-arid lands have at least 20 times more evapotranspiration than precipitation, indicating a moisture deficit. For comparison, humid climates often have less evapotranspiration than precipitation.

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