Water from air: An overlooked source of moisture in arid and semiarid regions

Scientific Reports
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Abstract

Water drives the functioning of Earth’s arid and semiarid lands. Drylands can obtain water from sources other than precipitation, yet little is known about how non-rainfall water inputs influence dryland communities and their activity. In particular, water vapor adsorption – movement of atmospheric water vapor into soil when soil air is drier than the overlying air – likely occurs often in drylands, yet its effects on ecosystem processes are not known. By adding 18O-enriched water vapor to the atmosphere of a closed system, we documented the conversion of water vapor to soil liquid water across a temperature range typical of arid ecosystems. This phenomenon rapidly increased soil moisture and stimulated microbial carbon (C) cycling, and the flux of water vapor to soil had a stronger impact than temperature on microbial activity. In a semiarid grassland, we also observed that non-rainfall water inputs stimulated microbial activity and C cycling. Together these data suggest that, during rain-free periods, atmospheric moisture in drylands may significantly contribute to variation in soil water content, thereby influencing ecosystem processes. The simple physical process of adsorption of water vapor to soil particles, forming liquid water, represents an overlooked but potentially important contributor to C cycling in drylands.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Water from air: An overlooked source of moisture in arid and semiarid regions
Series title Scientific Reports
DOI 10.1038/srep13767
Volume 5
Year Published 2015
Language English
Publisher Nature Publishing Group
Publisher location London
Contributing office(s) Southwest Biological Science Center
Description 6 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Scientific Reports
First page 13767
Online Only (Y/N) Y
Additional Online Files (Y/N) N