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  • The effect of precipitation pulses on evaporation of deeply buried phreatic water in extra-arid areas.

    Author(s) : Li HongShouWu FasiZhan HongTaoQiu FeiWang WanFu

    Author Affiliation : Conservation Institute of Dunhuang Academy, Dunhuang, 736200 Gansu, China.

    Author Email : dhlhs69@163.com

    Journal article : Vadose Zone Journal 2016 Vol.15 No.5 pp.0127

    Abstract : Past researchresearchSubject Category: Disciplines, Occupations and Industries
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    has shown that evaporationevaporationSubject Category: Miscellaneous
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    of deeply buried phreatic water occurs in extra-arid areas where the soil surface is very dry. A dry surface layer can suppress the evaporation of capillary water, but it is not clear whether it suppresses deeply buried phreatic evaporation (PE). We deduced that the PE could be suppressed by a dry surface soil. Therefore, as the soil-water contentwater contentSubject Category: Properties
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    increases during a precipitation pulse, this can lead to an increase in PE. To investigate the effects of precipitation pulses on PE, a simulated 10-mm precipitation recyclingrecyclingSubject Category: Miscellaneous
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    experiment using a shed-air-conditioning condensationcondensationSubject Category: Miscellaneous
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    method was performed on Gobi Desertgobi desertSubject Category: Topographic Features
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    land at the top of the Mogao Grottoes in 2011 to 2015. The results show that after the 10 mm of precipitation was completely recycled, the PE increased by 28.9% compared with the control during the following 3 yr. In addition, the soil moisturemoistureSubject Category: Miscellaneous
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    increased in the 10- to 20-cm layer for a long time. We hypothesize that this is a soil-water hysteresishysteresisSubject Category: Miscellaneous
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    phenomenon, which is important for the observed differences in the evaporation rate, and it is apparent that the higher water content in the shallow layer is conducive to PE entering into the atmosphereatmosphereSubject Category: Miscellaneous
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    . This preliminary study reveals the effect of precipitation pulses on deeply buried PE; this hysteresis phenomenon must be analyzed in further studies.

    ISSN : 1539-1663

    URL : http://vzj.geoscienceworld.org/conten...

    Record Number : 20163233692

    Publisher : Soil Science Society of America Inc.

    Location of publication : Madison

    Country of publication : USA

    Language of text : English

    Indexing terms for this abstract:

    Descriptor(s) : arid landsarid landsSubject Category: Habitats
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    , atmosphereatmosphereSubject Category: Miscellaneous
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    , condensationcondensationSubject Category: Miscellaneous
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    , evaporationevaporationSubject Category: Miscellaneous
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    , Gobi Desertgobi desertSubject Category: Topographic Features
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    , hysteresishysteresisSubject Category: Miscellaneous
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    , moisturemoistureSubject Category: Miscellaneous
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    , recyclingrecyclingSubject Category: Miscellaneous
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    , researchresearchSubject Category: Disciplines, Occupations and Industries
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    , soilsoilSubject Category: Miscellaneous
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    , soil watersoil waterSubject Category: Miscellaneous
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    , water contentwater contentSubject Category: Properties
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    Identifier(s) : soil moisture, studies