Advanced Search
MyIDEAS: Login

Mulch resistance to water vapor transport

Contents:

Author Info

  • Fuchs, M.
  • Hadas, A.
Registered author(s):

    Abstract

    Mulches augment soil moisture availability to plants by restraining direct evaporation of soil water. Yet, in field conditions wind decreases their resistance to water vapor transport, diminishing their efficiency as a water conservation measure. The relation between vapor transport resistance and wind speed was investigated in a wind tunnel where air flow was turbulent. The mulch material was chopped straw with bulk densities of 31 and 37 kg m-3, and chemically stabilized aggregates segregated in diameter classes 1-2, 2-4, 4-8, 8-11.2 mm, in layers 10-100 mm thick. The resistance decreased exponentially with increasing wind speed from the molecular diffusion value at zero wind speed, suggesting that turbulence penetrates the pores of the mulch and drives convective water vapor transport. Resistance rose exponentially with increasing layer thickness, a mirror reflection of the turbulence decay profile. Higher bulk density of the straw and finer aggregates augmented the resistance. The convective component of the vapor transport resistance was related to mulch area index, defined as the surface area of the solid elements of mulch per unit covered ground area. This procedure merged the effect of layer thickness and that of straw bulk density or aggregates size into a single function, indicating that friction forces proportional to internal area of the solid fabric restrain the penetration of momentum in the porous medium. Two-layered mulches combining straw and aggregates have a higher resistance than the sum of the resistances of the individual components as is expected from the attenuation of convection in the top layer. The functions derived in this study can serve as input for models evaluating the impact of mulches on soil water balance.

    Download Info

    If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
    File URL: http://www.sciencedirect.com/science/article/B6T3X-523KH7G-1/2/0674956270d4809091ef83f30e49672f
    Download Restriction: Full text for ScienceDirect subscribers only

    As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.

    Bibliographic Info

    Article provided by Elsevier in its journal Agricultural Water Management.

    Volume (Year): 98 (2011)
    Issue (Month): 6 (April)
    Pages: 990-998

    as in new window
    Handle: RePEc:eee:agiwat:v:98:y:2011:i:6:p:990-998

    Contact details of provider:
    Web page: http://www.elsevier.com/locate/agwat

    Related research

    Keywords: Evaporation Soil moisture Straw Hydrophobic aggregate Water conservation;

    References

    References listed on IDEAS
    Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
    as in new window
    1. Xie, Zhongkui & Wang, Yajun & Cheng, Guodong & Malhi, Sukhdev S. & Vera, Cecil L. & Guo, Zhihong & Zhang, Yubao, 2010. "Particle-size effects on soil temperature, evaporation, water use efficiency and watermelon yield in fields mulched with gravel and sand in semi-arid Loess Plateau of northwest China," Agricultural Water Management, Elsevier, vol. 97(6), pages 917-923, June.
    2. Xie, Zhongkui & Wang, Yajun & Jiang, Wenlan & Wei, Xinghu, 2006. "Evaporation and evapotranspiration in a watermelon field mulched with gravel of different sizes in northwest China," Agricultural Water Management, Elsevier, vol. 81(1-2), pages 173-184, March.
    3. Yamanaka, Tsutomu & Inoue, Mitsuhiro & Kaihotsu, Ichirow, 2004. "Effects of gravel mulch on water vapor transfer above and below the soil surface," Agricultural Water Management, Elsevier, vol. 67(2), pages 145-155, June.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as in new window

    Cited by:
    1. de Souza, Edivan Rodrigues & Montenegro, Abelardo Antônio de Assunção & Montenegro, Suzana Maria Gico & de Matos, José de Arimatea, 2011. "Temporal stability of soil moisture in irrigated carrot crops in Northeast Brazil," Agricultural Water Management, Elsevier, vol. 99(1), pages 26-32.

    Lists

    This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS.

    Statistics

    Access and download statistics

    Corrections

    When requesting a correction, please mention this item's handle: RePEc:eee:agiwat:v:98:y:2011:i:6:p:990-998. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Zhang, Lei).

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If references are entirely missing, you can add them using this form.

    If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.