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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Hello, My studies seem to indicate that the changes are dependant on the moisture content at the deeper levels, and the temperature change at the shallower levels. Perhaps the temperature gradient? This is a most interesting phenomena, and I would like to know more about it. This summer will most probably bring more info from sensor loggers. > You said: > > I am a student in the UK and am concentrating my study on the diurnal = > > changes of soil moisture at depth, deeper than 60cm's in the soil. = > > Could you point me in the right direction for references which deal with = > > diurnal 'recharge' in soil moisture, or 'overnight resorption'. > > Probably not what you're looking for, but since no one else has > responded... > > I worked on a project studying diurnal changes in soil water > potential for quite a few years. The focus was on shallower depths, > but diurnal fluctuations were seen at 80 and 100 cm depths as > well. Note that these changes appeared to be plant mediated, and > we were studying water potential (via soil psychrometry), not water > content. Regards Johan Smit P.O.Box 4742 George East 6539 Rep of South Africa Tel/fax +27 44 8745533 Mobile (082) 8644914 smitjs@mweb.co.za