My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 41 No. 3, p. 455-460
     
    Received: Oct 26, 1976
    Published: May, 1977


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1977.03615995004100030005x

Diurnal Soil Water Regime in the Tilled Plow Layer of a Warm Humid Climate1

  1. R. R. Bruce,
  2. A. W. Thomas,
  3. L. A. Harper and
  4. R. A. Leonard2

Abstract

Abstract

The soil water content in 10 depth intervals in the surface 15 cm of soil was determined hourly for 9 days in June at 83° 25′W, 33° 52′N. Over the same period at 15-min intervals soil temperatures were measured at eight depths, windspeed and air temperatures at six elevations, atmospheric water vapor pressures at three elevations, incident solar and net radiation at one meter. From the microclimate data, flux of water vapor at the soil surface was calculated, which was then used to compute soil water flux at several depths by using soil water content data. The diurnal soil water content and soil water flux patterns are compared for a dry period before a rainfall event and afterward. Dramatic diurnal variation of the soil water content at depths < 2 cm was observed. This variation during periods of no rain is related to daily radiation inputs at the soil surface, which generated the observed temperature and soil water gradients responsible for soil water redistribution. Occurrence of rainfall and infiltration events during the measurement period show additional dynamics of the field system. Description of the diurnal soil water dynamics in the plowlayer provide a basis for examining soil processes dependent upon soil water regime.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America