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Diurnal and seasonal soil water uptake and flux within a bermudagrass root zone

Author:
Rice, R.C.
Source:
Soil Science Society of America journal 1975 v.39 no.3 pp. 394
ISSN:
0361-5995
Subject:
Cynodon dactylon, diurnal variation, growing season, hydraulic conductivity, rhizosphere, root water potential, seasonal variation, soil water, soil water content, soil water movement, water content, water uptake
Abstract:
Diurnal water movement within a bermudagrass [Cynodon dactylon (L.) Pers.] root zone and the uptake of water by the roots was studied in a field plot. A fast response tensiometer-pressure-transducer system was used to measure the hydraulic heads. The relations of pressure head to water content and to hydraulic conductivity were determined in situ. Diurnal water content and soil water flux profiles were derived by using the established hydraulic properties. The fast response tensiometer system enabled calculation of flux and water content changes over 2-hour intervals. Diurnal water extraction rates calculated for different depths and times during the growing season yielded evapotranspiration rates that agreed well with rates measured on similar days in previous years using a lysimeter.
Agid:
54592
Handle:
10113/54592