Title: Markvattenhalt och temperatur i sandig jordbruksmark vid Ilstorp, centrala Skåne : en mätnings- och modelleringsstudie
Abstract: This work presents the results of a combined field measurement and modeling study of the
soil moisture and surface energy balance at Ilstorp near Sjobo in central Scania. The focus of
the study is to investigate the water content of the upper few centimeters of a soil profile.
Relevant meteorological variables were measured at the study site during April to June 1999.
The field data were used to calibrate the SOIL model and validate the simulations. This essay
is related to a major project WEELS (Wind Erosion on European Light Soils) which aims at
evaluating and quantifying the effect of wind erosion on sandy soils in northern Europe. The
first part of this study considers the heat and water conditions of a bare soil. In the second
part, the sensivity of the SOIL model was analysed when applied to a field with growing
potato crop. The meteorological variables air temperature and relative humidity, wind speed,
global radiation, net radiation and precipitation were used as driving variables to the model.
Soil moisture and soil temperature measured at three levels were used to validate the model.
The simulations were in good agreement with observations, although the soil evaporation
tended to be underestimated when the Penman-Montieth equation was used. When using the
energy balance method a substantial soil vapour correction factor had to be included to
account for the difference between the modeled surface vapour pressure and the modeled
water potential of the mid topsoil layer. The soil temperatures were generally overestimated,
except when air temperature was used as soil surface temperature. The period of
measurements with potato crop cover was too short to give any reliable results. But a
sensitivity test indicates that changes of LAI during an early crop development stage would
not result in any significant difference in soil moisture content.
Publication Year: 2000
Publication Date: 2000-01-01
Language: en
Type: article
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Cited By Count: 24
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