Methodical problems concerning soil heat flux measurement - verification of the data in respect to obtained by other method in the multiday-series of measures

The linear regression equations describing relation of soil heat flux density values in daily course derived from the indirect (combined) method and flux-plates were used for correction of heat flux plate data on a given day. In the case the gaps occur in comparative materials (i.e. from indirect method), the correction problem of heat flux plate data in the multiday series of measures may be solved in the following way: applying the equation from one day (recognized as representative) for other days, by determination of the correction equation on the basis of the data comprised of a few days together, or a set of data from a great number of days during the measurement season. All these conceptions of performance correction of heat flux plate data were examined regarding their usefulness (exactly, the error magnitude obtained using these equations), but only in respect to days and periods without precipitation. It was stated that applying one equation for correction of heat flux plate data in the course of a long (e.g. several months) period is unreasonable (improper). However, the correction using the equation from one day for the other days, as well as the equation obtained from a few days give correct results on condition that the days taken into consideration are not too distant and precipitation is not recorded at this time (the soil physical properties did not undergo any significant changes)