Empirical coefficients for estimating evapotranspiration of Scots pine (Pinus sylvestris) − preliminary research
2018
Biniak-Pierog, M., Wroclaw Univ. of Environmental and Life Sciences (Poland) | Zyromski, A., Wroclaw Univ. of Environmental and Life Sciences (Poland) | Swider, K., Wroclaw Univ. of Environmental and Life Sciences (Poland) | Zmuda, R., Wroclaw Univ. of Environmental and Life Sciences (Poland)
The objective of this study was to develop empirical coefficients for the estimation of evapotranspiration of Scots pine (Pinus sylvestris). A field experiment was conducted in the area of the Department Agro- and Hydrometeorology Observatory, University of Environmental and Life Sciences in Wrocław, Poland, from the 1st of May till the 31st of October, 2016. Measurements of evapotraspiration (ETR) were conducted in soil evaporimeters in three replicates. In parallel to the evaporimeter measurements, direct measurements of actual values of evaporation from open water surface (EW) were conducted with the use of an evaporimeter type EWP 992. In addition, the diurnal values of index evaporation were calculated with the FAO Penman-Monteith formula (EP). Empirical decade indices for the estimation of Scots pine evapotranspiration were determined in two variants. The first variant consisted in the determination of the quotient of measured evapotranspiration ETR and evaporation from open water surface EW (index kw). In the second variant, the components of the quotient were the ETR and the index evaporation calculated with the FAO Penman-Monteith formula (EP) (index kp). The conducted analysis showed that variation in the values of evapotranspiration totals is more pronounced with extension of the time step, for which it is summed up. Basing on precipitation water alone, Scots pine adapts its evapotranspiration to the rhythm of water supply. In the case of the conditions of Wrocław, the maximum evapotranspiration total for a month occurs in July. Analyses of the possibility of determination of empirical indices on the basis of measurements of evaporation from open water surface performed by means of the evaporimeter type EWP 992 and of diurnal values of index evaporation calculated with the FAO-Penman-Monteith formula indicate a possibility of spatial interpretation of Scots pine evapotranspiration.
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