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Type of publication: Straipsnis konferencijos medžiagoje Clarivate Analytics Web of Science ar/ir Scopus / Article in Clarivate Analytics Web of Science or Scopus DB conference proceedings (P1a)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Grybauskienė, Vilda
Title: Measurement and estimation of evapotranspiration for Spruce (Pice abies) seedlings
Is part of: Rural development 2009 : 4th international scientific conference, 15-17 October, 2009, Akademija, Kaunas region, Lithuania : proceedings. Akademija : Lithuanian University of Agriculture, Vol. 4, b. 2 (2009)
Extent: p. 29-33
Date: 2009
Keywords: Biological coefficients;Evapotranspiration;Seedlings
Abstract: The water balance of agro ecological systems is a key parameter for most physical and physiological processes within the system soil-crop-climate. Therefore it is of grate importance to calculate the water budget parameters in the required scale. The field study was conducted in the period of 2002-2005. Seedlings were planted in Land reclamation department experimental fields at the Lithuanian University of Agriculture. Seedlings were grown under standard nursery cultural practices until being transplanted into new fields in mid of April 2002 and 2004. In 2002 the mean temperature during the vegetation period was 2.2°C above the long-tenn average (+15°C). In the same period of 2003 mean daily temperature during the vegetation period was 0.7°C above the long tem average, 2004-0.6"C les than average, at 2OO5-O.3°C above the long tem average. The precipitation at 2002 was 233 mm (average-337 mm) and at the same period at 2003-301 mm, 2004-312 mm, 2005-378 mm. Having analyzed the total evapotranspiration of individual months it was determined that first year seedlings growing under natural conditions lave evaporated approx 10-30 mmdecade ' during May-June months, whereas during July and August months -10-30 mmdecade1, in September the evjporation varied (during the decade) within the limits of 7-14 mmdecade'. After compare values of biological coefficients at different seedlings grooving year it was determinate that biological coefficients for first year seedlings at the average of 23% smaller than coefficients of second growing year seedlings. Such bigger differences good seemed at May, and then differences reach from 56% of 1 decade, till 30% - third. At the next months differences reach about 15%, but it wasn't defining difference smaller than 10%. So it possible to say that biological coefficients for first grooving year seedlings can not by used for second growing year seedlings
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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