Temperature Effects on the Ash Colour of Forest Litter Temperatūros taka mi ko paklot s pelen spalvai

. Research was carried out to identify the influence of temperature (150, 250, 350, 450, 550oC) on the ash colour of Acer platanoides L. leaf litter and Pinus sylvestris L. needle litter samples collected from deciduous coniferous mixed forest in Lithuania (54o43‘ N 25o19‘ E) in April 2010. To achieve the objective, a laboratory experiment was conducted to determine ash samples using the Munsell Colour Chart. The analysis of colours has demonstrated that considering all litter samples, an increase in the temperature of litter heating was found to increase ash colour values (r = 0.92; p = 0.01). All the samples (n = 50) of both litter species were divided into categories 2.5Y (5 samples), 7.5YR (10 samples) and 10YR (35 samples). The total black Munsell colour was observed at a temperature of 350oC for both litter species. Needle ash started turning bright at a temperature of 550oC while the complete consumption of leaf litter was visible at a temperature of 450oC. We conclude that the Munsell Colour Chart used for predicting the colour of ash is an informative feature to have the primary classification of ash. It is imperative to analyse the colour of the litter ash of the selected tree species in order to quickly and easily assess and predict their possible impact on the surrounding environment. Tyrimas atliktas siekiant nustatyti temperatūros tak (150, 250, 350, 450, 550 oC) paprastosios pu ies spygli ir paprastojo klevo lap , surinkt i lapuo i ir spygliuo i mi raus mi ko Lietuvoje (54° 43 N 25° 19 E) 2010- j baland , pelen spalvai. Laboratorijoje Munsell spalv sistema buvo naudojama, norint nustatyti pelen spalvos reik mes. Tyrimas parod , kad didinant degimo temperatūr vis pelen spalv vert s atitinkamai did jo (r = 0,92, p = 0,01). Pagal spalv skal visus m ginius (50) galima suskirstyti kategorijas: 2.5Y (5 m giniai), 7.5YR (10 m gini ) ir 10YR (35 m giniai). Juoda spalva buvo stebima abiej rū i pelenuose, kurie buvo deginami 350 oC temperatūroje. Spygli pelenai tapo viesūs esant 550 oC temperatūrai, o vies jantys lap pelenai pasteb ti 450 oC temperatūroje. Galime teigti, kad Munsell spalv sistemos naudojimas pelen spalvai nustatyti yra informatyvus pirmin s pelen klasifikacijos rodiklis. Straipsnis angl kalba