T
Tomáš Polák
Researcher at Charles University in Prague
Publications - 7
Citations - 177
Tomáš Polák is an academic researcher from Charles University in Prague. The author has contributed to research in topics: Picea abies & Shoot. The author has an hindex of 6, co-authored 7 publications receiving 165 citations.
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Journal ArticleDOI
A simple method for the trace determination of methanol, ethanol, acetone and pentane in human breath and in the ambient air by preconcentration on solid sorbents followed by gas chromatography.
TL;DR: It has been shown that the method is readily applicable to determination of instantaneous concentrations of the analytes in natural and industrial atmosphere and to their monitoring in human breath which is important for medical and hygienic practice.
Journal ArticleDOI
Shoot growth processes, assessed by bud development types, reflect Norway spruce vitality and sink prioritization
Tomáš Polák,Barrett N. Rock,Petya K. E. Campbell,J. Soukupová,Blanka Šolcová,Karel Zvára,Jana Albrechtová,Jana Albrechtová +7 more
TL;DR: To evaluate recovery processes in previously damaged trees a newly developed macroscopic indicator based on proportions of bud development types was investigated, indicating forest recovery was observed in the most heavily damaged areas impacted by air pollution in the past.
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Does the azimuth orientation of Norway spruce (Picea abies/L./Karst.) branches within sunlit crown part influence the heterogeneity of biochemical, structural and spectral characteristics of needles?
Zuzana Lhotáková,Jana Albrechtová,Zbyněk Malenovský,Zbyněk Malenovský,Barrett N. Rock,Tomáš Polák,Pavel Cudlín +6 more
TL;DR: In this article, three youngest needle age classes from 20 mature (100 years old or older) Norway spruce trees were sampled from upper branches of the sunlit production crown part from each of the four cardinal azimuth orientations.
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Linking foliar chemistry to forest floor solid and solution phase organic C and N in Picea abies (L.) Karst stands in northern Bohemia
Jacqueline A. Aitkenhead-Peterson,Jess E. Alexander,Jana Albrechtová,Pavel Krám,Barrett N. Rock,Pavel Cudlín,Jakub Hruška,Zuzana Lhotáková,Ryan Huntley,Filip Oulehle,Tomáš Polák,William H. McDowell +11 more
TL;DR: In this article, the authors investigated variation in forest floor water extractable DOC and DON and forest floor C and N as a function of lignin, cellulose and N contained in live canopy foliage across eight Picea abies [L] Karst stands in northern Bohemia.
Journal ArticleDOI
Macroscopic indicators for the retrospective assessment of Norway spruce crown response to stress in the Krkonoše Mountains
TL;DR: The macroscopic indicators of Norway spruce crown status, as well as branch structure transformation, were proposed to reconstruct the retrospective stress response of a tree to stress conditions over a 30-year period, assuming a sink/source relationship on carbohydrate allocation.