Strukturalne i funkcjonalne modyfikacje drewna pni zamierających jesionów (Fraxinus excelsior)

• Autorzy: Tulik M. , Marciszewska K.

Warianty tytułu

EN

Structural and functional modifications in xylem of declining European ashes (Fraxinus excelsior)

• Języki publikacji: PL

Abstrakty

EN

The anatomy and functioning of stem secondary xylem in relation to the decline of European ash (Fraxinus excelsior L.) was examined and the hypothesis that declining trees show changes in the structure of wood, resulting in impaired water transport was tested. Anatomical analyses were carried out on samples comprising annual rings formed between 1970 and 2009 and collected at the breast height of the main stem of fifteen trees 40−90 years old. Trees were based upon health condition and classified as healthy, weakened or dead. Tree−ring widths as well as diameter and density of earlywood vessels were measured and the theoretical hydraulic conductivity index through the secondary xylem calculated by application of Hagen−Poisseuille formula. Over the whole investigated period the smallest early vessels were attribute to ashes dead at the time of sampling. In the period when dieback symptoms where manifested in the stand, the diminishment of vessels diameter occurred in weakened and eventually dead trees, whereas healthy trees produced even slightly larger vessels than before. Having large vessels implies that healthy trees were able to keep high hydraulic conductivity index, whereas trees in decline at this time produce smaller vessels and hence had reduced conductivity in respect to previous.

Słowa kluczowe

PL

lesnictwo; drzewa lesne; jesion wyniosly; Fraxinus excelsior; zamieranie drzew; drzewa zamierajace; drzewa zdrowe; sloje przyrostu rocznego; szerokosc; drewno wczesne; zmiany strukturalne; zmiany funkcjonalne

• Wydawca: -
• Czasopismo: Sylwan
• Rocznik: 2013
• Tom: 157
• Numer: 04
• Opis fizyczny: s.288-297,rys.,bibliogr.

Twórcy

autor

Tulik M.

• Samodzielny Zakład Botaniki Leśnej, Szkoła Główna Gospodarstwa Wiejskiego, ul.Nowoursynowska 159, 02-776 Warszawa

autor

Marciszewska K.

• Samodzielny Zakład Botaniki Leśnej, Szkoła Główna Gospodarstwa Wiejskiego, ul.Nowoursynowska 159, 02-776 Warszawa

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