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In this study the proportion of lignin in wood tissue was analysed in 36 Scots pines differing in their form of dead bark. Material for analyses came from pure pine stands aged 89-91 years located in northern Poland. | Research Article Turk J Agric For 33 (2009) 455-462 © TÜBİTAK doi:10.3906/tar-0903-42 The relationship between the form of dead bark and lignin content in Scots pine (Pinus sylvestris L.) Tomasz JELONEK1,*, Witold PAZDROWSKI1, Magdalena ARASIMOWICZ-JELONEK2, Jarosław GZYL2, Arkadiusz TOMCZAK1, Jolanta FLORYSZAK-WIECZOREK3 1 Poznan University of Life Sciences, Department of Forest Utilisation, Wojska Polskiego 71A, 60-625 Poznań, POLAND 2Adam Mickiewicz University of Poznan, Department of Plant Ecophysiology, Umultowska 89, 61-614 Poznań, POLAND 3Poznan University of Life Sciences, Department of Plant Physiology, Wołyńska 35, 60-637 Poznań, POLAND Received: 24.03.2009 Abstract: In this study the proportion of lignin in wood tissue was analysed in 36 Scots pines differing in their form of dead bark. Material for analyses came from pure pine stands aged 89-91 years located in northern Poland. Chemical analyses were performed in the mature wood zone comprising the last 10 diameter increments located at a height of 1.3 m (DBH). Results indicate differences in lignin content and growth rate in pines whose stems were characterized by different forms of dead bark. The study showed significant differences in lignin contents between trees with shell and scaly dead bark and trees with ropy bark form. Pines with ropy bark were characterized by the lowest lignin content in relation to trees having the other 2 forms of dead bark. Moreover, a relationship was observed between diameter growth rate and lignin content in wood tissue. Key words: Form of dead bark, lignin content, Pinus sylvestris L. Introduction Variation in outer bark in Scots pine has been investigated by many botanists and foresters searching for a relationship between its form (thickness and appearance) and characteristics of trees. In 1820 Szubert, as one of the first researchers, reported that in poor sites pines are characterized by thinner outer bark, which is less regularly cracked than that of .
