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Obecność martwic na pniach drzew stojących a jakość i wartość surowca dębowego

100%

Michalec K., Wasik R., Gruchala K.

Sylwan

2015

tom 159

nr 09

This paper aimed to evaluate the impact of necroses occurring on trunks of standing oak trees on their wood quality and value. The research was carried out in five study plots situated in the Meszcze Forestry, Piotrków Forest District (central Poland). The investigations covered: measuring the diameter at breast height of every injured tree with diameter ≥7 cm, estimating the length of the trunk fragment that should be cut off to remove the defect, the assessment of the quality and size of the 3−m butt−end fragment of a trunk, excluding the detected damage or rot (classification I), as well as the quality and size assessment of the same trunk fragment, though including the encountered defect (classification II). The theoretical volume of timber within the particular quality classes was computed (WAt, WBt, WCt and WDt). Afterwards, the real volumes (WAr, WBr, WCr and WDr) were compared with those of groups S2r and S4r. Based on the analysis of the quantity of damaged trees in the investigated trial plots, the lowest share of such specimens was recorded in the compartment 2a (1.6% of defective trees). Whereas, the highest share of damaged trees was encountered in the compartment 39a (8.5%). The timber of more valuable large−sized classes 'migrated', due to damages, to the groups of medium−sized timber (S2 or S4). With respect to the total volume of timber within the particular classes and groups, the greatest loss was reported in the WB class. The timber in question 'migrated' mostly to the group S2, though a part of it was classified to the group S4 as well. The established decrease in the timber value, due to damages to trunks, accounted for ca. 26%, which amounted to ca. 5.8 thous. PLN, in relation to the entire investigated material. The obtained results indicated the necessity to reduce the damages occurring in oak stands and remove the injured trees as soon as possible to avoid a significant depreciation and a value loss of raw wood.

Wysokość położenia sęków oraz lokalizacja i wielkość martwic u świerka pospolitego [Picea abies (L.) Karst.] pochodzącego z głównych ośrodków i zasięgów jego występowania w Polsce

70%

Michalec K.

Acta Agraria et Silvestria. Series Silvestris

2011

tom 49

The research presented below analyses the differences in the location of knots and injuries as well as the size of injuries on the stems of Norway spruce from different regions of Poland. The research was conducted on 32 plots located within two ranges of the occurrence of spruce in Poland: the north-eastern range and the south-western one. On the selected spruce trees, the researchers measured the height of location of knots and injuries as well as injury sizes. The analyses revealed significant differences in: the height of location of knots and overgrown injuries and the size of injuries in trees from different regions and ranges of occurrence while no such differences were found in the height of location of open injuries.

Ograniczanie wyników

1 Acta Agraria et Silvestria. Series Silvestris

1 Sylwan

2 Michalec K.

1 Gruchala K.

1 Wasik R.

1 2015

1 2011

Wyniki wyszukiwania

Obecność martwic na pniach drzew stojących a jakość i wartość surowca dębowego

Wysokość położenia sęków oraz lokalizacja i wielkość martwic u świerka pospolitego [Picea abies (L.) Karst.] pochodzącego z głównych ośrodków i zasięgów jego występowania w Polsce