Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Determination of the compressive strength parallel to the grain of resinous yellow pine heartwood

100%

Mankowski P., Laskowska A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2020

|

tom 109

2

Circumferential variation in heartwood in stands of black locust (Robinia pseudoacacia L.)

100%

Klisz M., Wojda T., Jastrzebowski S., Ukalska J.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

|

2015

|

tom 58

|

nr 195

Within the framework of work on the anatomical structure and durability features of wood, as well as analyses of radial growth, a preliminary analysis was carried out in regard to variation in the heartwood within Black locust trees. The research was carried out in three stands of straight-stemmed trees in western Poland. The variation displayed by the heartwood around its circumference and the eccentricity of the trunks was characterised with reference to: the heartwood radial index (HRI), the cross-sectional shape factor for heartwood (CSsf) and the pith eccentricity index (PEcc). The results confirmed a relationship between the degree of variation around the circumference of the heartwood and the mean age of the stands, while at the same time making clear the high level of differentiation in radial variation at the level of the individual tree. The findings suggest that the fertility of the habitat does not exert much of an influence on the generation of heartwood in Black locust trees. No statistically significant relationship was obtained when the circumferential variation of the heartwood was set against the total height or diameter at breast-height. Only in the case of crown length, and then only at the Wołów site, was there a moderate negative correlation with the coefficients of circumferential variation.

3

Decay of oak heartwood by selected fungi species

84%

Szewczyk W., Molinska-Glura M.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2010

|

tom 09

|

nr 3-4

One of the methods limiting the damages done by Armillaria species is to decrease the number of dead wood stumps attacked by it, particularly it refers to deciduous tree stumps.The objective of the presented paper was an attempt to estimate the possibility to select some saprotrophic fungi species whose ability of decaying oak wood is higher and faster than that of Armillaria ostoyae (Romagn.) Herink and Armillaria gallica Marxm & Romagn, and which could be utilized in a biological protection method preventing Armillaria root-wood attack. All analyzed wood samples were colonized by tested mycelia. Among the fungi which could be utilized in a biological method of protection against root mould caused by Armillaria, the fungus Tramestes versicolor has shown to be the best suited for this purpose. Four different isolates were tested, which have confirmed their efficiency in decaying oak heartwood. Therefore, this fungus could be used for the elaboration of a biopreparation protecting effectively against Armillaria root rot.

4

Comparative study of qualitative structure the beech logs sorted by the old and the new European standard EN 1316-1

84%

Racko V., Cunderlik I.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2013

|

tom 84

5

The chemical composition of oak wood after prolonged influence of variable weather conditions

84%

Krutul D., Zielenkiewicz T., Zawadzki J., Radomski A., Antczak A., Drozdzek M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2015

|

tom 92

6

Proportion of sapwood and heartwood in stems of European Larch (Larix decidua Mill.) origin from provenances experimental plot

84%

Jakubowski M., Szaban J., Kowalkowski W., Pawlaczyk A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2014

|

tom 88

Proportion of sapwood and heartwood in stems of European Larch (Larix decidua Mill.) origin from provenances experimental plot. The aim of this work was to statě wether the wood from different provenances of European Larch (Larix decidua Mili.) show differences in proportion of sapwood and heartwood in stems. Research were carried out on 56 trees erepresenting 6 provenances of larch: Bliżyn (10), Czerniejewo (5), Konstancjewo-Tomkowo (3), Krościenko (15), Rawa Mazowiecka-Trębaczew (6), Skarżysko (9). This plot is a part of unique research area established in 1966. Results show important differences between heartwood-sapwood proportion for two provenances: Krościenko - the heighest proportion (largest volume of heartwood) and Bliżyn the lowes proportion (least volume of heartwood). The other provenances show similar proportions.

7

Effect of site fertility upon formation of heartwood in timber of Scots pine [Pinus sylvestris L.]

84%

Splawa-Neyman S., Pazdrowski W.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

|

2004

|

tom 47

|

nr 171

8

Effect of site fertility upon formation of heartwood in timber of Scots pine [Pinus sylvestris L.]

84%

Splawa-Neyman S., Pazdrowski W.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

2001

|

tom 32

9

Percentage share of sapwood and heartwood in stems of European larch (Larix decidua Mill.) representing II and III class of age grown in different forest site types, representing main tree stand at Kraft biosocial classification

67%

Nawrot M., Pazdrowski W., Szymanski M.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2008

|

tom 07

|

nr 1

The study is an attempt to determine share of sapwood and heartwood in stems of European larch trees from II and III class of age, grown in conditions of fresh coniferous mixed forest site (BMśw), fresh forest mixed site (LMśw), fresh forest site (Lśw). The highest hare of heartwood was observed in stems of European larch in conditions of fresh forest site Lśw, and the smallest in conditions of fresh coniferous mixed forest site (BMśw). Differences were also observed within the investigated classes of age, and higher share of heartwood observed in III class of age. The smallest share of heartwood characterized codominant trees and the highest dominant trees (from main tree stand in Kraft classification).

10

Decay of the heartwood in lower and upper trunk of Pinus sylvestris by Porodaedalea pini

67%

Szewczyk W.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2016

|

tom 15

|

nr 3

11

Influence of knots on the content of chemical substances in knot adjacent oak wood (Quercus petraea Liebl.)

67%

Krutul D., Zielenkiewicz T., Zawadzki J., Radomski A., Antczak A., Drozdzek M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2013

|

tom 83

12

Variability of the share of heartwood on the stem cross-section of Douglas fir (Pseudotsuga menziesii var. viridis Franco) in Poland

67%

Wasik R.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2007

|

tom 06

|

nr 4

This paper presents the results of investigation into the variability of the share of heartwood on the stem cross-section of Douglas fir in Poland. The research was conducted in Douglas fir stands in the IV and V age classes. The feature was analysed on increment cores taken from the trees at 1.3 m level from the base of the stem, in the N and S direction. The differences of the share of heartwood between Douglas firs of the V and VI age classes as well as between the trees growing in moderate and broken crown closure were not significant. No significant differences occurred between specimens of different vitality, either; however, the trend towards increasing the share of heartwood in weak trees with relation to normal and lush ones was noticeable. No significant correlations between the share of heartwood and crown parameters were noted. Three regions were distinguished in the territory of Poland: the southern and north-western ones, where Douglas firs have a higher share of heartwood on the stem cross-section, and the central-western one, where the share is lower.

13

Influence of thermal modification of Scots pine wood (Pinus sylvestris L.) on color changes

67%

Jankowska A., Kozakiewicz P.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2014

|

tom 88

Influence of thermal modification of Scots pine wood (Pinus syhestris L.) on color changes. This study describes experiments of testing color of heat treated wood samples. Heat treatment was done at 150, 160, 170 i 180 °C during 2,5 h in over heated steam. Color measurcment was made according CIE LCh system. The experiment show that thermally treatment caused darkening of wood. The higher temperature of modification is, the greater changes in color are and difference between sapwood and heartwood are lower. Heartwood of Scots pine showed higher changes than sapwood.

14

Investigation of iron content in fossil oak from a medieval settlement in Plonsk

67%

Mankowski P., Kozakiewicz P., Zielenkiewicz T.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2013

|

tom 83

15

Axial and radial variation in the proportions of sapwood and heartwood in stems of common oak [Quercus robur L.] depending on site type, age class and social class of tree position

67%

Szymanski M., Pazdrowski W., Kazmierczak K., Manka K., Nawrot M.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2008

|

tom 07

|

nr 2

45-58

16

Radial and axial variability of the proportion of sapwood and heartwood in stems of Scots pine trees (Pinus sylvestris L.) developed in conditions of former farmlands and typical forest sites

67%

Jelonek T., Pazdrowski W., Tomczak A., Stypula I.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

|

2006

|

tom 09

|

nr 3

17

Investigation of round Scots pine wood WC01 class using X-ray computer tomography

67%

Zaton P., Kozakiewicz P., Mankowski P.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2022

|

tom 117

18

Emission of volatile organic compounds from cross section of pine wood (Pinus sylvestris L.)

67%

Czajka M., Fabisiak E.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2012

|

tom 77

Emission of volatile organic compounds from cross section of pine wood (Pinus sylvestris L.). The level of emission of volatile organic compounds from heartwood and sapwood part of pine wood was determined. The tests were performed according to the chamber method based on the requirements of ISO 16000 standards. Air from the chamber was sampled after 3, 7 and 14 days. Within the whole test period the heartwood sample emitted several times higher amounts of volatile organic compounds than the sapwood sample. In both cases the composition of the analysed air was dominated by terpenes.

19

Proportion of heartwood and sapwood in Scots pine (Pinus sylvestris L.) stems grown in different site conditions

67%

Jakubowski M., Kaluzinski D., Tomczak A., Jelonek T.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

|

2015

|

tom 92

20

Axial and radial variation of sapwood and heartwood in stems of common oak (Quercus robur L.) and selected biometric traits of trees and site fertility

59%

Pazdrowski W., Szymanski M., Kazmierczak K., Nawrot M., Manka K.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2009

|

tom 08

|

nr 2

The study is an attempt to determine variation in the proportions of sapwood and heartwood in the radial and axial sections in stems of common oak (Quercus robur L.), representing the main tree stand (according to Kraft biosocial classification), age classes V (81-100 years) and VI (101-120 years), growing in the fresh mixed forest and fresh forest sites. Sample trees were selected according to Urich I method from four plots (of 1 ha each). For each model tree its crown projection area was determined. After felling all necessary biometric traits of tree stem and live crown were measured. Stems were divided into 2-metre sections, from which centres discs were cut in order to determine selected wood macrostructure parameters and volumes of sapwood rings and heartwood cylinders. Additional discs were cut from breast height and kerf planes of trees. When analyzing results for individual discs and trees arithmetic means of widths (or volumes) of studied wood zones were used. During the study the irregularities were determined of sapwood and heartwood zones in stems. Strong and plus interrelations were found between crown volume and crown projection area (as area of cylinder external surface) and sapwood area at the cross stem section, although some of the correlation coefficients were not significant. Large variation was observed in the proportions of volumes of sapwood and heartwood in individual Kraft’s biosocial classes. Differences were also found in sapwood and heartwood radial share between age classes, and rather small differences between forest site types.

Ograniczanie wyników

Determination of the compressive strength parallel to the grain of resinous yellow pine heartwood

Circumferential variation in heartwood in stands of black locust (Robinia pseudoacacia L.)

Decay of oak heartwood by selected fungi species

Comparative study of qualitative structure the beech logs sorted by the old and the new European standard EN 1316-1

The chemical composition of oak wood after prolonged influence of variable weather conditions

Proportion of sapwood and heartwood in stems of European Larch (Larix decidua Mill.) origin from provenances experimental plot

Effect of site fertility upon formation of heartwood in timber of Scots pine [Pinus sylvestris L.]

Effect of site fertility upon formation of heartwood in timber of Scots pine [Pinus sylvestris L.]

Percentage share of sapwood and heartwood in stems of European larch (Larix decidua Mill.) representing II and III class of age grown in different forest site types, representing main tree stand at Kraft biosocial classification

Decay of the heartwood in lower and upper trunk of Pinus sylvestris by Porodaedalea pini

Influence of knots on the content of chemical substances in knot adjacent oak wood (Quercus petraea Liebl.)

Variability of the share of heartwood on the stem cross-section of Douglas fir (Pseudotsuga menziesii var. viridis Franco) in Poland

Influence of thermal modification of Scots pine wood (Pinus sylvestris L.) on color changes

Investigation of iron content in fossil oak from a medieval settlement in Plonsk

Axial and radial variation in the proportions of sapwood and heartwood in stems of common oak [Quercus robur L.] depending on site type, age class and social class of tree position

Radial and axial variability of the proportion of sapwood and heartwood in stems of Scots pine trees (Pinus sylvestris L.) developed in conditions of former farmlands and typical forest sites

Investigation of round Scots pine wood WC01 class using X-ray computer tomography

Emission of volatile organic compounds from cross section of pine wood (Pinus sylvestris L.)

Proportion of heartwood and sapwood in Scots pine (Pinus sylvestris L.) stems grown in different site conditions

Axial and radial variation of sapwood and heartwood in stems of common oak (Quercus robur L.) and selected biometric traits of trees and site fertility