Wyniki wyszukiwania

1

Einfluss der Kaffeebraune von Tannenkernholz auf die Qualitat des Holzrohstoffs

100%

Paschalis P., Lotocka Z.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

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1992

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tom 43

2

Ultraschalluntersuchung der Qualitat von Rundholz

88%

Bajkowski B., Cyrankowski M., Osipiuk J.

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

|

2013

|

tom 81

3

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Field study of thermomodified Populus nigra wood in contact with the ground

75%

Fojutowski A., Kropacz A., Noskowiak A.

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

|

2018

|

tom 103

4

Ovality on trees adjacent to skid road

75%

Karaszewski Z., Giefing D. F., Lacka A., Noskowiak A.

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

|

2014

|

tom 86

5

Strip road impact on selected wood defects of Norway spruce (Picea abies (L.) H. Karst)

75%

Bembenek M., Giefing D. F., Karaszewski Z., Lacka A., Mederski P. S.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

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2013

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tom 56

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nr 190

Creating strip roads in second age class stands is an indispensible operation for carrying out thinning. It is especially important in places where there is an intention to do a first thinning using mechanised thinning operations. Felling trees to create strip roads results in altered conditions for the tree growth of neighbouring trees.In particular, this is due to an increase in exposure to sunlight. This can lead to changes in the growth of trees and consequently changes in the morphology of the trunk and the development of defects. The objective of this paper was to analyse the frequency of the presence of particular defects in the structure and shape of spruce ina five-year period after the creation of a strip road. The research was carried out in an artificially regenerated spruce stand within the spruce’s natural, northern habitat in Poland. A 34-year-old stand underwent a systematic thinning scheme which involved the removal of every eighth tree row. The analysis was carried out on trees growing both adjacent to the strip roads (which had a greater growing area around them and greater access to sunlight) as well as trees from further within the stand. Diameter growth was taken in three places: at breast height, in the middle of the trunk between breast height and the base of the crown, as well as at the base of the crown. The average incremental growth, pith eccentricity taper and ovality were calculated. No statistically significant difference in defects between the trees growing by the strip road and those growing further in the stand was observed. Greater taper on mid-tree logs in comparison to butt logs was observed. Insignificant changes in the morphology of the trunks, supports the validity of cutting strip roads in second age class stands.

6

Pinewood quality potential

75%

Wieruszewski M., Karkoszka I., Hruzik G. J., Marcinkowska A., Krystofiak T.

Intercathedra

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2013

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tom 29

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nr 1

The scope of the article was to determine quality ratios based on the selected largesize and laboratory samples of coniferous pinewood obtained from the central part of Poland (Wieruszowski District), in order to evaluate the usefulness of those elements for wooden constructions. Physical and mechanical parameters have been determined which facilitated defining quality and endurance ratios of semi-finished products.

7

Spoil heaps - a new chance, not only for trees

63%

Kvietkova M., Gasparik M., Slavik M., Ruman D., Cafourek J.

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

|

2015

|

tom 92

8

Value of merchantable timber in Scots pine stands of different densities

63%

Bembenek M., Karaszewski Z., Kondracki K., Lacka A., Mederski P. S., Skorupski M., Strzelinski P., Sulkowski S., Wegiel A.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

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2014

|

tom 57

|

nr 192

Differences in the intensity of silvicultural treatments, as well as natural tree mort-ality, insect damage and fungal disease can eventually lead to variable stand density even on sites of the same quality. In addition, the bigger the initial stand density,the smaller the crown and trunk volume of single trees. The objective of theresearch was a detailed analysis of the impact of stand density on the total stand volume and value of merchantable timber. The area studied was in Drawno ForestDistrict, north-west Poland, on sites with sandy soil conditions typical for Scots pine (Pinus sylvestris L.). The total volume of merchantable roundwood wasmeasured on 20 sample plots (each covering an area of 0.5 ha) of which 19 were in 82-year-old stands and one in an 87-year-old stand. The stands were divided into three stand density groups (SDG), where the average number of trees growing per group was as follows: 547 (SDG I), 651 (SDG II) and 765 (SDG III). The volume ofa single tree was calculated using diameter (DBH) and height measurement. A qualityclassification of all 6432 tree stems was carried out in accordance with the Polish Standard. Statistical analysis did not indicate that density influenced the total timber volume of the stands studied, which was recorded as an average of 323 m3∙ha-1. However,statistically significant differences in the value of merchantable timber were observed:the highest value of 100 m3 of merchantable timber was recorded in SDG I (€ 5118.87), 6 and 12% higher than in SDGs II and III (€ 4842.09 and € 4565.80, respectively).The results obtained suggest that in the final phase (the last two age classes), pine stands growing in Polish conditions should be maintained at a lower stand density.

9

Factors affecting the timber quality of black alder (Alnus glutinosa (L.) Gaertn.)

63%

Karaszewski Z., Mederski P. S., Bembenek M., Giefing D. F., Sawicka K., Gierszewska M.

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

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2015

|

tom 89

10

Relation between heat of combustion of wood and absorbance of its MIR spectrum in 1515 (1510) cm minus 1 band

63%

Dziurzynski A.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

2009

|

tom 40

11

Wood density and static hardness interactions of English oak (Quercus robur L.) and Black locust (Robinia pseudoacacia L.)

63%

Rohanova A., Lagana R.

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

|

2012

|

tom 79

12

An attempt at appraisal of softwood quality based on coefficient of optimal structure (COS)

63%

Jakubowski M., Jelonek T.

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

|

2012

|

tom 78

13

Computertomographie im Sagewerk-Zukunft oder Gegenwart?

63%

Krzosek S., Bacher M.

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

|

2012

|

tom 78

14

Floor board quality assessment with the use of control charts

63%

Aniszewska M., Nurek T., Ciebien A.

Annals of Warsaw University of Life Sciences - SGGW. Agriculture

|

2017

|

nr 70

15

Linear relations between defect frequency and volume of beech logs

51%

Karaszewski Z., Bembenek M., Mederski P. S., Szczepanska-Alvarez A., Giefing D. F., Wegiel A.

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

|

2013

|

tom 83

16

Determination of quality parameters of spruce structural timber by prediction models

51%

Rohanova A.

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

|

2015

|

tom 90

17

Raw material factors affecting the quota of structural wood in sawmill production

51%

Wieruszewski M., Mirski R., Trocinski A.

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

|

2019

|

tom 107

18

Defects of modern wood windows - examples of expert reports

51%

Plonski J.

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

|

2014

|

tom 87

19

The effect of social position of a tree in the stand and site on wood quality of Scots pine (Pinus sylvestris L.)

51%

Jelonek T., Pazdrowski W., Tomczak A., Szaban J.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

|

2008

|

tom 11

|

nr 2

20

Coefficient of optimal structure in relation to wood density in Norway spruce (Picea abies Karst.) and pine (Pinus sylvestris L.)

51%

Jakubowski M., Jelonek T.

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

|

2012

|

tom 78

Ograniczanie wyników

Einfluss der Kaffeebraune von Tannenkernholz auf die Qualitat des Holzrohstoffs

Ultraschalluntersuchung der Qualitat von Rundholz

Field study of thermomodified Populus nigra wood in contact with the ground

Ovality on trees adjacent to skid road

Strip road impact on selected wood defects of Norway spruce (Picea abies (L.) H. Karst)

Pinewood quality potential

Spoil heaps - a new chance, not only for trees

Value of merchantable timber in Scots pine stands of different densities

Factors affecting the timber quality of black alder (Alnus glutinosa (L.) Gaertn.)

Relation between heat of combustion of wood and absorbance of its MIR spectrum in 1515 (1510) cm minus 1 band

Wood density and static hardness interactions of English oak (Quercus robur L.) and Black locust (Robinia pseudoacacia L.)

An attempt at appraisal of softwood quality based on coefficient of optimal structure (COS)

Computertomographie im Sagewerk-Zukunft oder Gegenwart?

Floor board quality assessment with the use of control charts

Linear relations between defect frequency and volume of beech logs

Determination of quality parameters of spruce structural timber by prediction models

Raw material factors affecting the quota of structural wood in sawmill production

Defects of modern wood windows - examples of expert reports

The effect of social position of a tree in the stand and site on wood quality of Scots pine (Pinus sylvestris L.)

Coefficient of optimal structure in relation to wood density in Norway spruce (Picea abies Karst.) and pine (Pinus sylvestris L.)