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1

Feasibility of dbh-based regression model in determining the age of streetside trees

100%
Lukaszkiewicz J.
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
|
2009
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tom 30
2

Quantification of individual tree competition index taking Chinese-fir plantations in subtropical low hilly area as an example

100%
Zhang Y., Deng X., Huang Y., Li Y., Xiang W., Yan W.
Polish Journal of Ecology
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2019
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tom 67
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nr 1
Competition among trees is a fundamental interaction process within plant community, which is the theoretical basis of thinning. Plant competitive intensity is generally measured using a competition index (CI) that can be classified into two major categories: distance-independent and distance-dependent. The current study used Cunninghamia lanceolata (Lamb.) Hook as the test subject and used Hegyi's CI (distance-dependent), to quantify individual CI and their relationship with tree diameter at breast height (DBH). Five different criteria were used to select potential competitors for the calculation of CI. Seven basic linear and nonlinear mathematical functions were used to test and quantify the relationships between DBH of the target tree and the individual CI. Results showed that individual CI was negatively correlated with target tree DBH: as DBH increased, competition intensity weakened. The adjusted R² with five different criteria of selection competitors simulated by seven functions ranged from 0.30 to 0.82. Considering the root mean square error (RMSE), P-value, and adjusted-R², our results suggested that the best model to simulate the relationship between individual CI and focal tree DBH was power function (CI = 43.98 × DBH⁻¹‧⁰⁸, adjusted R² = 0.81) and with the Voronoi diagram method as the criteria for selecting competitors. These results can demonstrate a clearer understanding of the spatial structure of forests, and can be used to guide the selection of thinning trees in the process of thinning practice.
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Basic density of Scots pine wood-relationships between values calculated at different heights of the trunk

100%
Tomczak A., Jelonek T., Pazdrowski W.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
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tom 84
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Population structure and regeneration status of most abundant medicinal woody plants in Mabira Central Forest Reserve management zones

100%
Tumuhe C. L., Mwine R. N., Manana S.
Environment, Earth and Ecology
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2018
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tom 2
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nr 1
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Bending strength of Scots pine wood-relationships between values calculated at different height of the trunk

100%
Tomczak A., Jelonek T., Pazdrowski W.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 84
6

Determining the age of alley trees with the dbh-height-based multi-factoral model

100%
Lukaszkiewicz J.
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
|
2010
|
tom 31
7

Temporal and spatial patterns of aboveground biomass and its driving forces in a subtropical forest : a case study

100%
Ma L., Li W., Shi N., Fu S., Lian J., Ye W.
Polish Journal of Ecology
|
2019
|
tom 67
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nr 2
8

Changes in the DBH structure of Norway spruce [Picea abies [L.] Karst.] in the experimental trial of IUFRO 1972 series in Siemianice Experimental Forest District

100%
Barzdajn W., Kowalkowski W.
Forestry
|
2001
|
tom 04
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Juvenile wood volume and its proportion to stem volume vs. selected biometric features of Scots pine [Pinus sylvestris L.] trees

100%
Pazdrowski W., Tomczak A., Kupczyk G., Jelonek T.
Acta Societatis Botanicorum Poloniae
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2005
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tom 74
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nr 4
The aim of the study was to determine whether there is a correlation between breast height diameter, tree height and stem total volume of Scots pines, on the one hand, and volume and proportion of juvenile wood, on the other. The investigations comprised pure pine stands of the IInd, IIIrd, IVth and Vth age classes developed in conditions of fresh mixed coniferous forest. A distinct curvilinear correlation was found between volume and proportion of juvenile wood in tree stems and breast height diameter, height and stem total volume. Because of high values of determination coefficients (R2), which characterised the above-mentioned correlations, it seems appropriate to use these regularities to assess the quality of the timber raw material regarding the proportions of its volume and juvenile wood in stems of Scots pine trees.
10

Succession of tree species on drained bogs in ‘Brzozowe Bagno kolo Czaplinka’ nature reserve, NW Poland

80%
Jagodzinski A. M., Dyderski M. K., Horodecki P., Rawlik K., Gdula A. K.
Polish Journal of Ecology
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2018
|
tom 66
|
nr 4
Succession of woody species on bogs is a process limited by high groundwater table. In the case of drainage, this limiting factor becomes suppressed and succession may accelerate. The aim of the study was to assess the development of tree stands on a raised bog influenced by drainage and wild fire and to assess the dynamics of woody species encroachment. The study was conducted in the ‘Brzozowe Bagno koło Czaplinka’ nature reserve in NW Poland, where the originally unforested peat bog was influenced by peat harvesting, drainage and fire over 100 years. The diameter at breast height of tree species and natural regeneration were assessed. Six types of tree stands were distinguished: open bog, bog forest with Pinus sylvestris, early-, mid- and late-successional bog forest with Betula pubescens and pioneer forest with Populus tremula, which occurred in the post-fire sites. After ca 100 years of human activity on an unforested peat bog, dense forest emerged on almost all of the study area. Drainage and wildfire influenced tree stand structure. The course of succession most probably goes from open bog to pine bog forest and early-, mid- and late-successional birch forests. Regeneration of B. pubescens is a crucial phase of woody species succession, because this species creates suitable conditions for growth of late-successional species.
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