Wyniki wyszukiwania - Biblioteka Nauki

1

Zagęszczenie i dynamika procesu wydzielania drzew w młodocianych drzewostanach brzozowych na gruntach porolnych

100%

Socha J. , Zasada M.

Sylwan

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2014

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tom 158

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nr 05

EN

The study describes allometric relationships between stand density and tree dimensions in birch stands on post−agricultural lands. The research material consisted of measurements carried out on 120 sample plots located in birch stands on post−agricultural lands of Central Poland. The investigated relationship was analyzed using ordinary least squares (OLS), dynamical formulation of allometric function (DFA), sto− chastic frontier production function (SFF) as well as quantile regression (QR) methods. Similar effects of modeling maximum density were obtained as a result of applying FFP and QR methods with 0.9 quan− tile. SFF was found to be the most adequate method for modeling maximum density.

2

Określanie miąższości i zagęszczenia drzew w drzewostanach centralnej Polski na podstawie danych lotniczego skanowania laserowego w dwufazowej metodzie inwentaryzacji zasobów drzewnych

84%

Miscicki S. , Sterenczak K.

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nr 2

3

Określenie zagęszczenia drzewostanów z wykorzystaniem danych z lotniczego skanowania laserowego

84%

Sterenczak K.

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nr 08

EN

Airborne laser scanning (ALS) technology allows collecting data describing top forest layer in a very accurate way. This provides a possibility to generate crown height models (CHM) with resolution in which single tree crowns can be detected. In presented study highly automatic algorithm for single tree detection is presented. FALCON II ALS acquired data in Forest Experimental Station in Rogów (central Poland). Data used for algorithm accuracy evaluation were acquired by measuring sample plots on VSD photogrammetric station. CHM with the resolution of 0.5 m has been used in the presented research. Algorithm, in automatic or semi− −automatic way, defines single crowns. Each of the end segments was additionally processed for correctly defined size and area of the crown projection. Received accuracy of correctly detected trees was 69% for all samples (71% for pine stands and 61% mixed stands) in automatic method and 74% (78% and 65% respectively) in semi−automatic method.

4

Wpływ zagęszczenia na wzrost i jakość hodowlaną sosny w odnowieniach naturalnych

67%

Tarasiuk S. , Kopec K. , Drozdowski S.

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nr 12

EN

The paper was aimed at determination of the effect of different tree density in the naturally regenerated monotypic and even aged young Scots pine stands growing in the fresh coniferous or mixed fresh coniferous forest sites on their further development. Research was carried out in Nowa Dęba Forest District (south−eastern Poland). A total of 12 research plots (160×40 m) were established in the selected stands. Plots were divided into 4 equal square pieces (40×40 m), where different methods of tending were applied (variant A – control, variant B – thinned, leaving 16 thousand trees/ha, variant C – thinned, leaving 10 thousand trees/ha, variant D – thinned, leaving 6 thousand trees/ha). The thinning was carried out in April 2007. In subsequent years (2007−2010), selected elements of stand structure like: height, height increment, density and damage resulting from abiotic and biotic factors were determined. Tree density significantly influenced both height increment and qualitative (tree shape) characteristics of naturally regenerated young pine trees. In the course of early thinnings, the number of trees needs to be reduced approximately down to the 10−16 th. stems/ha in the first stage of growth (seedlings), and further down to about 6 th./ha in the coppice stage. Such density enhances the chance of good growth and silvicultural quality of the stand. Noteworthy, even the heavy thinning does not significantly impact the actual proportion of both biotic (e.g. ungulate browsing) and abiotic (e.g. heavy snow) damage in the young naturally regenerated Scots pine forest stands.

5

Wpływ sposobu postępowania z pozostałościami zrębowymi i przygotowania gleby na zrębie na wzrost sosny zwyczajnej (Pinus sylvestris L.) w 6-letniej uprawie

67%

Zybura H. , Aleksandrowicz-Trzcinska M. , Drozdowski S. , Wolczyk Z.

Sylwan

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2016

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tom 160

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nr 04

EN

Different methods of logging slash management (LSM) and methods of soil preparation (MSP) can create different conditions for the growth of forest trees. This occurs through variation in soil aeration, tree nutrition or microbial conditions. These factors are modified by climate, soil fertility, treats from insects or fungal pathogens and renewed species. The aim of this study was to compare effects of three LSM methods: 1) crushing and mixing with the soil by Mery Crusher, 2) chopping and leaving on the soil surface, and 3) removal from the clear−cut, and three MSP: 1) double−mouldboard forest plough LPz−75, 2) active plough U−162, and 3) forest mill FAO−FAR FV 4088 on biometric parameters, density and survival of six−years old Scots pine seedlings. Field research was conducted in Narol Forest District (south−eastern Poland). The soil in the study area was classified as brown podzolic, formed on loose sands with typical mor humus.The experiment was established by planting 10 000 one−year−old pine seedlings per hectare, after clear cut and followed by a two−factor block design consisting of nine variants distinguished on the basis of LSM and MSP randomly assigned to each of the three blocks. Tree height and root collar diameter were measured three times, at the end of 1st, 3rd and 6th growing season. The results showed no statistically significant differences in the size of the analyzed parameters of planted seedlings. Seedlings in the variant with site preparation by crusher and forest mill were slightly higher and thicker. This indicates the better trophic conditions in that variant. LSM did not affect either seedlings density or their survival. A slightly higher survival rate and tree density occurred in variants with crusher regardless of soil preparation method. It follows that, all presented experimental variants give similar results. Therefore, selection of the most appropriate methods of site and soil preparation should primarily respect ecological and economic indicators, and such local factors as microclimate, mainly precipitation, site fertility and threats from pests and fungal diseases.

6

Dynamika naturalnych faz rozwojowych drzewostanów w Białowieskim Parku Narodowym

67%

Miscicki S.

Sylwan

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2012

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tom 156

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nr 08

7

Ocena naturalnego i sztucznego odnowienia drzewostanów sosnowych Pinus sylvestris L. w Nadleśnictwie Nowa Dęba

67%

Dlugosiewicz J. , Zajac S. , Wysocka-Fijorek E.

Leśne Prace Badawcze

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2019

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tom 80

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nr 2

8

Zmiany wybranych cech taksacyjnych drzewostanow Gorczanskiego Parku Narodowego w okresie 1992-2002 na tle oceny naturalnosci lasow gorczanskich z 1932 roku

67%

Chwistek k.

Roczniki Bieszczadzkie

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2008

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tom 16

125-144

9

Zależność wybranych cech drzewostanów od położenia nad poziomem morza na przykładzie Parku Narodowego Gór Stołowych

67%

Miscicki S. , Szneidrowski M.

Sylwan

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2017

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tom 161

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nr 02

EN

The elevation is used to illustrate the differences in the structure and growth of mountain forests. The aim of the study was to determine (1) whether the characteristics used to describe the condition and structure of forest stands under protection status (volume of merchantable timber, tree density, total height of trees in the regeneration layer, volume of dead stems, current annual volume increment, volume of dead trees, periodic changes in standing volume) change at the same rate along with the elevation, and (2) whether in mountains without upper montane zone, the values of the selected characteristics of stands located in the highest elevation zone decrease at a low rate with elevation and are comparable to the stands at the same elevation in higher mountains ranges. The study was located at an elevation of 400−909 m a.s.l. in the Stołowe Mountains National Park (PNGS; SW Poland). We used data from the measurements performed in 2009 and 2014 on 358 permanent sample plots. Plots were assigned to one of five elevation zones of 100 m a.s.l. We assumed that the characteristic value decreased with the increase in the elevation, and that such change was the same for all stand characteristics. This hypothesis was verified using the ANOVA for the repeated samples. The calculations were based on standardized values of the characteristics measured on individual sample plots. The higher above sea level the plot was located, the greater share of spruce in the stand (fig. 1). The standing volume (fig. 2), trees density (fig. 3) and current annual volume increment (fig. 6) decreased with elevation, while the volume of dead stems (fig. 4) increased. The net changes in standing volume (fig. 8) were the smallest in the stands located at the lowest and at the highest zone (400−499 and 800−909 m a.s.l.). No significant relationship was found between the total height of trees in the regeneration layer (fig. 5) or the volume of dead trees in the period 2009−2014 (fig. 7) and the elevation. Individual characteristics differed in the rate of changes of their values with elevation (fig. 9). The structure of stands growing at the highest elevation was the most variable. These stands were rather a substitute for the upper montane zone forests. The rate of the observed decrease of the volume of merchantable timber, tree density and current volume increment in the stands of PNGS was higher than in other forests in the Polish mountains.

10

Wkraczanie czeremchy amerykańskiej Padus serotina (Ehrh.) Borkh. do olsów i łęgów olszowo-jesionowych

67%

Dyderski M. K. , Jagodziński A. M.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2015

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tom 14

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nr 2

11

Wieloletnia dynamika drzewostanów na dawnym zrębie kulisowym w warunkach ochrony ścisłej (Łysica, Góry Świętokrzyskie)

59%

Brzeziecki B. , Janicki S. , Wiech M.

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nr 08

12

Dynamika procesu przebudowy drzewostanów górskich na gruntach porolnych

59%

Zieba S. , Banas J. , Bujoczek L. , Kozuch A. , Slupska A.

Acta Agraria et Silvestria. Series Silvestris

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2016

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tom 54

13

Wpływ intensywności cięć na postać i strukturę wybranych różnowiekowych drzewostanów jodłowych w Leśnym Zakładzie Doświadczalnym w Krynicy

51%

Banas J. , Zieba S. , Bujoczek L. , Polak M. , Zygmunt R.

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tom 53

14

Wieloletnia dynamika starodrzewów w zagospodarowanej części Puszczy Białowieskiej: gatunki ekspansywne i ustępujące

51%

Drozdowski S. , Brzeziecki B. , Zybura H. , Zybura B. , Gawron L. , Buraczyk W. , Zajaczkowski J. , Bolibok L. , Szeligowski H. , Bielak K. , Widawska Z.

Sylwan

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2012

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tom 156

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nr 09