Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Wpływ warunków siedliskowych, wielkości gniazda oraz położenia w jego obrębie na wysokość 6- i 10-letnich dębów szypułkowych (Quercus robur L.)

100%

Bolibok L., Szeligowski H.

Sylwan

|

2011

|

tom 155

|

nr 02

2

Sklad gatunkowy dendroflory uksztaltowanej pod wplywem gospodarki lesnej na siedliskach boru mieszanego swiezego i lasu mieszanego swiezego w Nadlesnictwie Doswiadczalnym Zielonka

100%

Danielewicz W., Strzelinski P.

Prace Komisji Nauk Rolniczych i Komisji Nauk Leśnych. Poznańskie Towarzystwo Przyjaciół Nauk

|

1994

|

tom 78

43-51

3

Cechy jakościowe podrostów dębowych rosnących pod osłoną drzewostanów sosnowych

100%

Aleksandrowicz-Trzcinska M., Pewniak B., Zybura H.

Sylwan

|

2018

|

tom 162

|

nr 04

Scots pine stands in central Poland are now seen to be experiencing dynamic development of lower layers formed by oaks. The under−canopy natural renewal taking place in this way is sometimes characterised by good silvicultural quality, and could therefore be taken advantage of in the process of stand conversion. The study assess the quality of existing undergrowth layers of oak present in older stands of Scots pine, most especially from the point of view of their suitability for subjection to further silvicultural measures. The research material was collected in 10 objects where site type was classified as mesic mixed coniferous site type (BMśw) as well as in 11 ones with mesic mixed broadleaved forest (LMśw) site type. In each site type, 2 or 3 stands were selected to typify undergrowth layers aged 15, 20, 25 or 30 years. Assessment of oak undergrowth trees was made on the basis of 4−point scale in case of trunk or crown quality and vitality, and on a 3−point scale when vitality and the development trend were concerned. Next we selected the trees with future potential characterised by the highest quality from the point of view of all studied traits. A further determination concerned the influence on the traits in these best trees of the oak understorey that was exerted by biometric features of both the sheltering Scots pine stand and the undergrowth itself. The studied undergrowth oaks are of either very good or good quality. Around 90% of these young trees could be assigned to 1st or 2nd quality class with the respect of all of analysed traits. Furthermore, fertility of the site type was found not to have any influence on the quality of the young oaks. However, where the number of trees identified as having future potential is concerned, influence was demonstrated for density of trees in both stand and the undergrowth layer, as well as their height, breast−height diameter and basal area. Oaks forming the lower layer beneath Scots pine stands are thus characterised by good quality and growth trends, to the extent that this suggests allowing further growth to take place, with inclusion within the main stand or next generation.

4

Biochemiczna aktywność gleb różnych siedlisk leśnych

100%

Olszowska G.

Sylwan

|

2016

|

tom 160

|

nr 08

The aim of the study was to determine the enzymatic activity and chemical properties of soil in selected stands of different age classes on two forest site types: fresh mixed coniferous forest (BMśw) and fresh mixed deciduous forest (LMśw). The investigations were carried out in Nowe Ramuki Forest District in 2013−2015 located in the central part of Warmińsko−Mazurskie administration district Poland. In organic and humus horizons following parameters were described: acidity in 1M KCL, content of nitrogen, carbon and exchangeable alkaline cations (Na+, K+, Ca2+ and Mg2+) as well as hydrolytic acidity. Enzymatic investigation included the measurements of urease, asparaginase, acid phosphatase and dehydrogenase activity. Content of C and N, sum of base cations (S), hydrolytic acidity (Hh), cation exchange capacity (PWK), base saturation percentage were significantly higher in organic than humus horizon. Enzymatic activity was connected with the content of organic matter, what resulted in higher activity in organic than humus horizon independently of site type and stand age. The concentration of organic carbon (C), nitrogen, C/N ratio, hydrolytic acidity and cation exchange capacity was higher on BMśw than LMśw site type. Activity of urease, acid phosphatase and dehydrogenase was lower in soils of LMśw than BMśw site type. Lower enzymatic activity may suggest lower intensity of decaying process of organic matter in these soils. Significant correlations between enzymes and chemical soil parameters were found. Significant correlation between enzymatic activity and soil chemical properties shows that biochemical parameters can be used as indexes of their productivity. Investigation of biochemical reaction intensity can be complement to soil chemical studies usually used in forestry.

5

Przyrost radialny jodły pospolitej (Abies alba Mill.) w Puszczy Iłżeckiej

80%

Bis R., Dobrowolska D.

Leśne Prace Badawcze

|

2012

|

tom 73

|

nr 3

6

Przestrzen pojedynczego drzewa w drzewostanie panujacym w zaleznosci od wieku oraz typu siedliskowego lasu na przykladzie modrzewia [Larix decidua Mill.]

80%

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

Sylwan

|

2010

|

tom 154

|

nr 11

764-772

7

On the occurence of sapwood and heartwood in stems of scots pines grown in conditions of mixed fresh broadleaved forest

80%

Pazdrowski W., Splawa-Neyman S.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

1999

|

tom 30

69-78

8

Cechy biometryczne podrostów dębowych pochodzenia naturalnego rosnących pod osłoną drzewostanów sosnowych

80%

Zybura H., Pewniak B.

Sylwan

|

2017

|

tom 161

|

nr 06

The objectives of the study was to investigate and compare the characteristics of oak advance−growth of various age present under Scots pine canopy and growing on the mesic mixed coniferous (BMśw) or mesic mixed deciduous (LMśw) forest site types. The study was conducted in Kolumna Forest District (central Poland) in 21 Scots pine stands ca. 90 years of age, and with a well−developed oak advance−growth. The study sites were divided into 4 groups depending on the age of oak: 15, 20, 25 or 30−years−old. The empirical data concerned trees frequency (per unit area), average breast height diameter, height and basal area. The dependence of these characteristics on type of the main stand and advance−growth was then determined by statistical analysis. Above all, an attempt was made to determine the impact of forest site type conditions on the characteristics of oaks advance−growth. Results show that oaks are present at the density that makes the possibility of the advance−growth development into the stand real. Trees in the upper storey are found to exert a great influence on the silvicultural value of advance−growth trees. In particular, the density of trees in the main stand is a feature found to affect greatly the layer of oak advance−growth.

9

Macrostructure of scots pine timber from unripe forest stands grown in conditions of fresh mixed broadleaved forest

80%

Pazdrowski W., Splawa-Neyman S.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

1999

|

tom 30

89-94

10

Wpływ masowego zamierania świerka w drzewostanach Białowieskiego Parku Narodowego na odnowienie naturalne dębu

80%

Bobiec A., Bobiec M.

Sylwan

|

2012

|

tom 156

|

nr 04

11

Siedliska kwasnej dabrowy trzcinnikowej [Calamagrostio arundinaceae-Quercetum petraeae] w srodkowej Wielkopolsce

51%

Lasota J., Karp M., Biskup S.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

|

2005

|

tom 04

|

nr 1

23-39

Ograniczanie wyników

Wpływ warunków siedliskowych, wielkości gniazda oraz położenia w jego obrębie na wysokość 6- i 10-letnich dębów szypułkowych (Quercus robur L.)

Sklad gatunkowy dendroflory uksztaltowanej pod wplywem gospodarki lesnej na siedliskach boru mieszanego swiezego i lasu mieszanego swiezego w Nadlesnictwie Doswiadczalnym Zielonka

Cechy jakościowe podrostów dębowych rosnących pod osłoną drzewostanów sosnowych

Biochemiczna aktywność gleb różnych siedlisk leśnych

Przyrost radialny jodły pospolitej (Abies alba Mill.) w Puszczy Iłżeckiej

Przestrzen pojedynczego drzewa w drzewostanie panujacym w zaleznosci od wieku oraz typu siedliskowego lasu na przykladzie modrzewia [Larix decidua Mill.]

On the occurence of sapwood and heartwood in stems of scots pines grown in conditions of mixed fresh broadleaved forest

Cechy biometryczne podrostów dębowych pochodzenia naturalnego rosnących pod osłoną drzewostanów sosnowych

Macrostructure of scots pine timber from unripe forest stands grown in conditions of fresh mixed broadleaved forest

Wpływ masowego zamierania świerka w drzewostanach Białowieskiego Parku Narodowego na odnowienie naturalne dębu

Siedliska kwasnej dabrowy trzcinnikowej [Calamagrostio arundinaceae-Quercetum petraeae] w srodkowej Wielkopolsce