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Wyszukujesz frazę "slope aspect" wg kryterium: Wszystkie pola


Wyświetlanie 1-2 z 2
Tytuł:
Sukcesja wtórna drzew w krajobrazie wydmowym stałej powierzchni badawczej Glinki w świetle analizy GIS
Secondary succession of trees in the dune landscape of the "Glinki" long-term research area - analysis with GIS
Autorzy:
Sewerniak, P.
Mendyk, L.
Powiązania:
https://bibliotekanauki.pl/articles/1311058.pdf
Data publikacji:
2015
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
poligony wojskowe
stale powierzchnie obserwacyjne
wydmy
sukcesja roslin
drzewa
rozmieszczenie przestrzenne
analiza przestrzenna
relief
slope aspect
Podzols
military area
spatial analysis
Opis:
The aim of the study was to present the main characteristics of the “Glinki” research area together with results of the first measurements on tree number, density, distribution and species composition carried out in 2011. The research was conducted in a free-of-forest management part of the Toruń military area which is located in one of the biggest inland dune fields of Europe. The “Glinki” research area was established in 2011 and consists of two plots (together 26.3 ha), which are in close proximity to each other. After the last fire in 1991, secondary succession has been the main factor shaping vegetation on both plots. For every plot, the location of all trees of at least 1 m height (560 in plot I and 292 in plot II) was determined. These measurements were subjected to spatial analysis in ArcGIS 9.3 with special emphasis on the exposure of the dune slopes. The main tree species on both plots were Scots pine, Pinus sylvestris, and birch, Betula pendula, (82 % and 17 % of all trees respectively). Tree density 20 years after the last fire was very low (32 trees/ha), which mainly resulted from the lack of a sufficient source of seeds in the close vicinity of the plots during the first years after the fire. We also found that tree distribution was related to the main direction of seed inflow and land relief. Tree density was much higher on dune slopes with a northern exposure when compared to other slope exposures, which resulted from different site conditions on the different slopes.
Źródło:
Leśne Prace Badawcze; 2015, 76, 2; 122-128
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ rzeźby terenu na bonitację i cechy wzrostowe drzewostanów sosnowych na wydmach Kotliny Toruńskiej
Impact of land relief on site index and growth parameters of Scots pine stands on inland dunes in the Torun Basin
Autorzy:
Sewerniak, P.
Powiązania:
https://bibliotekanauki.pl/articles/989617.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Kotlina Torunska
rzezba terenu
ekspozycja terenu
drzewostany sosnowe
sosna zwyczajna
Pinus sylvestris
wzrost roslin
wysokosc drzew
piersnice drzew
smuklosc drzew
bonitacja drzewostanow
topography
pinus sylvestris
slope aspect
tree growth
forest site
soil
inland dunes
Opis:
The aim of the study was to determine the impact of land relief on site index and growth parameters (height, diameter, slenderness) of Scots pine (Pinus sylvestris) stands on inland dunes in the Toruń Basin (N Poland). The study was conducted on 150 plots situated on north− and south−facing dune slopes (54 pairs of twin plots) as well as in intra−dune depressions (42 plots). Height and diameter of ten the thickest pines per 0.1 hectare was measured, and next site index as a potential height of a stand at the age of 100 years was calculated. As the results of the used equation, site index was strongly (R²=0.58) negatively biased to age, so the bias was removed using an elaborated regression model. For stands older than ca. 20 years, the clear higher site index values as well as higher heights and diameters were found for intra−dune depressions than for slopes of the two studied aspects. This was explained by the occurrence of much more fertile and moister soils in depressions. The only age class for which the advantage of site index and growth parameters was not stated for depressions was the youngest class (≤20 years old). This was likely caused by the competitive impact on young pines of Calamagrostis epigejos which prefers intra−dune depressions on inland dunes and forms in forest floor usually dense cover in this position. Impact of contrasting slope aspect was clearly related in the study to age of a stand. For the youngest studied age class both site index values as well as heights and diameters were lower on north− than on south−facing slopes. This was explained by the effect of weeds which form more dense cover on slopes of this aspect than on sunny slopes. For older stands; however higher site index values as well as heights and diameters were revealed for north−facing slopes, due to pines likely took advantage of higher moisture of soils occurring in this place. With reference to slenderness, regardless stand age the parameter was regularly the highest for north− than both for south−facing slopes and depressions. Because of the revealed distinct higher productivity of intra−dune depressions in normally dry and poor in nutrients dune landscape, it could be reasonable to use the depressions to introduce admixtures of broadleaved tree species into pine monocultures on inland dunes.
Źródło:
Sylwan; 2016, 160, 08; 647-655
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
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