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Wyświetlanie 1-2 z 2
Tytuł:
Wpływ małych śródleśnych zbiorników wodnych na przyrost radialny drzew
Impact of small mid-forest water reservoirs on trees radial increment
Autorzy:
Czyżyk, K.
Porter, B.
Powiązania:
https://bibliotekanauki.pl/articles/986675.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
mala retencja wodna
zbiorniki srodlesne
zbiorniki wodne
oddzialywanie na srodowisko
drzewa lesne
przyrost drzew
przyrosty radialne
small retention
radial increment
Opis:
The aim of the study was to determine the effect of small forest water reservoirs on the radial increment of Scots pine and Norway spruce. We selected four small water reservoirs that were reconstructed in autumn 2006 in the Maskulińskie Forest District (northern Poland). Around each reservoir we placed transects according to the cardinal directions. At those transects we set up 10×10 m sample plots at different distances from the edge of the water reservoirs. On the each sample plot we made simplified phytosociological releve and set the type, subtype, and variety of soil. The impact of the water reservoirs on the radial increment was determined for Scots pine and Norway spruce growing on transects. Conducted research showed that the examined species stronger reacted to the water stored in the reservoirs by diameter increase in the initial two or three years after the reservoir reconstruction. The increment of Scots pine growing near to edge of the water reservoirs (up to 20 m) was reduced. In contrast, there was no significant impact of environmental features or weather conditions on radial increment of the analysed species.
Źródło:
Sylwan; 2018, 162, 07; 539-546
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena ekonomiczna retencyjnych właściwości lasu
Economic valuation of the water storage capacity of forests
Autorzy:
Tyszka, J.
Powiązania:
https://bibliotekanauki.pl/articles/989798.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy
retencja wodna
mala retencja wodna
ocena ekonomiczna
forest
water storage
price of water
valuation of the water−storage function
Opis:
The article attempts to calculate the economic value of the natural water storage capacity of forests. The impact of forests on the volume of the river runoff and on the delay of the water cycle from the precipitation to the runoff was an indicative measure of storage capacity of the forest. Data from long−term research aimed at determining forest−water interactions in small catchments were used. Four weakly−correlated parameters of runoff characteristics were determined, reflecting the scale of retention capacities of forested areas. These parameters included mean annual runoff (HR), coefficient of the annual runoff irregularity of (HRmax/HRmin), summer to winter half−year runoff ratio (HL/HZ) and the volume of the discharge (Wq/Sq). Equations were developed interpreting the range of changes of the parameters with the increase of forest cover from 0 to 100% (fig. 1−3), and the volume of water stored by the forest per 1% of the forest cover per year was calculated. Using simplifying assumptions, the total volume of water stored per hectare of the forest in the average year was calculated to 9.05 m³. The unit cost of 1 m³ of water was determined on the basis of the lowest price which the State Forests (in the territory of the Garwolin Forest District) spent to increase the volume of the water stored in small reservoirs. No difference was made between natural and artificial water storage in terms of utility. According to such simplified calculations, the natural storage capacity of forests was estimated at 1,089 PLN per year. Apart from the water storage function, forests provide other benefits resulting from a wide range of hydrological, water−protecting effects. Water resources safeguard, inter alia, the sustainable development of forests: affect the climatic conditions, reduce the level of environmental contamination. These functions can be intensified through the use of appropriate methods of forest management.
Źródło:
Sylwan; 2015, 159, 06; 483-490
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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