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Ocena fragmentacji lasów Pomorza Zachodniego pomiędzy XV a XX wiekiem

100%

Pienkowski P.

Sylwan

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2015

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tom 159

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nr 07

The paper analyzes the changes of forest fragmentation in the Western Pomerania region (NW Poland). The analysis was carried out basing on maps from 16th and 18th century as well as 1930s, when the forest cover in the studied area was the lowest. The historical area of forests was assessed on the basis on Hartnack utilization maps. The analysis of numerical maps was car− ried out in the GUIDOS program, which enables to evaluate the fragmentation of the forests through Morphological Spatial Pattern Analysis (MSPA) that describes the geometry of patches and their interconnectivity. The program calculated the forest areas classified for the seven cat− egories according to their functions in the landscape (MSPA classes). In the 15th century the forests coverage was around 52.5%. There was a significant loss of forest area between the 16th and 18th century, and in the 18th century they occupied 24.7% of the researched area. Because of the economic changes in the country that took place after the World War II, the forest area in Pomerania increased to 33.7%. It was found that changes in the forest area in the examined period resulted in a decrease in the area classified as forest interior (CORE) and an increase in the boundary area (EDGE). Taking into account the equidistant of 1 km2, the area occupied by the core patches dropped in the analysed period from 59.9% to 35.6%. At the same time the spa− tial isolation of many patches increased, which was reflected in an increase in the area classified as ‘islands' (ISLET). Their share in relation to the entire forest area increased from 4.4% to 23.6%. This could be particularly seen in the area of Pyrzycko−Stargardzka Plain and Choszczno Lakeland, where in the 1930s the so−called forest islands constituted the entire forest area of these mesoregions. The MSPA analysis enabled to specify forest patches classes, which can be useful for landscape characterization, including the patch and corridor model. The fragmenta− tion of forests can be objectively assessed using GUIDOS and it can make the output results obtained in GIS programs complete.

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Drzewostany przejęte z Państwowego Funduszu Ziemi – stan i problemy zagospodarowania

84%

Kedziora W., Orzechowski M., Wojcik R., Wrzosek E., Borecki T.

Sylwan

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2019

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tom 163

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nr 08

In this paper, we present problems with the management of the forests acquired by the State Forests from the State Land Fund. This was particularly an issue in forest districts with a significant share of private forests, e.g. eastern part of Poland. The problem becomes more and more valid because of the latest amendment of the Forest Act in 2016. It gives the State Forests the right of the first purchase of private forests attributed to sale. They may receive forest stands that will generate specific economic problems related to care, conservation, felling maintenance, etc. These are mostly stands with typical features of private forests, resulting from abandoning economic operations, selective acquisition, as well as from the size, shape and neighbourhood of the plots. This study presents the characteristics of almost 2,000 tree stands acquired from the State Land Fund between 1992−2016 by the Siedlce Forest District (SFD), which is a part of the Regional Directorate of the State Forests in Warsaw. SFD has low forest cover (18%), a strong fragmentation of forest complexes and a very large share of private forests (over 75%). The analysis was based primarily on the descriptions of forest stands and the quantitative and qualitative characteristics, presenting at the same time the problems that SFD has with conducting rational forest management in acquired plots. The current status of the forests transferred from the State Land Fund was assessed as unsatisfactory. The main problems in local conditions are: (i) inadequate fixation in acquired parcels next to private forests (difficulty in locating treatments and custody over the State property), (ii) depleted tree stands, (iii) inadequate parcels (too narrow) and (iv) complications related to co−ownership of parts seized plots. The need to carry out joint−assembly works (mainly land consolidation) or to introduce land communities that would facilitate the management of these forests was demonstrated.

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Zmiany powierzchni lesnej Wysoczyzny Kaliskiej w kontekscie analizy struktury krajobrazu

67%

Markuszewska I.

Badania Fizjograficzne nad Polską Zachodnią. Seria A: Geografia Fizyczna

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2005

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tom 56

93-106

Ograniczanie wyników

2 Sylwan

1 Badania Fizjograficzne nad Polską Zachodnią. Seria A: Geografia Fizyczna

1 Borecki T.

1 Kedziora W.

1 Markuszewska I.

1 Orzechowski M.

1 Pienkowski P.

1 Wojcik R.

1 Wrzosek E.

1 2019

1 2015

1 2005

Ocena fragmentacji lasów Pomorza Zachodniego pomiędzy XV a XX wiekiem

Drzewostany przejęte z Państwowego Funduszu Ziemi – stan i problemy zagospodarowania

Zmiany powierzchni lesnej Wysoczyzny Kaliskiej w kontekscie analizy struktury krajobrazu