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Ocena fragmentacji lasów Pomorza Zachodniego pomiędzy XV a XX wiekiem

100%

Pienkowski P.

Sylwan

2015

tom 159

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.

Przyczyny zmniejszania się lesistości Polski

50%

Lesikowski W.

Sylwan

1932

tom 50

nr 02

Ograniczanie wyników

2 Sylwan

1 Lesikowski W.

1 Pienkowski P.

1 2015

1 1932

Wyniki wyszukiwania

Ocena fragmentacji lasów Pomorza Zachodniego pomiędzy XV a XX wiekiem

Przyczyny zmniejszania się lesistości Polski