Transformation of the Landscape Structure of the Selected Testing Grounds in the Tri-city Agglomeration in the Years 1985–2012

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Potential possibilities of transformation of the land cover options considered_

	Forests (F.)	Grasslands (G.)	Surface waters (W.)	Built-up areas (B.)
Forests (F.)		F. → G.	F. → W.	F. → B.
Grasslands (G.)	G. → F.		G. → W.	G. → B.
Surface waters (W.)	W. → F.	W. → G.		W. → B.
Built-up areas (B.)	B. → F.	B. → G.	B. → W.

Characteristics of surface area, location and land cover of the selected testing grounds_

Location of research area*	Characteristics
A – Area: 10.5 km2Mesoregion: Pobrzeże Kaszubskie (Kashubian Coast)Microregions: Pradolina Kaszubska (Kashubian Glacial Valley); Kępa Rekowska (fragment).	The testing ground includes a fragment of the Reda valley, the so-called Mostowe Błota, between Rekowo Dolne and Reda-Ciechocino in the west, the Połchowo area in the north and the Łyski Channel in the south. The testing ground has an agricultural character.
B – Area: 12 km2Mesoregion: Pojezierze Kaszubskie (Kashubian Lake District).Microregions: Wysoczyzna (Upland) Gniewowsko-Bieszkowicka; the Valley of Zagórska Struga; Wysoczyzna Łężycko-Chwaszczyńska.	The relief is very dynamic and the main natural axis is Zagórska Struga. There are numerous small natural water reservoirs. The landscape of the testing ground changes its character from agricultural to residential and recreational.
C – Area: 17.25 km2Mesoregion: Pojezierze Kaszubskie (Kashubian Lake District).Microregions: Wysoczyzna Gdańska; the Valley of the Radunia River; Wysoczyzna Arciszewsko-Jagatowska	The Radunia valley, which constitutes the entire testing ground, is characterised by strong dynamics of relief formation processes due to its steep slopes. The development of the testing ground has a residential and recreational character.
D – Area: 17.25 km2Mesoregions: Pojezierze Kaszubskie (Kashubian Lake District); Żuławy Wiślane.Microregions: Wysoczyzna Arciszewsko-Jagatowska; the Valley of the Kłodawa River (fragment).	The area includes a fragment of Żuławy on the border with Gdańsk Upland. The development is connected with the southern part of the city of Pruszcz Gdański (mainly industrial and warehousing) and the villages of Rusocin and Cieplewo (residential). The eastern part still plays an agricultural role, while the north-eastern part is occupied by a military airport.

Distinguished ranges of changes according to the value of the structural convergence index_

Structural convergence index (c)	Range of changes
0.000	total changes
0.001; 0.399	great
0.400; 0.849	average
0.850; 0.974	small
0.975; 0.999	very small
1.000	no changes

Loss of selected forms of land cover in the years 1985–2000 and 2001–2012_

Losses [km2]	1985–2000	2001–2012	Multiple of losses in second period in relation to first period
Forests	1.5963	10.6659	×6.7
Grasslands	33.4734	66.8310	×2.0
Surface waters	0.7859	1.1892	×1.5
Built-up areas	0.7295	5.1754	×7.0