Small water bodies formed after peat digging in Dobrzyńskie Lakeland / Ma?e zbiorniki wodne powsta?e po wydobyciu torfu na Pojezierzu Dobrzyńskim

摘要

Post-peat water bodies formed as a result of peat digging for fuel in the 19th and the first half of the 20th century are common in the middle part of Dobrzy??skie Lakeland. In many cases peat was dug almost completely to form small water bodies. In the studied part of the lakeland 56.24 ha or 10.20% of peatland area have been exploited. The share of peatlands in the surface area of particular regions varied from 3.79% to 9.81%. The degree of peat exploitation also varied. Peat coverage of 7.06% was larger than the mean for Poland (3.80%) but close to that in young glacial areas. A group of water bodies formed after peat digging differed in terms of water quality. Physical and chemical properties of waters in studied water bodies are typical of surface and shallow ground waters in young glacial areas. They are fresh waters of a slightly higher content of mineral ions and of neutral to alkaline pH. Their electrolytic conductivity ranged between 300 and 500 ??Sa??cm-1. Bicarbonates and calcium dominated their ionic composition. Post-peat water bodies were colonised by pleustonic and rush plant communities. Their species composition indicates eutrophic habitat conditions. Despite the fact that post-peat water bodies were formed as a result of intense environmental disturbance, now they increase landscape diversity of the middle part of Dobrzy??skie Lakeland and are habitats of many rare and endangered plant species.