Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2007
Volume 10
Issue 1
Topic:
Environmental Development
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Tandyrak R. , Grochowska J. 2007. IMPACT OF THE WATERSHED DEVELOPMENT ON THE CHEMICAL PROPERTIES OF WATER IN SMALL RESERVOIRS OF THE OLSZTYN CITY, EJPAU 10(1), #14.
Available Online: http://www.ejpau.media.pl/volume10/issue1/abs-14.html

IMPACT OF THE WATERSHED DEVELOPMENT ON THE CHEMICAL PROPERTIES OF WATER IN SMALL RESERVOIRS OF THE OLSZTYN CITY

Renata Tandyrak, Jolanta Grochowska
Faculty of Environmental Protection and Fishery, University of Warmia and Mazury, Olsztyn, Poland

 

ABSTRACT



The studies included forty-five small reservoirs located in the administrative borders of the Olsztyn city. The reservoirs were grouped according to the watershed development. Because the direct surroundings of the reservoirs were quite diverse, four main groups of the reservoirs were distinguished, and further divided into sub-groups. The main groups were: “municipal reservoirs” (built-up areas, waste land, neighbourhood of allotments, parks), “forest reservoirs” (mid-forest, field and forest, forest and meadow), “meadow reservoirs” (field and meadow, mid-meadow), and “other reservoirs” (mid-field, farm development). Water samples for the physico-chemical analyses were taken two times i.e., in May and October 2003. The chemical composition of water in the reservoirs depends a great deal on the watershed type. Water in the reservoirs sited in the urban and built-up watersheds was characterised by high electrolytic conductivity (218–1,182 µS cm-1) and high concentrations of chloride ions (to 193 mg dm-3). Water in the “forest reservoirs” was characteristic of high colour (to 320 mg Pt dm-3) and contained much allochthonous organic matter (to 64 mg O2 dm-3). Water in the reservoirs surrounded by coniferous trees was slightly alkaline or close to neutral whereas in those surrounded by broadleaf trees – alkaline. In the mid-meadow reservoirs low primary production was determined (chlorophyll a below 35 mg m-3, dry weight of seston from 0.4 to 11 mg dm-3). In the reservoirs adjoining farms, quality of the water was very low, as displayed mainly by the very high chlorophyll a content (to 717 mg m-3) and the super-saturation of water with oxygen (to 227 %).

Key words: small reservoirs, watershed, nutrients, trophic condition.


Renata Tandyrak
Faculty of Environmental Protection and Fishery,
University of Warmia and Mazury, Olsztyn, Poland
Prawochenskiego 1, 10-720 Olsztyn, Poland
email: renatat@uwm.edu.pl

Jolanta Grochowska
Faculty of Environmental Protection and Fishery,
University of Warmia and Mazury, Olsztyn, Poland
Prawochenskiego 1, 10-720 Olsztyn, Poland
email: jgroch@uwm.edu.pl

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