Suchergebnisse

In a field experiment, the dying off of sanitary-indicative bacteria in grasses when irrigating them with wastewater of a pig breeding complex was assessed. Watering was carried out with norms of 270, 180 and 90 m3/ha. Bacterial contamination of herbs was directly dependent on the rate of irrigation with wastewater. E. coli 10 days after watering with a wastewater norm of 270 m3/ha was preserved in plants, while at a rate of 180 and 90 m3/ha it was absent. After 21 days, this microorganism was absent in plants with all types of irrigation wastewater. For indicators of E. coli, the total microbial count (TBC), enterococci is adequate model of the exponential dying of bacteria in plants, depending on the time after watering wastewater. Microorganisms were distributed according to the rate of dying down as follows (in decreasing direction): E. coli (k = 0.48 day–1), TBC (k = 0.089–0.17 day–1), enterococci (k = 0.086–0.10 day–1). The time of a 10-fold reduction in the number of bacteria was smaller for E. coli – 4.76 days, for enterococci it varied from 22.91 to 26.69, for TBC – from 13.37 to 25.77 days. The obtained equations of multiple regression allowed to identify the most significant factors influencing the number of bacteria, as well as to predict it within the framework of the models created.

Abstract
Data regarding 25 lakes (9 Belarusian and 16 Polish) provided the basis for spectral analysis of water level fluctuations. The obtained output data concerned a 55-year observation sequence covering the years 1956-2010. The selection of lakes was determined by two factors, i.e. data continuity and inconsiderable anthropogenic impact. The lakes were divided into three groups depending on the course of the water level spectrum. The first group included the highest number of lakes (14) which were distinguished by smooth curves with no significant peaks (e.g. Lake Wygonoszczańskie). The second group shows a four-year variability (e.g. Lake Łukomskie). The third group is distinguished by an even peak of three-year water fluctuation (e.g. Lake Łebsko). The location of the lakes categorised into those three groups suggests a certain regionalisation. The first group is represented by lakes of central and northern Belarus, and eastern Poland. The second group includes lakes of eastern Belarus, and the third group - lakes of central and northern Poland. This suggests that alongside local factors, the location of the distinguished groups of lakes may also be determined by regional factors. Presumably, continentalism of climate increasing in an eastwards direction is one of the key factors responsible for the detected regional diversity of lake water level fluctuations.