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The task of optimal management of the dam reservoir ecosystem was formulated in a very abstract and general way. To solve this problem, on the simplified example of such an ecosystem, method of fuzzy logic was employed. Various scenarios of ecosystem management of dam reservoir has been investigated. Water level changes, inflow of waste waters and fish culturing were taken into consideration. It was shown that for practical management of dam reservoir it is necessary to construct a complex model of such an ecosystem.
An integrated ecological system model was used to determine the influence on Baltic phytoplankton of the long-term variability in the sea’s main physical parameters. A three-dimensional coupled sea-ice model was developed. A simple ecosystem was added to the sea-ice model and used to estimate phytoplankton variability during long-term changes in the main atmospheric forces. Scenarios similar to those of climate were performed by altering the main physical parameters such as temperature, wind speed, solar and thermal radiation (in different configurations). The influence of the variability in these parameters on phytoplankton is discussed.
Studies on the comparison of microbial and biochemical characteristics of soils were based on a field experiment established in 1994 at the IUNG Experimental Station in Osiny on soil (loamy sand) belonging to complex IV. In this experiment spring barley and winter wheat were grown in three crop production systems: ecological, integrated and conventional. Soil under wheat were analysed in 1996, 1997 and 1998, and under barley in 1997 and 1998. Microbial biomass, numbers of bacteria and fungi, soil respiration and enzymes (dehydrogenase, phosphatases) activity were generally higher in the soil under the tested cereals grown in the ecological system than in the soil under these crops grown in the conventional or integrated system. These differences were detected during all three growing seasons, indicating long-lasting changes in the biological characteristics of the studied soil.
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