| Popis: |
The traditional use of agricultural landscapes of small rivers is agricultural arable land, which requires a number of reclamations and agricultural work. Land drainage has a significant impact on the environment, but these activities were carried out almost without taking into account the requirements of environmental protection. Heavy metals have one of the most significant negative effects on the components of floodplain-channel complexes (floodplain soil, surface water, bottom sediments, macrophytes, hydrobionts). Studies have shown that drainage reclamation leads to a decrease in the content of humus in floodplain soil, collector-drainage runoff, changing the chemical composition of natural water, affects the processes of transitaccumulation of heavy metals from sediments to water. The integrated chemical and ecological assessment of the influence of drainage reclamation on the state of the floodplain soil – water-bottom sediments system showed a critical situation of pollution of agricultural landscapes of water basins with heavy metals. Drainage melioration also negatively affects the state of hydrobionts-aquatic vegetation and fish, heavy metals accumulate in their organisms, which leads to disruption of aquatic flora and fauna life processes. |
