Distribution of chosen matters in soil and water in a small agricultural catchment

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027049%3A_____%2F21%3AN0000118" target="_blank" >RIV/00027049:_____/21:N0000118 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Distribution of chosen matters in soil and water in a small agricultural catchment

Original language description

surface water degradation in intensively farmed catchments. Disturbance of soil surface with erosion, loss of soil particles and nutrients evokes reduction of soil fertility but, on the other side (among others), it negatively influences siltation of water bodies and surface water quality. Erosion processes and transport of chosen matters have been studied in a small agricultural catchment Němčický stream in the Czech Republic. The experimental catchment (3 km2) is situated in a hilly area north from Brno. Continual gauging of outflows and precipitations runs in the stream profile equipped with a Thomson´s weir and ultrasonic probe. Samples of surface water are taken with an automatic sampler during extreme rainfall-runoff events. Concentrations of insoluble matters, phosphorus, nitrogen and pesticides are analysed in them. Contents of the nutrients (mentioned above) and pesticides are monitored in ploughed soils and sediments in stream and on the bottom of reservoir closing the experimental catchment. The results enable to evaluate siltation velocity in the reservoir and to investigate nutrients transport in the catchment. From the year of the reservoir construction (2012), the bottom sediment has risen of 0.6 mm/year on the average. Total nitrogen and likewise phosphorus concentration in the bottom sediment appears to be nearly twice higher than in soils. Concerning pesticide load in soils, the highest concentrations were found out for glyphosate (0.33 mg/kg), AMPA (0.21 mg/kg), diflufenican and tebuconazole. In bottom sediments, there was average concentration of metabolite AMPA (0.27 mg/kg) higher than of glyphosate (0.15 mg/kg). The most significant pesticide matters in surface water were dimethachlor ESA (0.59 µg/l), metolachlor ESA (0.54 µg/l) and AMPA (0.32 µg/l). The study is supported by the Ministry of Agriculture of the CR, in the frame of research projects RO0218 and QK1910282.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

<a href="/en/project/QK1910282" target="_blank" >QK1910282: Options for mitigation of the impacts of extreme hydrological events in small catchments with respect to the demands of sustainable agriculture and pond aquaculture</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů