How can the grasslands under rainfall events modify water balance in drought conditions

• Autorzy: Minea G. , Tudor G. , Stan F.-I. , Ioana-Toroimac G. , Zamfir R.

Identyfikatory

DOI

10.2478/jwld-2018-0042

Warianty tytułu

PL

W jaki sposób użytki zielone w okresie opadów mogą modyfikować bilans wodny w warunkach suszy

• Języki publikacji: EN

Abstrakty

EN

Taking into account the well-established influence of hillslopes grasslands on runoff processes, the purpose of this study was to investigate how grasslands can affect the water flow pathways on hillslopes, in drought conditions. This study was performed in experimental grassland at plot-scale (e.g., Festuca pratensis), in temperate humid continental climatic conditions of Curvature Subcarpathians, Romania. The rainfall, evapotranspiration, and soil moisture daily data, respectively 208 rainfall and 16 rainfall-runoff events data measured in grassland hills during the growing season (1 April up to 30 September 2015 and 2016) were used. Our results suggest that a runoff event response in extreme drought conditions occurs on grasslands only if precipitation exceeds the threshold of 31 mm Hortonian overland flow (HOF), while this threshold drops to 17 mm during moderate droughts and up to 8 mm for wet conditions. The rainfall events up to 16 mm proved to be insufficient to completely saturate the soil. Therefore, HOF has only a minor contribution in drought conditions, on grassland and light on bare soil. A complementary and negative effect of grasslands in drought conditions is the water resources suppressing on hillslopes.

PL

Biorąc pod uwagę dobrze znany wpływ użytków zielonych na stokach na odpływ wody, celem było zbadanie, jak te siedliska mogą wpływać na drogi przepływu wody w warunkach suszy. Badania prowadzono na eksperymentalnych poletkach porośniętych na przykład przez Festuca pratensis w warunkach umiarkowanie wilgotnego klimatu kontynentalnego na Pogórzu Karpackim w Rumunii. Do analizy użyto dane o opadach, ewapotranspiracji i wilgotności gleby (208 danych o opadach i 16 kombinacji opad–odpływ) pozyskanych z pomiarów na pagórkach pokrytych roślinnością trawiastą w sezonie wegetacyjnym od 1 kwietnia do 30 września w latach 2015 i 2016. Uzyskane wyniki wskazują, że odpływ w warunkach skrajnej suszy występuje w siedliskach trawiastych jedynie wtedy, gdy opad przekroczy wartość 31 mm powierzchniowego odpływu Hortona (HOF). Wartość HOF maleje do 17 mm w warunkach umiarkowanej suszy i do 8 mm w warunkach wilgotnych. Okresy opadów do 16 mm okazały się niewystarczające do całkowitego nasycenia gleby. Z tego powodu przepływ powierzchniowy ma w warunkach suszy znikome znaczenie w siedliskach trawiastych i niewielkie na odkrytej glebie. Komplementarnym i ujemnym skutkiem występowania użytków zielonych jest ograniczenie zasobów wodnych na stokach.

Słowa kluczowe

EN

grasslands; hydrological drought; plot-scale; rainfall-runoff events; water flow pathways

PL

drogi przepływu wody; poletka badawcze; susza hydrologiczna; użytki zielone; zdarzenia opad–odpływ

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2018
• Tom: no. 38
• Strony: 53--65
• Opis fizyczny: Bibliogr. 45 poz., rys., tab.

Twórcy

autor

Minea G.

• Research Institute of the University of Bucharest, University of Bucharest, 36-46 Bd. M. Kogălniceanu, Sector 5, 050107, Bucharest, Romania
• National Institute of Hydrology and Water Management, Bucharest, Romania

autor

Tudor G.

• National Institute of Hydrology and Water Management, Bucharest, Romania

autor

Stan F.-I.

• National Institute of Hydrology and Water Management, Bucharest, Romania

autor

Ioana-Toroimac G.

• University of Bucharest, Faculty of Geography, Bucharest, Romania

autor

Zamfir R.

• National Institute of Hydrology and Water Management, Bucharest, Romania

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