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Runoff and sediment transport on mediterranean micro-plots scale with different vegetation cover

The study presents an analysis of precipitation, runoff and sediment transport on micro-scale plots, on bare ground and on area covered by grass and Spanish broom (Spartium junceum L.), in the Suvava catchment (central Dalmatia, south Croatia). The hydrological experimental plots were set parallel to the inclination of 16°, on marl lime stone and shallow and very skeletal soil (calci-mollic cambisol) and are equipped with rain gauge. At the plots the runoff and suspended sediment were monitored after every rainy day. The monthly runoff was highly variable, ranging between 0.10 to 4.40 mm m-2 on the plot covered by Spanish broom ; between 0.30 to 9.86 mm m-2 on the plots with grass cover and between 1.10 to 21.70 mm m-2 on the bare ground. The monthly sediment transport also was highly variable. It was ranging between 0.04 to 0.71 kg ha-1 on the plots covered by Spanish broom ; grass cover between 0.06 to 11.68 kg ha-1 and on bare ground between 0.4 to 558.1 kg ha-1. Average annual runoff on bare ground was bigger for 10 times and on the plot covered by grass 4 times than on plot covered by Spanish broom. Annual coefficients of runoff on the investigated types of vegetation cover were small and did not exceed 10 % of total annual rainfall. Sediment transport on bare ground plot was bigger 690 times and under grass cover 13 times than on plot covered by Spanish broom on the same inclination. Research results showed that vegetation cover on experimental plots has big impact on the runoff and sediment transport. Runoff and sediment transport are in strong linear dependence on rainfall quantity, duration and intensity.

bare ground, grass cover, rainfall, runoff, sediment transport, Spanish broom

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