engleski

Soil water origin and dynamics in sloped vineyard, SUPREHILL project

The diversity of processes which take place in hillslope agro-ecosystems makes the estimation of vadose zone hydrology very challenging. This research presents first results related to the measurements of meteorological data, soil water content, granulometric composition and isotopic signature of soil water and precipitation within SUPREHILL project. Vadose zone observatory has been placed on agricultural sloped area in Zagreb, within experimental field Jazbina. For the evaluation of soil water origin and dynamics, precipitation and soil water have been sampled. First four sampling campaigns have been done in two week intervals, while after it was decided to start sampling on a monthly time period. Stable isotopes of hydrogen (Δ2H) and oxygen (Δ18O) from soil water and precipitation have been determined by laser spectroscopy. First results showed different isotopic signature in soil water compared to precipitation which suggests the existence of different infiltration patterns in the experimental site. Isotopic signature corresponds to the variation of water content at different depths. Furthermore, results suggest that preferential flow and infiltration of precipitation can be expected till the maximum depth of 0.8 m which is probably related to the existence of low permeable layer. Future research and long-term monitoring will focus on the quantification of subsurface soil water dynamics and preferential flow, as well as on the non- linear agrochemical transport processes.

soil water ; precipitation ; stable isotopes of water ; infiltration ; hillslope vineyard

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