20.500.12556/RUL-128465 Lag times as indicators of hydrological mechanisms responsible for NO$_3$-N flushing in a forested headwater catchment Understanding the temporal variability of the nutrient transport from catchments is essential for planning nutrient loss reduction measures related to land use and climate change. Moreover, observations and analysis of nutrient dynamics in streams draining undisturbed catchments are known to represent a reference point by which human-influenced catchments can be compared. In this paper, temporal dynamics of nitrate-nitrogen (NO$_3$-N) flux are investigated on an event basis by analysing observed lag times between data series. More specifically, we studied lag times between the centres of mass of six hydrological and biogeochemical variables, namely discharge, soil moisture at three depths, NO$_3$-N flux, and the precipitation hyetograph centre of mass. Data obtained by high-frequency measurements (20 min time step) from 29 events were analysed. Linear regression and multiple linear regression (MLR) were used to identify relationships between lag times of the above-mentioned processes. We found that discharge lag time (LAG$_Q$) and NO$_3$-N flux lag time (LAG$_N$) are highly correlated indicating similar temporal response to rainfall. Moreover, relatively high correlation between LAG$_N$ and soil moisture lag times was also detected. The MLR model showed that the most descriptive variable for both LAG$_N$ and LAG$_Q$ is amount of precipitation. For LAG$_N$, the change of the soil moisture in the upper two layers was also significant, suggesting that the lag times indicate the primarily role of the forest soils as the main source of the NO$_3$-N flux, whereas the precipitation amount and the runoff formation through the forest soils are the main controlling mechanisms. hydrological processes soil moisture precipitation runoff nitrate flux forested catchment time lag hidrološki procesi vlažnost tal padavine odtok gozdnato porečje čas zakasnitve true false true Angleški jezik Slovenski jezik Članek v reviji 2021-07-14 10:41:29 2021-07-14 10:41:32 2022-09-07 04:15:20 0000-00-00 00:00:00 2020 0 0 13 str. iss. 4, art. 1092 Vol. 12 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 556 2073-4441 10.3390/w12041092 9113441 RAZ_Sapac_Klaudija_2020.pdf RAZ_Sapac_Klaudija_2020.pdf 1 D98A894272BD7559A15CD2A53C59EDD6 c4cc6a52ed24b0c45da8390ba83a315df906ba5d26fbb128b8b22e396e817616 4e392e2a-e47f-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145212 https://www.mdpi.com/2073-4441/12/4/1092 0 2599a869-e47f-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145211 Fakulteta za gradbeništvo in geodezijo 0 0 0