## 3 Results
### GPP, Reco, and NEE Fluxes  
The fluxes of GPP, Reco, and NEE modeled for the individual plots (HWL, HWL_Si, LWL, LWL_Si) for the years 2021-2022 are shown in Figure 3. When analyzing the GPP values, a clear seasonal variation is noticeable. In the winter months, values close to zero occurred, whereas the GPP of the summer months reached up to \(-33\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\). When interpreting these data, it should be noted that negative GPP values indicate the loss of CO\({}_{2}\) from the atmosphere and its simultaneous assimilation by plants. The highest assimilation rates were recorded in July 2021 when the GPP was \(-25.53\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the HWL, \(-33.53\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the HWL_Si, \(-28.67\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the LWL, and \(-22.48\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the LWL_Si plot. In addition, during the winter season, the lower activity of microorganisms and plants caused by low temperatures resulted in Reco values close to zero. The increase in air temperature in the spring periods resulted in a gradual increase in Reco (Figure 3b). Regardless of the analyzed plots, the highest CO\({}_{2}\) emission rates occurred in June and July 2021. Reco fluxes reached up to \(22.00\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the HWL, \(20.63\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the HWL_Si, \(17.90\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the LWL, and \(26.46\) gCO\({}_{2}\)-C\(\cdot\)m\({}^{-2}\).day\({}^{-1}\) at the LWL_Si. Furthermore, daily rates of Reco fluxes were higher in 2021 than in 2022. The modeled daily NEE fluxes expressed very high seasonal variability, especially during the growing period. It has to be noted here that whenever NEE fluxes are positive, emissions prevail over assimilation, whereas when they are negative, the situation is reversed. In \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Period**} & \multirow{2}{*}{**Dates**} & \multirow{2}{*}{**Duration** **(Days)**} & **Average** & \multirow{2}{*}{**Precipitation** **(mm)**} & **Average Soil** & **Average** & \multirow{2}{*}{**Average** **WTD at** **HWL (mbgl)**} & **Average** \\  & & & **Daily** & **Temperature** & **(mm)** & **Moisture** & **Moisture** & **WTD at** **HWL (mbgl)** & **LWL** \\ \hline I cut 2021 & 24.03.21–31.05.21 & 69 & 9.0 & 98.2 & 56 & 50 & 0.34 & 0.61 \\ II cut 2021 & 1.06.21–14.07.21 & 44 & 19.4 & 95.7 & 47 & 42 & 0.66 & 0.81 \\ III cut 2021 & 15.07.21–30.09.21 & 78 & 16.8 & 138.5 & 41 & 33 & 0.79 & 0.98 \\ \hline Growing season 2021 & 24.03.21–22.11.21 & 244 & 13.3 & 404.4 & 47 & 41 & 0.64 & 0.85 \\ \hline I cut 2022 & 14.03.22–6.06.22 & 85 & 10.2 & 91.3 & 37 & 32 & 0.61 & 0.82 \\ II cut 2022 & 7.06.22–15.08.22 & 70 & 19.6 & 129.7 & 18 & 16 & 0.88 & 1.05 \\ III cut 2022 & 16.08.22–17.11.22 & 94 & 12.9 & 237.4 & 47 & 42 & 0.52 & 0.75 \\ \hline Growing season 2022 & 14.03.22–15.11.22 & 247 & 13.9 & 458.4 & 35 & 31 & 0.65 & 0.86 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Characteristics of individual cuts, including their duration, average daily air temperature, rainfall, average soil moisture, and water table depth (WTD) at the HWL and LWL sites. Figure 2: Environmental conditions at the study area in 2021–2022; **(a)** air temperature; **(b)** precipitation and soil moisture; **(c)** groundwater table depth at the HWL (blue lines) and LWL (orange lines) sites. the winter season, NEE fluxes were positive, equal to Reco, and close to zero.