Marius Floriancic

Last Name

Floriancic

First Name

Marius

ORCID

0000-0001-5108-4580

Organisational unit

08739 - Molnar, Peter (Tit. Prof) / Molnar, Peter (Tit. Prof)

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Publications 1 - 10 of 40

Estimating mixing processes of sources contributing to baseflow in Alpine headwater catchments
Floriancic, Marius; Roques, Clément; Jimenez-Martinez, Joaquin (2020)
EGUsphere
Low-flow seasonality across Switzerland - Climatic drivers and the influence of landscape
Floriancic, Marius; Berghuijs, Wouter Reinier; Molnar, Peter (2018)
Quantification of enrichment processes in throughfall and stemflow in a mixed temperate forest
Grundmann, Maria H.; Molnar, Peter; Floriancic, Marius (2024)
Hydrological Processes
Forest ecosystems depend on throughfall and stemflow fluxes for both water and nutrient input. Spatial and temporal variability of throughfall and stemflow fluxes are large and differ between tree species. The nutrient fluxes that accompany throughfall and stemflow are affected by climate, precipitation intensity, the seasonality of dry deposition, and canopy exchange processes. The interdependence of these factors makes it challenging to quantify changes in throughfall and stemflow amounts as well as their nutrient content. Here, we provide observation-based evidence from 3.5 years of data collection with 222 rainfall events, of the seasonal variability of throughfall and stemflow magnitude and ion concentrations under a beech (Fagus silvatica) and spruce (Picea abies) tree. Interception and canopy cover were seasonally variable, average annual interception was 53% below beech, 61% below spruce and 68% below young spruce canopies. Further, we assess seasonality of ionic nutrients such as NH4 and NO3 as well as Mg, Ca and K and their dependence on both dry deposition and canopy exchange. Throughfall and stemflow were enriched compared to precipitation, with large differences between ions and different months. Antecedent precipitation was a main control on throughfall and stemflow enrichment. We developed a conceptual model of the potential drivers of throughfall and stemflow enrichment based on our observations. While NH4 and NO3 enrichment are likely dominated by dry deposition and dew and fog accumulation, Mg, Ca and K were additionally affected by canopy exchange. Observation based studies such as this one are needed to understand precipitation and nutrient partitioning across forests, which enables the prediction of how changes in climate and forest composition will affect local hydrology and nutrient inputs into forest ecosystems.
Spatial and temporal characteristics of low flows across Switzerland
Floriancic, Marius; Berghuijs, Wouter Reinier; Molnar, Peter (2018)
Geophysical Research Abstracts
Low-flow seasonality across Switzerland - Climatic drivers and the influence of landscape
Floriancic, Marius; Berghuijs, Wouter Reinier; Molnar, P. (2018)
Potential for significant precipitation cycling by forest-floor litter and deadwood
Floriancic, Marius; Allen, Scott Thomas; Meier, Raphael; et al. (2023)
Ecohydrology
The forest-floor litter layer can retain substantial volumes of water, thus affecting evaporation and soil-moisture dynamics. However, litter layer wetting/drying dynamics are often overlooked when estimating forest water budgets. Here, we present field and laboratory experiments characterizing water cycling in the forest-floor litter layer and outline its implications for subcanopy microclimatic conditions and for estimates of transpiration and recharge. Storage capacities of spruce needle litter and beech broadleaf litter averaged 3.1 and 1.9 mm, respectively, with drainage/evaporation timescales exceeding 2 days. Litter-removal experiments showed that litter reduced soil water recharge, reduced soil evaporation rates, and insulated against ground heat fluxes that impacted snowmelt. Deadwood stored similar to 0.7 mm of water, increasing with more advanced states of decomposition, and retained water for >7 days. Observed daily cycles in deadwood weight revealed decreasing water storage during daytime as evaporation progressed and increasing storage at night from condensation or absorption. Water evaporating from the forest-floor litter layer modulates the subcanopy microclimate by increasing humidity, decreasing temperature, and reducing VPD. Despite the relatively small litter storage capacity (<3.1 mm in comparison to similar to 10(2) mm for typical forest soil rooting zones), the litter layer alone retained and cycled 18% of annual precipitation, or 1/3 of annual evapotranspiration. These results suggest that overlooking litter interception may lead to substantial overestimates of recharge and transpiration in many forest ecosystems.
Using stable isotopes to inform water resource management in forested and agricultural ecosystems
Scandellari, Francesca; Attou, Taha; Barbeta, Adrià; et al. (2024)
Journal of Environmental Management
Present and future climatic trends are expected to markedly alter water fluxes and stores in the hydrologic cycle. In addition, water demand continues to grow due to increased human use and a growing population. Sustainably managing water resources requires a thorough understanding of water storage and flow in natural, agricultural, and urban ecosystems. Measurements of stable isotopes of water (hydrogen and oxygen) in the water cycle (atmosphere, soils, plants, surface water, and groundwater) can provide information on the transport pathways, sourcing, dynamics, ages, and storage pools of water that is difficult to obtain with other techniques. However, the potential of these techniques for practical questions has not been fully exploited yet. Here, we outline the benefits and limitations of potential applications of stable isotope methods useful to water managers, farmers, and other stakeholders. We also describe several case studies demonstrating how stable isotopes of water can support water management decision-making. Finally, we propose a workflow that guides users through a sequence of decisions required to apply stable isotope methods to examples of water management issues. We call for ongoing dialogue and a stronger connection between water management stakeholders and water stable isotope practitioners to identify the most pressing issues and develop best-practice guidelines to apply these techniques.
Field evidence of riparian vegetation response to groundwater levels in a gravel-bed river
Martinetti, Stefano; Fatichi, Simone; Floriancic, Marius; et al. (2021)
Ecohydrology
Vegetation establishment, growth, and succession in riparian ecosystems are linked to river flow dynamics and groundwater table fluctuations. This is especially true in Alpine gravel‐bed rivers with wide floodplains, geomorphically active floods, and a strong river‐aquifer exchange. The role of short‐term groundwater fluctuations is not always clear in these ecosystems, as it is assumed that phreatophytic vegetation close to rivers is adapted to such conditions. Here we provide data evidence of riparian plant response to short‐term groundwater table fluctuations in a braided gravel‐bed river (Maggia). We used indirect physiological variables for photosynthesis and transpiration – stomatal conductance gs and daily variation in stem diameter ΔDd – which we measured at six mature riparian trees of the Salicaceae family at two sites with different mean depths to groundwater during two growing seasons. The data demonstrate that (a) short‐term variation of the groundwater table affects riparian vegetation – at the site with deeper groundwater, the water table depth was the best predictor of gs variability, while at the site with shallower groundwater, temperature and vapor pressure deficit were the best predictors of ΔDd variability; (b) instantaneous stomatal conductance is related to vapor pressure deficit (V PD), but conditioned by groundwater levels, with higher stomatal conductance for the same radiative input and V PD when the water table was higher for all trees; (c) local micro‐climate measured at tree locations had a stronger predictive power for gs than valley scale climate, suggesting local climate controls on vegetated stands on gravel bars. Our results provide evidence of riparian trees undertaking physiological adjustments to transpiration in response to groundwater stage, depending on their riparian floodplain setting.
Low-flow seasonality across Switzerland - Climatic drivers and the influence of landscape
Floriancic, Marius; Berghuijs, Wouter Reinier; Molnar, Peter (2018)
Spatial variability in specific discharge and streamwater chemistry during low flows: Results from snapshot sampling campaigns in eleven Swiss catchments
Floriancic, Marius; Fischer, Benjamin M.C.; Molnar, Peter; et al. (2019)
Hydrological Processes

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Marius Floriancic

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