Canopy interception estimates in a Norway spruce forest and their importance for hydrological modelling

Kofroňová, Jitka; Šípek, Václav; Hnilica, Jan; Vlček, Lukáš; Tesař, Miroslav

doi:10.1080/02626667.2021.1922691

Cited by 11 publications

(9 citation statements)

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“…For each precipitation event during our study period (15 March 2020 to 8 August 2022), we assume that 20% of incoming precipitation is lost to canopy interception, and the remaining 80% reaches the forest floor as throughfall. Literature values for canopy interception range from 9% to 29% for beech forests (Minďaš et al, 2018; Rowe, 1983) and from 23% to 37% for spruce forests (Dohnal et al, 2014; Holko et al, 2009; Kofroňová et al, 2021; Ringgaard et al, 2014; Xiao et al, 2000). For each precipitation event, we assume that interception by the litter layer equals the total throughfall amount, or the available litter layer water storage (the storage capacity of 1.75 mm for litter and 0.4 for deadwood, minus the actual storage in litter and deadwood), whichever is smaller.…”

Section: Resultsmentioning

confidence: 99%

“…To estimate the mean storage potential of the forest-floor litter layer at our field site, we combine laboratory and field measurements (in bold) with assumptions on the typical saturation reached during precipitation events (in italics) as summarized below across Switzerland of 34 m 3 ha À1 (Lachat et al, 2019) and from other temperate mixed forests in previous studies including 47 m 3 ha À1 in Romania (Öder et al, 2021) and up to 50.5 m 3 ha À1 in Poland (Bujoczek et al, 2021). We estimated the overall storage capacity of deadwood at our site by using a mean dry deadwood density of 240 kg m À3 (Přívětivý & Šamonil, 2021) Literature values for canopy interception range from 9% to 29% for beech forests (Min ďaš et al, 2018;Rowe, 1983) and from 23% to 37% for spruce forests (Dohnal et al, 2014;Holko et al, 2009;Kofroňová et al, 2021;Ringgaard et al, 2014;Xiao et al, 2000). For each precipitation event, we assume that interception by the litter layer equals the total throughfall amount, or the available litter layer water storage (the storage capacity of 1.75 mm for litter and 0.4 for deadwood, minus the actual storage in litter and deadwood), whichever is smaller.…”

Section: T a B L Ementioning

confidence: 99%

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Potential for significant precipitation cycling by forest‐floor litter and deadwood

et al. 2022

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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 $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 $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.

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Section: Resultsmentioning

confidence: 99%

Section: T a B L Ementioning

confidence: 99%

Potential for significant precipitation cycling by forest‐floor litter and deadwood

et al. 2022

View full text Add to dashboard Cite

show abstract

“…For each precipitation event during our study period (15 March 2020 -08 August 2022), we assume that 20% of incoming precipitation is lost to canopy interception, and the remaining 80% reaches the forest floor as throughfall. Literature values for canopy interception range from 9% to 29% for beech forests (Min ďaš et al, 2018;Rowe, 1983), and from 23% to 37% for spruce forests (Holko et al, 2009;Xiao et al, 2000;Kofroňová et al, 2021;Dohnal et al, 2014;Ringgaard et al, 2014). For each precipitation event, we assume that interception by the litter layer equals the total throughfall amount, or the available litter-layer water storage (the storage capacity of 1.75 mm for litter and 0.4 for deadwood, minus the actual storage in litter and deadwood), whichever is smaller.…”

Section: Litter Interception and Water Storagementioning

confidence: 99%

Potential for significant precipitation cycling by forest-floor litter and deadwood

Floriancic

Allen

Meier

et al. 2022

Preprint

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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 mm 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 ~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 ~10 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.

show abstract

Section: Litter Interception and Water Storagementioning

confidence: 99%

Potential for significant precipitation cycling by forest-floor litter and deadwood

Floriancic

Allen

Meier

et al. 2022

Preprint

View full text Add to dashboard Cite

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 mm 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 ~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 ~10 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.

show abstract

Canopy interception estimates in a Norway spruce forest and their importance for hydrological modelling

Cited by 11 publications

References 50 publications

Potential for significant precipitation cycling by forest‐floor litter and deadwood

Potential for significant precipitation cycling by forest‐floor litter and deadwood

Potential for significant precipitation cycling by forest-floor litter and deadwood

Potential for significant precipitation cycling by forest-floor litter and deadwood

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