Assessing crown reduction as a strategy to mitigate drought stress during initial development of sessile oak and Norway spruce saplings

Central European Forestry Journal, Journal Year: 2025, Volume and Issue: 71(1), P. 3 - 13

Published: Feb. 1, 2025

Abstract Droughts, amplified by climate change, pose a significant threat to the success of both artificially and naturally regenerated forests. Understanding how these changes affect initial stages saplings development is crucial for forest establishment, particularly ecologically economically important species like Norway spruce sessile oak in Central Europe. This study investigated impact crown reduction (CR) 50% length on each species. Automatic dendrometers were installed 24 per precisely monitor growth water-related stem changes. The main objective was investigate potential ameliorative effect CR water-stressed during their development. Our hypothesized that CR, decreasing leaf area consequently water use, would improve availability facilitate sapling growth. results indicate may enhance soil thereby supporting but not those oak. tree deficit – an indicator status significantly improves subjected ( p < 0.05). Conversely, this treatment resulted depletion saplings. species-specific phenology revealed led increase number growing days compared In summary, be considered beneficial method alleviating stress saplings, especially drought. addition, further testing field conditions necessary confirm results.

Language: Английский

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Effects of soil parameters of radial stem growth of four spruce stands in Austria

Frontiers in Forests and Global Change, Journal Year: 2025, Volume and Issue: 8

Published: Feb. 21, 2025

Understanding tree growth in relation to environmental conditions is essential, particularly the context of climate change, where rising temperatures, frequent droughts, and disturbances threaten forest health productivity. This study uses high-resolution data from four intensively monitored Picea abies stands Austria (2010–2020), with dendrometers recording hourly stem increments on 10 trees per site, allowing for detailed analysis responses changes. For this purpose we tested different generalized additive mixed models (GAMs) using collected site. The best model consisted combinations soil moisture (SM) temperature (ST) data. Furthermore analyzed how relationships established differ three times during growing season. We found that high SM consistently had a positive effect growth, wheras ST varied depending timing. Our findings underscore importance monitoring conditions, species like , which are known their sensitivity changes due shallow rooting systems vulnerability drought.

Language: Английский

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Sap flow measurements in olive trees (Olea europaea L.) cultivar ‘Menara’ under regulated and sustained deficit irrigation strategies

Acta Horticulturae, Journal Year: 2025, Volume and Issue: 1419, P. 1 - 10

Published: Feb. 1, 2025

Language: Английский

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Somatic drought stress memory affects leaf morpho-physiological traits of plants via epigenetic mechanisms and phytohormonal signalling

Plant Gene, Journal Year: 2025, Volume and Issue: unknown, P. 100509 - 100509

Published: April 1, 2025

Language: Английский

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Effects of regulated and sustained deficit irrigation on water use, physiology and yield of ‘Menara’ olive trees, in Morocco

Irrigation Science, Journal Year: 2024, Volume and Issue: 42(5), P. 829 - 848

Published: June 20, 2024

Language: Английский

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The effect of thinning intensity on sap flow and growth of Norway spruce

Journal of Forest Science, Journal Year: 2023, Volume and Issue: 69(5), P. 205 - 216

Published: May 23, 2023

Forest thinning can be used as an adaptive measure to improve the growth and resistance of Norway spruce forests affected by climate change. The impact different intensities on sap flow, growth, tree water deficit 40-year-old was tested. High intensity (–61% basal area) resulted in increased tree-level flow compared control (+27%), but it caused a decrease stand-level transpiration (–34%) due reduced leaf area index. Low-intensity (–28% area), high-intensity thinning, showed similar responses vapour pressure global radiation, suggesting unchanged isohydric behaviour. Both low- treatments displayed greater radial than control. There were no differences between treatments. low-intensity treatment considered best utilisation with at level. had lower transpiration, implying improved soil availability. study expands ecophysiological understanding valuable silvicultural practice for adapting forest management effects

Language: Английский

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Growth of European beech recovered faster than that of Norway spruce after a five-year experimental drought in a mixed forest stand

Trees, Journal Year: 2023, Volume and Issue: 37(6), P. 1695 - 1715

Published: Oct. 6, 2023

Abstract Key Message Beech growth acclimated better during severe drought and recovered faster than spruce after ended. This was associated with a shift in performance along relative tree size towards small trees. The effects of several consecutive years the recovery reaction mature trees particular long-term have been poorly studied so far. In this study, we demonstrate reactions five-year treatment extended summer droughts, followed by controlled irrigation very productive mixed forest stand. We exposed 70-year-old Norway ( Picea abies [L.] Karst) 90-year-old European beech (Fagus sylvatica [L.]) to reduced precipitation using automatic throughfall exclusion TE ) roofs growing seasons from 2014 2018, irrigated early 2019 removed thereafter. From 2009 2022, monitored annual on 6 plots ambient Control conditions CO KROOF canopy experiment. lost significant drought, some dying others remaining at low level without stress. also significantly beginning but emerged stronger group. Spruce showed non-significant trend increased inter-specific compared intra-specific drought. found that benefitted more mixture phase itself. Most importantly, observed smaller for both species. change relationship between diameter increment is major finding our study suggests possible response mechanism prolonged key observation requires further investigation should be considered future management strategies under changing climatic conditions.

Language: Английский

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The combined effect of branch position, temperature, and VPD on gas exchange and water-use efficiency of Norway spruce

Biologia Plantarum, Journal Year: 2023, Volume and Issue: 67, P. 136 - 141

Published: June 15, 2023

The impact of climate change on the physiological processes Norway spruce in Central Europe is a significant concern. increased temperature and evaporative demand associated with may negatively affect its photosynthesis carbon-water balance. This study tests combined effect branch position, (T) water vapour pressure deficit (VPD) net photosynthetic rate (PN), stomatal conductance (gs), intrinsic water-use efficiency (WUEi) spruce. More than 11 000 gas-exchange measurements during summer 2018 revealed that position significantly affects gas exchange WUEi juvenile trees. Northern branches showed average 21% PN, 35% higher gs, 8% lower compared to southern (across T VPD conditions). PN gs differences between were temperature- VPD-dependent. We observed negative raising for both treatments, 40°C threshold causing rapid decline WUEi. Variability branches' at 42°C was abruptly due decoupling (low high gs). Surprisingly, no results this provide necessary information upscaling process-based modelling whole-crown exchange. Moreover, experimental studies should take into consideration prevent possible bias errors.

Language: Английский

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Drought-induced population decline in an exudivorous mammal and its relevance to forest management

Forest Ecology and Management, Journal Year: 2023, Volume and Issue: 548, P. 121424 - 121424

Published: Sept. 20, 2023

Droughts are predicted to increase in frequency and severity with climate change, so understanding their influence on species is fundamental future conservation actions. Knowledge of whether at risk decline due drought may change the direction how forests managed. Exudate feeding non-flying mammals be particularly sensitive conditions, negative effects exudates, but few studies adequate length have been conducted. We investigated occupancy abundance a threatened exudivorous mammal, yellow-bellied glider (Petaurus australis), were influenced by an extreme eastern Australia. conducted repeat surveys over eight years, which coincided that peaked year 6, was followed two years above average rainfall. Modelling suggested slight (0.96–0.89). A marked probability detection from pre-drought (0.72; 95 %CI: 0.65–0.79) post-drought (0.30; 0.19–0.40), had occurred. Data maximum number individuals detected per occupied site confirmed abundance. Counts ≥ 3 recorded 42% sites before only 6% after drought, equating 48% These findings suggest unreliable measure response this species. Other require detailed study. Identifying refuges for these should added existing forest management

Language: Английский

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Soil drought stress and high-temperature effects on photosystem II in different juvenile spruce provenances

Central European Forestry Journal, Journal Year: 2024, Volume and Issue: 70(2), P. 95 - 106

Published: June 1, 2024

Abstract With prolonged periods of drought and temperature extremes becoming more frequent, the stress on Norway spruce has increased, as its ecological optimum is in colder humid environments. However, it a tree species with good adaptability, due to great geographic intraspecific variability. In this study, we tested sensitivity chlorophyll fluorescence tools for early detection heat stress, well their combined effect, four Slovak Carpathian provenances, under controlled laboratory conditions. Responses photosynthetic parameters fast slow (light response curves) kinetics were analysed seedlings treatments: control, drought, heat, + heat. Heat stresses led decrease efficiency greater extent than case only individual stress. The less sensitive parameter impacted by was maximum quantum yield PSII photochemistry (Fv/Fm), while were: performance index based absorption light energy (PI ABS ), effective (Φ coefficients non-photochemical quenching (NPQ, q N ). significant variability responses provenances also observed. Seedlings from two studied responded better these abiotic (Pa-680 Pa-1500); however, Pa-1500 provenance highest altitude showed best ability resistance soil high effect. This rapid screening photosystems II importance selection resistant populations concurrent one measures mitigate climate change impacts.

Language: Английский

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