Health condition of European ash in young stands of diverse composition

Matisone, Ilze; Matisons, Roberts; Jansons, Āris

doi:10.46490/vol25iss1pp059

Cited by 3 publications

(4 citation statements)

References 20 publications

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“…Additionally, open field regeneration was found to be more vulnerable to the disease than seedlings under a forest canopy. Matisone et al (2019) obtained similar results in the study of young stands with ash in the composition in the forests of Latvia. Besides, the biodiversity of stands (shrub presence) and tree height are the main factors for stand resistance to H. fraxineus.…”

Section: Discussionsupporting

confidence: 72%

Common ash (Fraxinus excelsior L.) in Ukrainian forests and its successful natural regeneration

Tkach¹,

Rumiantsev²,

Luk’yanets³

et al. 2020

Forestry Studies

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The natural distribution area of common ash (Fraxinus excelsior L.) in the forests of Europe and Ukraine has been determined through the analysis of scientific works of Ukrainian and foreign researchers. According to the reference materials on the current state of Ukrainian forests (25 administrative regions), it is established that ash forests cover an area of about 150,000 ha or 2.4% of the total area of the country’s forests. Among them, common ash stands account for almost 87% or 130,000 ha; the rest are stands of introduced ash species, namely F. pennsylvanica Marsh., F. americana L., and F. lanceolata Borkh. The average age of ash stands is 59 years. Only 6.4% (8,300 ha) of the total area of ash forests is covered by pure ash stands, and the remaining area (93.6% or 121,700 ha) are mixed ones. It is revealed that the optimal natural and climatic conditions for the emergence, preservation and successful growth of natural regeneration of ash trees are fresh and moist fertile sites (rich in minerals) with well-drained soils, the light of at least 5–6% of that on an open space, and without abundant live ground cover. The highest number of seed regeneration of ash, about 7,000–8,000 stems ha−1 on average, was found under the canopy of mixed (ash share in the composition was 10 to 20% by stock) old (over 100 years old) stands with a relative density of stocking of 0.7–0.8. Promoting the natural seed regeneration of ash trees can be an effective way of increasing the sustainability of such stands and will ensure their preservation in the forests of Ukraine and in deciduous forests of Europe as a whole.

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Section: Discussionsupporting

confidence: 72%

Common ash (Fraxinus excelsior L.) in Ukrainian forests and its successful natural regeneration

Tkach¹,

Rumiantsev²,

Luk’yanets³

et al. 2020

Forestry Studies

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“…factors [3,11,12,[21][22][23], implying complex ecological interactions [8,21,24]. In most of the studies, the variables affecting the susceptibility of ash appear similar; however, their effects and interactions can differ regionally or even locally [8,18,22,25,26]. Regionally specific biotic interactions and resistance to dieback implies an uneven potential for common ash in the future [3,27].…”

Section: Introductionmentioning

confidence: 99%

“…Regionally specific biotic interactions and resistance to dieback implies an uneven potential for common ash in the future [3,27]. Nevertheless, these effects also imply potential to facilitate persistence or even some sustainability of common ash via region specific management [8,23,25,28].…”

Section: Introductionmentioning

confidence: 99%

The Struggle of Ash—Insights from Long-Term Survey in Latvia

Matisone

Matisons

Jansons

2021

Forests

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The dieback of common ash (Fraxinus excelsior L.) has dramatically decreased the abundance of the species in Europe; however, tolerance of trees varies regionally. The tolerance of trees is considered to be a result of synergy of genetic and environmental factors, suggesting an uneven future potential of populations. This also implies that wide extrapolations would be biased and local information is needed. Survival of ash during 2005–2020, as well as stand- and tree-level variables affecting them was assessed based on four surveys of 15 permanent sampling plots from an eastern Baltic region (Latvia) using an additive model. Although at the beginning of dieback a relatively low mortality rate was observed, it increased during the 2015–2020 period, which was caused by dying of the most tolerant trees, though single trees have survived. In the studied stands, ash has been gradually replaced by other local tree species, though some recruitment of ash was locally observed, implying formation of mixed broadleaved stands with slight ash admixture. The survival of trees was related to tree height and position within a stand (relative height and local density), though the relationships were nonlinear, indicating presence of critical conditions. Regarding temporal changes, survival rapidly dropped during the first 16 years, stabilizing at a relatively low level. Although low recruitment of ash still implies plummeting economic importance of the species, the observed responses of survival, as well as the recruitment, imply potential to locally improve the survival of ash via management (tending), hopefully providing time for natural resistance to develop.

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“…Even so the most intensive forest management (whole tree biomass harvesting) does not leave permanent negative effect on forest ecosystem (Jansons et al, 2016) it still changes the dominant age class of trees and leaves a long-lasting impact on forest legacies (Jogiste et al, 2018). Both the growth of trees as well as frequency and severity of disturbancesthus tree mortalitywill be (are) affected by climate changes (Katrevics et al, 2018, Matisone et al, 2019. Large-scale natural disturbances as well as single-tree mortality is a source of deadwood.…”

Section: Introductionmentioning

confidence: 99%

Carbon Pools in Old-Growth Scots Pine Stands on Organic Soils and Its Concentration in Deadwood: Cases Study in Latvia

Ķēniņa

Mača

Jaunslaviete

et al. 2020

Rural Development 2019

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Carbon sequestration is crucial to mitigate climate changes, therefore it is important to have accurate estimates of carbon pools in the forest. So far, data on carbon pools in old-growth forests are very scarce, therefore aim of the study was to assess the carbon pools in old-growth Scots pine stands on organic soil and carbon concentration in deadwood of different decay classes in Latvia. Carbon content in deadwood was test in samples, collected in 26 randomly selected over mature, unmanaged stands across Latvia (five samples per decay class and tree species). Carbon pools were assessed in 38 sample plots (size 500 m 2) in five Scots pine stands on wet organic soil (Caricoso-phragmitosa forest type) at the age of 167 to 203 years. Mean carbon concentration in deadwood across all species and decay classes was 46.6±1.57%. For aspen it did not change with progressing decay was found, but increase was observed for Scots pine, Norway spruce and birch. For these species difference in concentration between first three (more fresh) and last two decay classes (mean 45.9±0.9% and 49.9±1.6%, respectively) was statistically significant. Old-growth Scots pine stands on peat soils had rather large amount of deadwood: 100.6 ± 74.7 m 3 ha-1. However, its share in total carbon storage (290.0 ± 57.9 t ha-1) was small and most of carbon (57%) was found in soil. Mean annual carbon storage in tree biomass and deadwood decreased with stand age; its absolute value was similar in over-mature and mature (101-120 years) stands.

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Health condition of European ash in young stands of diverse composition

Cited by 3 publications

References 20 publications

Common ash (Fraxinus excelsior L.) in Ukrainian forests and its successful natural regeneration

Common ash (Fraxinus excelsior L.) in Ukrainian forests and its successful natural regeneration

The Struggle of Ash—Insights from Long-Term Survey in Latvia

Carbon Pools in Old-Growth Scots Pine Stands on Organic Soils and Its Concentration in Deadwood: Cases Study in Latvia

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