Ground seed density patterns under conditions of strongly overlapping seed shadows in Abies alba Mill. stands

Paluch, Jarosław

doi:10.1007/s10342-011-0486-4

Cited by 18 publications

(7 citation statements)

References 40 publications

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“…communication). The average seed density of viable seeds observed within the stand was lower than most values reported for A. alba (Paluch 2011) and A. balsamea (Houle and Payette 1991) but within the range of variation among years. Large seed masts in silver fir Fig.…”

Section: Seed Dispersal Onto the Blowdown Zonecontrasting

confidence: 50%

Local seed dispersal in European silver fir (Abies alba Mill.): lessons learned from a seed trap experiment

Cremer

Ziegenhagen

Schulerowitz

et al. 2012

Trees

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Seed dispersal is an important factor influencing the genetic structure of forest tree populations. Knowledge about the seed shadow is important to assess the ability of tree species to colonize new and disturbed habitats or to respond to environmental change by migrating to more suitable habitats. In a seed trap experiment, we investigated local seed dispersal distances of silver fir seeds (Abies alba Mill.) by explicitly identifying mother trees. For this purpose, we matched microsatellite genotypes of maternal tissues of seeds with the genotypes of adult trees in the studied stand. Furthermore, we analysed the effect of morphological traits on dispersal distance, and we assessed the number of contributing mother trees and compared the seed density of the closed forest-stand with the adjacent blowdown. Based on 674 seeds collected in a grid of 37 seed traps, a significant decline in seed density was observed from within the forest to the forest blowdown area [40 m from the forest edge. A median dispersal distance of 31 m was determined for filled seeds based on direct assignment of seeds to their mother trees. This was higher than that determined in the previous studies using different methods. Dispersal distance was negatively correlated to seed-weight, but this was partially compensated for by the length of seed wings. A very large number of unassigned maternal genotypes (435) suggested that dispersal distance might have been underestimated. Lessons for future studies were: to perform a full genotypic inventory of adult trees in a defined perimeter, to increase the number of microsatellite markers and to study several sites over a period of several years.

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Section: Seed Dispersal Onto the Blowdown Zonecontrasting

confidence: 50%

Local seed dispersal in European silver fir (Abies alba Mill.): lessons learned from a seed trap experiment

Cremer

Ziegenhagen

Schulerowitz

et al. 2012

Trees

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“…Though this constraint may be considered of negligible importance in the case of heavy-seeded beech, it is more important for lighter seed weight species like fir and particularly spruce, which are characterized by a lower seed falling velocity (0.85 and 1.25 s m −1 , respectively; Kohlermann 1950) and higher seed dispersal distances. For example, for firs growing in forest interiors median dispersal distances of between 6 and 22 m were reported by authors using seed trap methodology (Sagnard et al 2007;Paluch 2011;Amm et al 2012;De Andrés et al 2014). Distances covered by spruce seeds are longer by about 35-50% compared to fir (Kohlermann 1950).…”

Section: Discussionmentioning

confidence: 99%

Interspecific effects between overstorey and regeneration in small-scale mixtures of three late-successional species in the Western Carpathians (southern Poland)

Paluch¹,

Bartkowicz²,

Moser

2019

Eur J Forest Res

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In mixed-species forests, species composition of the overstorey affects regeneration processes through its influence on seed rain intensity and micro-site characteristics. Based on extensive inventory data (1583 sample plots), this study investigated relationships between the percentages of silver fir (Abies alba Mill.), European beech (Fagus sylvatica L.), and Norway spruce (Picea abies (L.) H. Karst.) in the overstorey and in naturally established regeneration (seedlings of a height below 0.5 m). A useful framework for this analysis was the assumption that for a given stand density level expected seedling density increases approximately linearly with the increasing percentage of conspecific trees because of increasing seed supply. The analysis partly disproved this assumption and indicated that the species' proportions in the overstorey and regeneration change in a nonlinear manner. In the beech-fir and beech-spruce mixtures, a strong tendency for beech regeneration to increase its proportion was found in the stands with similar percentages of the species. Fir regeneration positively responded to the presence of beech and spruce in the overstorey; an over-proportional increase in fir percentage was found in stands with more than 60% of beech and, depending on stand density, in a wide range of mixture variants with spruce. These effects may be viewed as increase-when-rare mechanisms that limit superior competitors and counteract the transformation of mixed-species stands into monocultures of spruce or beech. The analysis indicated that reduced stand density considerably facilitates establishment of spruce regeneration in the mixtures with fir and beech, but decreases the percentage of fir regeneration in the mixtures with beech.

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“…Abies sibirica and Picea obovata are mainly wind dispersed, and due to their larger seed mass compared to DH (see Table ), their dispersal distances are comparatively short. Mean dispersal distances of the genus Abies are ∼8–25 m (Clark et al ., ; Sagnard et al ., ; Paluch, ) and of the genus Picea ∼13–5 m (for a meta‐analysis see fig. 9 of Wirth et al ., ).…”

Section: Methodsmentioning

confidence: 99%

Dispersal limitation drives successional pathways in Central Siberian forests under current and intensified fire regimes

Tautenhahn

Lichstein

Jung

et al. 2016

Global Change Biology

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Fire is a primary driver of boreal forest dynamics. Intensifying fire regimes due to climate change may cause a shift in boreal forest composition toward reduced dominance of conifers and greater abundance of deciduous hardwoods, with potential biogeochemical and biophysical feedbacks to regional and global climate. This shift has already been observed in some North American boreal forests and has been attributed to changes in site conditions. However, it is unknown if the mechanisms controlling fire-induced changes in deciduous hardwood cover are similar among different boreal forests, which differ in the ecological traits of the dominant tree species. To better understand the consequences of intensifying fire regimes in boreal forests, we studied postfire regeneration in five burns in the Central Siberian dark taiga, a vast but poorly studied boreal region. We combined field measurements, dendrochronological analysis, and seed-source maps derived from high-resolution satellite images to quantify the importance of site conditions (e.g., organic layer depth) vs. seed availability in shaping postfire regeneration. We show that dispersal limitation of evergreen conifers was the main factor determining postfire regeneration composition and density. Site conditions had significant but weaker effects. We used information on postfire regeneration to develop a classification scheme for successional pathways, representing the dominance of deciduous hardwoods vs. evergreen conifers at different successional stages. We estimated the spatial distribution of different successional pathways under alternative fire regime scenarios. Under intensified fire regimes, dispersal limitation of evergreen conifers is predicted to become more severe, primarily due to reduced abundance of surviving seed sources within burned areas. Increased dispersal limitation of evergreen conifers, in turn, is predicted to increase the prevalence of successional pathways dominated by deciduous hardwoods. The likely fire-induced shift toward greater deciduous hardwood cover may affect climate-vegetation feedbacks via surface albedo, Bowen ratio, and carbon cycling.

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Ground seed density patterns under conditions of strongly overlapping seed shadows in Abies alba Mill. stands

Cited by 18 publications

References 40 publications

Local seed dispersal in European silver fir (Abies alba Mill.): lessons learned from a seed trap experiment

Local seed dispersal in European silver fir (Abies alba Mill.): lessons learned from a seed trap experiment

Interspecific effects between overstorey and regeneration in small-scale mixtures of three late-successional species in the Western Carpathians (southern Poland)

Dispersal limitation drives successional pathways in Central Siberian forests under current and intensified fire regimes

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