Structure of silver fir (Abies alba Mill.) natural regeneration in the `Jata' reserve in Poland

Dobrowolska, Dorota

doi:10.1016/s0378-1127(98)00286-2

Cited by 61 publications

(53 citation statements)

References 11 publications

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“…This phenomenon is clear in well-structured old forests, with spatially homogeneous dense groups and/or large individuals, in particular at short distances (tens of meters). A similar process was not observed in Greece, where present stand status does not represent the conditions where yew individuals were established , but it has been pointed out for yew forests of Central Europe (Hulme 1996;Dovciak 2002), in holly (Ilex aquifolium L.) populations (Arrieta and Suarez 2006), and it is like the phenomenon of reciprocal replacement found in mixed European beech-silver fir forests (Dobrowolska 1998). Considering yew requirements in terms of light availability, in particular when it reaches the sapling stage (Iszkuło and Boratyński 2006), Taxus baccata "woods" might be dynamically related to the senescent phase of beech forests (Peterken 1996), which favours overstorey gaps formation useful to yew saplings exploitation (Hageneder 2007;Piovesan et al 2009;.…”

Section: Discussionmentioning

confidence: 54%

Natural regeneration and gender-specific spatial pattern of Taxus baccata in an old-growth population in Foresta Umbra (Italy)

Vessella¹,

Salis²,

Scirè³

et al. 2015

Dendrobiology

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English yew is rare and endangered dioecious species. Research on regeneration processes of endangered taxa is important to understand the mechanisms allowing a species to survive under several ecological scenarios, to predict future distribution shifts, to achieve best management practices and conservation policies. Our investigation was focusing on one of the oldest yew population in Europe, in Foresta Umbra in Italy. The main aim of this study was to understand spatial regeneration processes and dynamics related with parent trees' sex distribution.Geostatistical analysis showed that seedlings occur in patches avoiding direct competition with adult yews. Negative relationship between regeneration and yew density and basal area was found.A general model for the reproductive ecology is proposed: females are less competitive and more environmentally demanding than males, because of their reproductive effort. Indeed, male and female fitness responds differently across environmental gradients, thus favouring spatial segregation of seedlings. Understanding the yew's adaptive effectiveness is essential to ensure the conservation of existing populations, and encourage the species' resilience into areas where yew is endangered.

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Section: Discussionmentioning

confidence: 54%

Natural regeneration and gender-specific spatial pattern of Taxus baccata in an old-growth population in Foresta Umbra (Italy)

Vessella¹,

Salis²,

Scirè³

et al. 2015

Dendrobiology

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“…Therefore, the considerable site variability in the Reserve of Sasso Fratino also plays a crucial role in the distribution of the species in the regeneration layer. Moreover, the nat ural regeneration of silver fir is also affected by the proportion of fir seed bearer trees in the stand surrounding the gap, as observed for mixed silver fir stands of central Europe (Dobrowolska 1998, Dobrowolska & Veblen 2008.…”

Section: Discussionmentioning

confidence: 83%

Structure and dynamics of a beech forest in a fully protected area in the northern Apennines (Sasso Fratino, Italy)

Bianchi¹,

Bottacci²,

Calamini³

et al. 2011

iForest

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Sasso Fratino Nature Reserve (National Park of Casentino Forests, northern Apennines) is a quite rare example of natural Apennine forest. The Reserve was established in 1959, aiming to protect a forest, although not a virgin one, low-intensively disturbed in the past by comparison with other neighbouring stands. Causes of such a low disturbance are the very limited accessibility of the area due to the very steep slopes characterising the site morphology, as well as historical features. The forest is a pure beech stand from 1250 m a.s.l. upwards, below this altitude is a mixed beech and silver fir forest. The study focuses on the understanding of the processes driving the evolution of the forest in the absence of human activities. To achieve this goal, 9 permanent, long-term research plots were established at different altitudes, in order to investigate on forest dynamics and regeneration processes. Simplified (single-layer) stand structures are more frequent where canopy gaps are absent. Two-layered structures are the result of the occurrence of canopy gaps, which allow the settlement, and subsequently the establishment, of a lower regeneration layer. Where the gap dimensions allow canopy closure, this kind of structure persists. When the gaps are quite large, the regeneration layer reaches the top layer and the structure stand tends, once more, toward a single-layer. Multilayered structures are extremely rare at plot level and become evident only at a wider scale. Our surveys indicate also a high variability of tree diameter distribution patterns in the forest stands. Such variability could be strictly related to the heterogeneity of site characteristics as well as to the effects of disturbance factors (both natural and anthropic). Concerning altitude, we observed an increase both of site index (dominant height) and species diversity in the regeneration layer, moving from higher (1500 m) to lower (900 m) altitudes. As a whole, our observations show that the dynamics of forest vegetation in the reserve is mostly affected by the interruption of tree canopy continuity. This implies substantial local variations of PAR in space and in time, which determine favourable ecological conditions for: (a) survival and growth of beech seedlings, or release of advanced beech regeneration; and (b) release of advanced silver fir regeneration (fir, more shade tolerant than beech, regenerates mainly in locations and conditions where the broadleaf saplings cannot survive for lack of light). The knowledge of the mechanisms of vegetation dynamics in the Reserve can be used to form the basis of close-to-nature silvicultural choices in similar stands in order to increase functionality and stability. Periodical monitoring of RNI will allow the investigation of the evolutionary trends of the forest stands

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“…They include both climatic factors such as temperature, humidity and radiation regimes during the growing season, and soil factors such as soil moisture, depth of the humus layer and soil texture, which affect water and nutrient availability at the soil surface and in the soil horizon (Rojo and Montero 1996). Topography, which influences temperature and water regimes (Madsen and Larsen 1997), understory cover (Dobrowolska 1998;Kitzberger 2000) and the formation of a soil seed bank (Enrico et al 2004) also significantly affect the establishment and survival of tree seedlings. The impact of herbivores (Paluch 2005), pathogens (Auspurguer 1983) and competition with grass (De Steven 1991) can hinder regeneration success.…”

Section: Introductionmentioning

confidence: 99%

Environmental influences on post-harvest natural regeneration of Pinus pinaster Ait. in Mediterranean forest stands submitted to the seed-tree selection method

2010

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Background:Research on natural regeneration is crucial for the development of sustainable forestry practices, in light of the global climate changes taking place. In this study one hundred and fifty-one plots were sampled in six Pinus pinaster stands that were naturally regenerated by the seed-tree method in Mediterranean forests in central Spain. Objective:The objectives of the survey were to study the suitability of different forest stands designated for natural regeneration as well as to analyse seedling establishment and the relationship between regeneration and different site factors. Analysis of variance (ANOVA) and multivariate analysis with canonical ordination techniques were employed. Full and partial redundancy analyses (RDAs) on a correlation matrix were used to carry out a direct gradient analysis of regeneration density as a function of site factors.Results: Nearly all stands presented seedling densities over 2000 seedlings/ha and were thus found to be suitable for natural regeneration of Pinus pinaster by the seed-tree selection method. Significant variables that best explained total seedling and viable seedling density were spring and autumn precipitation of the year prior to establishment, spring and summer precipitation of the year of establishment, and percentage cover of litter. There were no signs of competition between shrubs and seedlings, but a negative significant correlation with grass cover was observed. Pinus pinaster natural regeneration was successful with the seed-tree method, although it appeared to be highly dependent on climate and stand conditions.

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Structure of silver fir (Abies alba Mill.) natural regeneration in the `Jata' reserve in Poland

Cited by 61 publications

References 11 publications

Natural regeneration and gender-specific spatial pattern of Taxus baccata in an old-growth population in Foresta Umbra (Italy)

Natural regeneration and gender-specific spatial pattern of Taxus baccata in an old-growth population in Foresta Umbra (Italy)

Structure and dynamics of a beech forest in a fully protected area in the northern Apennines (Sasso Fratino, Italy)

Environmental influences on post-harvest natural regeneration of Pinus pinaster Ait. in Mediterranean forest stands submitted to the seed-tree selection method

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