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Maciej Skorupski - One of the best experts on this subject based on the ideXlab platform.
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Impacts of soil conditions and light availability on natural regeneration of Norway spruce Picea Abies (L.) H. Karst. in low-elevation mountain forests
Annals of Forest Science, 2018Co-Authors: Marcin K. Dyderski, Anna Gazda, Mariusz Hachułka, Paweł Horodecki, Izabela L. Kałucka, Jacek Kamczyc, Marek Malicki, Remigiusz Pielech, Michał Smoczyk, Maciej SkorupskiAbstract:Abstract• Key messageNatural regeneration ofP. Abies(L.) H. Karst. may reach high densities in lower mountain elevations. The highest densities were found in sites with moderate light availability, with low pH, and not near the riverbank. However, age-height classes differed in the predicted magnitude of response, but were consistent in response directions. Mosses and understory species typical of coniferous forests were positively correlated with regeneration density.• ContextNorway spruce Picea Abies (L.) H. Karst. in Central Europe is at risk under climate change scenarios, particularly in mountain regions. Little is known about the impact of environmental factors on the natural regeneration of P. Abies in low-elevation mountain forests.• AimsWe aimed to assess impacts of distance from the riverbank, soil pH, and light availability on natural P. Abies regeneration. We hypothesized that (1) natural P. Abies regeneration would depend on light availability and soil pH and (2) there are understory plant species which may indicate the microsites suitable for natural regeneration of P. Abies.• MethodsThe study was conducted in the Stołowe Mountains National Park (SW Poland, 600–800 m a.s.l.). We established 160 study plots (25 m2) for natural regeneration, light availability, soil pH, and understory vegetation assessment.• ResultsThe highest densities of natural regeneration of P. Abies were observed in sites with moderate light availability (0.1–0.2 of open sky) and low pH (3.5–4.5), and located relatively far from the riverbank. Cover of 22 understory plant species were correlated with natural P. Abies regeneration densities, mostly positively.• ConclusionDifferent stages of natural regeneration of P. Abies revealed different regeneration niches. Most understory plant species (bryophytes and herbs typical of coniferous forests) do not compete with natural regeneration of P. Abies.
Azize Toper Kaygin - One of the best experts on this subject based on the ideXlab platform.
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Scale insects of the conifer trees in Turkey and their zoogeographical distribution
Journal of Pest Science, 2004Co-Authors: Selma Ülgentürk, Hasan Çanakçioğlu, Azize Toper KayginAbstract:In Turkey, 25 species of Coccoidea (Homoptera) are recorded on Conifera tree species. The family Diaspididae has 15, Coccidae 6, Pseudococcidae 3, and Margarodidae 1 species. Specifically, Dynaspidiotus spp. are recorded on Abies, Cedrus, Picea, and Pinus ; Leucaspis spp. on Pinus spp.; Carulaspis spp. on Biota, Cupressus, Juniperus, and Thuja; Lepidosaphes spp. on Abies, Biota, Juniperus, and Picea; Coccus spp. on Abies, Cedrus, and Pinus; and Planococcus spp. on Cupressus, Juniperus, and Pinus species. Acanthomytilus cedricola is recorded only on Cedrus spp.; Physokermes piceae on Abies and Picea species; and Marchalina hellenica only on Pinus species. Two species are Native, five are Cosmopolitan, 15 are Palaearctic, and 3 are of Mediterranean origin.
Marcin K. Dyderski - One of the best experts on this subject based on the ideXlab platform.
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Impacts of soil conditions and light availability on natural regeneration of Norway spruce Picea Abies (L.) H. Karst. in low-elevation mountain forests
Annals of Forest Science, 2018Co-Authors: Marcin K. Dyderski, Anna Gazda, Mariusz Hachułka, Paweł Horodecki, Izabela L. Kałucka, Jacek Kamczyc, Marek Malicki, Remigiusz Pielech, Michał Smoczyk, Maciej SkorupskiAbstract:Abstract• Key messageNatural regeneration ofP. Abies(L.) H. Karst. may reach high densities in lower mountain elevations. The highest densities were found in sites with moderate light availability, with low pH, and not near the riverbank. However, age-height classes differed in the predicted magnitude of response, but were consistent in response directions. Mosses and understory species typical of coniferous forests were positively correlated with regeneration density.• ContextNorway spruce Picea Abies (L.) H. Karst. in Central Europe is at risk under climate change scenarios, particularly in mountain regions. Little is known about the impact of environmental factors on the natural regeneration of P. Abies in low-elevation mountain forests.• AimsWe aimed to assess impacts of distance from the riverbank, soil pH, and light availability on natural P. Abies regeneration. We hypothesized that (1) natural P. Abies regeneration would depend on light availability and soil pH and (2) there are understory plant species which may indicate the microsites suitable for natural regeneration of P. Abies.• MethodsThe study was conducted in the Stołowe Mountains National Park (SW Poland, 600–800 m a.s.l.). We established 160 study plots (25 m2) for natural regeneration, light availability, soil pH, and understory vegetation assessment.• ResultsThe highest densities of natural regeneration of P. Abies were observed in sites with moderate light availability (0.1–0.2 of open sky) and low pH (3.5–4.5), and located relatively far from the riverbank. Cover of 22 understory plant species were correlated with natural P. Abies regeneration densities, mostly positively.• ConclusionDifferent stages of natural regeneration of P. Abies revealed different regeneration niches. Most understory plant species (bryophytes and herbs typical of coniferous forests) do not compete with natural regeneration of P. Abies.
F Pellissier - One of the best experts on this subject based on the ideXlab platform.
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effects of vaccinium myrtillus on spruce regeneration testing the notion of coevolutionary significance of allelopathy
Journal of Chemical Ecology, 2000Co-Authors: Azim U Mallik, F PellissierAbstract:Failure of natural regeneration of conifers, such as subalpine spruce (Picea Abies) and black spruce (Picea mariana), has been reported in the presence of dominant ericaceous understory plants of boreal forests of North America, Fino-Scandinavia, and northern Europe. Among other factors such as competition for light and nutrients, conifer regeneration failure has been attributed to allelopathic effects of the understory ericaceous plants. Rabotnov theorized that (the manifestation of) allelopathy is a result of long-term coevolution within established plant communities and that it may have maximum inhibitory effects on introduced species. Our objectives were to determine what components of the understory ericaceous plant, Vaccinium myrtillus, affect spruce regeneration and to test Rabotnov's hypothesis. Field experiments were complemented with laboratory studies in which seed germination and primary growth of the two spruces were used as response variables. We found that P. mariana was generally more affected than P. Abies by V. myrtillus allelochemicals, both in field and in vitro experiments. Field germination of P. Abies was only 2% and 3% in the undisturbed sowed plots and in Vaccinium-removed sowed plots, respectively, but P. marana did not germinate at all in these treatments. In humus-removed sowed plots, P. Abies had 27% germination, while P. marian had only 15%. In a controlled experiment, P. mariana had the highest decrease in dry weight of primary root in the fresh leaf treatment of V. myrtillus (77%), followed by its leaf leachate (71%), humus (29%), and humus leachate (13%). The decreases in root dry weights of P. Abies due to these treatments were 67, 47, 30, and 10%, respectively. Our results provide support for Rabotnov's hypothesis. It is possible that both V. myrtillus and Kalmia angustifolia, involved in the growth inhibition process of P. Abies and P. mariana, respectively adopted similar "strategies" of allelopathic inhibition of conifers, by allocating a large part of their carbon pool to the production of secondary metabolites.
Inger Hakman - One of the best experts on this subject based on the ideXlab platform.
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Embryogenic culture initiation and somatic embryo development in hybrid firs (Abies alba x Abies cephalonica, and Abies alba x Abies numidica).
Plant cell reports, 1996Co-Authors: Terezia Salajova, Andrej Kormutak, Jan Jasik, Jan Salaj, Inger HakmanAbstract:Embryogenic cultures were established from silver fir (Abies alba Mill.) female megagametliophytes with developing embryos and from excised mature embryos after pollination with Abies cephalonica Lond. or Abies numidica DeLann pollea The frequency of embryogenic callus formation was dependent on genotype, collection time, medium and explants used. The embryogenic callus initiation potential of megagamethophytes with developing embryos in both hybrids was higher in early July and dropped as the zygotic embryos matured. Excised cotyledonary embryos were less suitable for induction of embryogenic cultures. SH medium supplemented with 1mg/l BAP was the most efficient for callus induction and maintenance. Cultures were composed of early somatic embryos with an embryonal mass formed of highly cytoplasmic cells, rich in cell organelles and a suspensor built up by vacuolated, strongly elongated cells. Maturation of embryos was detected with the formation of bipolar structures with shoot and root apices. Nutrition reserves were observed in cells of embryos cultured on DCR medium containing 1 or 10 mg/l ABA. Cotyledon formation, hypocotyl elongation and low frequency germination occured following transfer of the embryos to the same medium without ABA.