Temat: tree diversity - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An assessment of genetic diversity following natural regeneration of Sorbus torminalis in the Forest District of Jamy (northern Poland)
Autorzy:: Bednorz, L.
Myczko, L.
Kosinski, P.
Powiązania:: https://bibliotekanauki.pl/articles/41322.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: assessment
genetic diversity
natural regeneration
Sorbus torminalis
conservation
wild service tree
Forest District Jamy
Polska
Opis:: The subject of the study was a population of Sorbus torminalis resulting from spontaneous regeneration from seeds in northern Poland at the north-eastern limit of the species distribution. The population, occupying a fenced plot of 1.72 ha in the Forest District of Jamy, amounted to 579 individuals of variable age classes up to about 19 years old. Six polymorphic gene loci: MDH-B, ME-A, 6PGD-B, ADH-B, PGM-A, PGM-B were studied in 532 individuals recruited post-fencing and 21 potentially parental, adult trees. The analysis showed similarly high levels of genetic diversity within both subsets of individuals but there was also a noticeable change in genetic structure between them. Detailed genetic analysis of the post-fencing recruits revealed lack of significant differences between different age groups based on DBH within the fenced plot.
Źródło:: Dendrobiology; 2015, 73
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Changes in plant species composition in abandoned and restored limestone grasslands - the effects of tree and shrub cutting
Autorzy:: Dzwonko, Z
Loster, S.
Powiązania:: https://bibliotekanauki.pl/articles/57086.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Botaniczne
Tematy:: cutting
Polska
grassland
secondary succession
restoration
species diversity
species composition
tree
composition change
plant species
shrub
time series
botany
permanent plot
Opis:: Abandoned semi-natural limestone grasslands are often overgrown by shrubs and trees. Little is know if and to what extant xerothermic limestone grasslands can be restored by tree cutting. This was tested in a 12-year experiment after the clearing of a 35-year-old secondary pine wood developed on unmanaged grassland in the close proximity of not overgrown old grassland. After 12 years, there were no significant differences in the number of field layer species on the plots in the old and restored grasslands. But over this period the number of meadow species increased in all sites, while the number of xerothermic calcareous species increased significantly only in the old grassland plots. The developing shrub layer negatively influenced the number of nitrophilous and ruderal species in grasslands restored in the former close and open woods, and the number of all species, including the number of non-tufted perennials and perennials with vegetative spread, in the former open wood. The number of meadow species increased in years with higher precipitation in late spring and early summer. The obtained results suggest that in overgrowing grasslands shrubs and trees should be cut every few years, before their covers increase to about 30%. However, this treatment alone will not stop the changes to communities with dominance of tall and vegetatively spreading grasses and forbs. Cutting trees and shrubs in sites where most grassland species have already vanished, without additional managements supporting their dispersal, seedling recruitment and development, is not sufficient to restore limestone grasslands rich in xerothermic species.
Źródło:: Acta Societatis Botanicorum Poloniae; 2008, 77, 1
0001-6977
2083-9480
Pojawia się w:: Acta Societatis Botanicorum Poloniae
Dostawca treści:: Biblioteka Nauki

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