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6
Content available Model wzrostu dla drzewostanów dębu szypułkowego
75%
EN
Old Common Oaks (Quercus robur L.), often connected with myths and legends, are the largest trees occurring in Central Europe. The present paper describes twelve largest girthed specimens of the species growing in Poland. Authors, based on their own measurements and researches, prepared a ranking list of these unique trees and estimated their health condition. Moreover, their exact localizations in Mielno, Bąkowo, Piotrowice, Kadyny, Januszkowice, Zagnańsk, Rogalin, Nogat, Węglówka, Młock, Rudka and Karczmiska were described and most popular facts and stories from their history were given. The largest girthed Common Oak in Poland is “Napoleon” growing in Mielno (1042,5 cm in circumference), the second one is the oak from Bąkowo (1020 cm) and the third – “Chrobry” from Piotrowice. In total in Poland there are three specimens of Common Oaks with trunk circumference of more than 1000 cm, and five more with circumference between 900 and 1000 cm.
11
Content available Debowe drzewostany nasienne w Nadlesnictwie Runowo
75%
PL
Dęby Rogalińskie stanowią największe skupisko starych dębów szypułkowych w Polsce i jedno z największych w Europie. Rosną one w okolicach Rogalina w rozleglej, płaskiej dolinie Warty, na odcinku od Rogalina do Świątnik po prawej i lewej stronie rzeki. Celem pracy była dokładna inwentaryzacja populacji starych dębów tworzących na tym terenie interesujący i unikalny krajobraz. Wszystkie drzewa (o obwodzie minimum 200 cm, mierzonym na wysokości 1,3 m od powierzchni ziemi) zostały zmierzone, opisane i naniesione na mapę. Ogółem odnotowano 1435 drzew. Wśród nich 284 to dęby pomnikowe o obwodzie powyżej 360 cm.
EN
Rogalin Oaks is the largest concentration of old Common oaks in Poland and one of the largest in Europe. They stand in Rogalin and its countryside from Rogalinek to Świątniki in the widespread valley of Warta River on both banks of the river. Tire aim of the study was a precise listing of population of old oaks which make an interesting and unique landscape. All trees (over 200 cm circumference at the breast height) were measured, described and pointed at the map. 1435 individuals were recorded in this area. 284 of them are Monuments of Nature (over 360 cm circumference).
EN
The aim of the study was to investigate the structure of forest site types and of soil types of oak seed stands in Poland. The study was comparatively conducted with reference to sessile (Quercus petraea) and common (Q. robur) oaks. As in Poland the seed stands are established only in stands characterized by favourable both growth parameters and timber quality, it was suspected that the results of the study would enable to indicate optimal sites and soil units for oak breeding in Poland. The study was conducted on the basis of data obtained from the SEMEN database (www.bnl.gov.pl) which were broadened by descriptions of the investigated seed stands found in the Forest Data Bank (www.bdl.lasy.gov.pl). For both oak species, the research was conducted with reference to the two types of seed stands: permanent (WDN) and temporary (GDN). In total, 531 stands of Quercus petraea and 2043 of Q. robur located across whole Poland were investigated in the study. It was found that optimal soils as well as forest site types overlap for both investigated oak species only for fresh broadleaved forest (Lśw). For other forest type sites distinct differences for the oak species were found. The optimum for common oak were expanded towards the wet sites (moist broadleaved forest – Lw, and riparian forest – Lł), while for sessile oak towards semi−fertile mixed broadleaved forest (LMśw). It is interesting that seed stands of both oak species overgrow not only fine−textured soils, but significant share of them (ca. 50% area of Q. petraea and 15% of Q. robur seed stands) occurs on sandy soils (Brunic Arenosols mainly). It proves that Brunic Arenosols constitute forest sites enabling production of broadleaved forests characterized by favourable growth parameters and high timber quality. However, it is possible unless the soil have been podzolized by conifers due to podzolized Brunic Arenosols were rarely represented in the oak seed stands and, if so, the stands were characterized by relatively low site index. It was also stated that on podzolized Brunic Arenosols of fresh mixed coniferous forest (BMśw) admixture of oak should enable reducing negatively impact of conifers on a soil.
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