文章基本信息

标题：CROWNS OF OLD REMNANT OAK STANDARDS
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作者：Lubomir Salek ; Ahmet Sivacioglu ; Osman Topacoglu 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2017
卷号：26
期号：6
页码：4023-4032
语种：English
出版社：PSP Publishing
摘要：After abandoning the silvicultural system cop-pice-with-standards in the year 1950, the crown of standards developed gradually under the growing influence of their competitors. This study examines the crowns of remnant oak standards in two forest types, in riparian forest in lowland along big river (SET 1) and in upland forest on rich soils (SET 2) in the eastern part of the Czech Republic. In each locality 100 oak standards were randomly selected and the basic mensurational data as well as some ecological data, such as number of big dead branch-es, hollows, and heights of the lowest big dead and green branches were measured. Crown distances were measured in 8 octants starting from the north. For each standard, four closest competitors were found and their height, distance and azimuth were measured. The dbh of the analysed standards ranged between 71 and 148 cm and the projected crown area between 125 and 533 m2 in SET 1, dbh between 56 and 107 cm and projected crowns between 83 and 362 m2 in SET 2. To assess competitive pressure, an index as the ratio between tangent of angles of regular and compressed crowns were calculated. Every standard crown included at least one big dead branch, their average number in SET 1 was 8.3 and in SET 2 5.95. In SET 1 the most competitive tree species are Fraxinus excelsior, Alnus glutinosa and Populus sp., in SET 2 Quercus petraea, Carpinus betulus, Tilia cordata and Larix decidua.
关键词：Biodiversity;crown;oak;projection;standards