tailieunhanh - Báo cáo lâm nghiệp: " Relationships between browsing damage and woody species dominance"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Relationships between browsing damage and woody species dominance. | JOURNAL OF FOREST SCIENCE 55 2009 1 23-31 Relationships between browsing damage and woody species dominance P. Cermák P. Horsák M. Spirik R. Mrkva Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT The paper analyzes data on browsing damage to food-attractive woody species viz. Acer campestre Acer pseudoplatanus Acerplatanoides Fraxinus excelsior Sorbus aucuparia and most often eudominant Fagus sylvatica. The field survey was carried out in 2005-2007. Analyzed data come from 34 transects at 15 localities in the CR with different abundance of ungulates Capreolus capreolus in some areas also Cervus elaphus or Dama dama . Trees occurring in natural regeneration under a stand were monitored up to a height of 150 cm and the presence of new browsing damage was monitored. Differences between the percent of damaged individuals of the given species of a food-attractive woody species and the percent of damaged individuals of all woody species in the transect as well as the proportion of these parameters significantly correlate with the dominance of the given species being suitable parameters for the analysis of a relationship between the intensity of damage and dominance. At the same time the higher the proportion of Fagus sylvatica the higher the relative intensity of damage to monitored food-attractive species. Keywords browsing dominance Acer Fraxinus excelsior Sorbus aucuparia Fagus sylvatica The intensity of browsing damage to particular tree species by ungulates is always dependent on a broad spectrum of factors. In addition to the abundance of browsing animals site properties and properties of woody species the species composition of trees in advance regeneration plays also an important role different attractiveness of particular species as well as the density of this advance growth different amounts of biomass for consumption difficult access to seedlings etc. . A markedly selective character of