%0 Journal Article
%T Verhulitsa-Lutep   piirkonna liivikute taimkattest
%A Jaanus Paal
%A Kaie Kurg
%A Taimi Paal
%J Forestry Studies / Metsanduslikud Uurimused
%@ 1736-8723
%D 2008
%I 
%R 10.2478/v10132-011-0065-y
%X Vegetation of inland sand knobs in South-Eastern Estonia was studied in four areas (Table 1). All in all 39 plant communities were described including 4 species in tree and srub layers, 22 species in field layer and 19 species in bottom layer. Though in the majority of communities Cladina arbuscula and Festuca ovina dominated, according to the cluster analysis dendrogram (Figure 1) the communities were classified into 7 syntaxonomic units (Table 2): 1. Calluna vulgaris-Cladina spp. type, 2. Koeleria glauca-Cladina spp. type, 3. Juniperus communis-Arctostaphylos uva-ursi-Cladina spp. type, 4. Festuca ovina Cladina spp. type, 4.1. Pinus sylvestris-Festuca ovina-Cladina spp. type, Deschampsia flexuosa variant, 4.2. Pinus sylvestris-Festuca ovina-Cladina spp. type, Thymus serpyllum variant, 4.3. Pinus sylvestris-Festuca ovina-Cladina spp. type, Pleurozium schreberi variant. The established types and their variants differ essentially according to the abundance proportions between the species and usually every type has reliable indicator species (Table 2). On the CCA ordination biplot (Figure 2) the considered types are well separated from each other. Environmental variables determining the variation structure of samples are first of all the amount of litter and the total cover of field and moss layers. The former environmental variables together with the total cover of tree and shrub layers and communities mean area separate the community types according to the discriminanat function analysis (Table 3). The most species-rich are the communities of Thymus serpyllum variante of Cladina spp.-Festuca ovina-Pinus sylvestris type including altogether 29 species. The species richness of communities depends mostly on the amount of litter and marginally insignificantly (p = 0,051) also on humus horizon thickness (Table 4). Interpreting the vegetation on 1กม1 m sample quadrats as representing microcoenoses, 415 quadrats were clustered into 23 microcoenose types, many of which are characterized by dominance of Cladina arbuscula and/or Festuca ovina. However the abundance proportions of these species are again different and also various co-dominating species separate microcoenose types (Table 5). The average number of species does not exeed 7 in microcoenoses of any type, usually it is 3-5. The most frequent are the microcoenoses of Cladina arbuscula+Pycnothelia papillaria, Cladina arbuscula+Festuca ovina, Festuca ovina+Cladina arbuscula and Festuca ovina+Pilosella officinarum type, seldom microcoenoses of Cetraria islandica+Cladina stellaris and Polytrichum piliferum+Festuca ovina type occur. In all community types Cladina arbuscula+Festuca ovina and Dicranum polysetum+Cladina arbuscula type microcoenoses are presented (Table 6). At the same time, microcoenoses of any type are confined to only one type of communities. Still it appears that the microcoenoses of Cladina arbuscula+Nardus stricta and Cladina arbuscula+Koeleria glauca type are not more represented in
%K afforestation
%K community types
%K communities maintenance
%K inland sands
%K microcoenoses
%U http://versita.metapress.com/content/e37037l63230j717/?p=3ae6d243948b400f8e01ca1caad19f5e&pi=7