Semi-natural mesic grasslands of Bystrytsya valley (Ukrainian Carpathians)

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作   者：

Milan Zajac;  Roman Kish;  Anna Kuzemko;  Janka Smatanova;  Iveta Skodova; 

作者机构：

Slovakia;  National Academy of Science of Ukraine;  Uzgorod National University;  National Dendrological Park Sofiyvka;  Uman;  Institute of Botany;  Faculty of Biology;  Administration of Landscape protected area Strazovske vrchy Mts.;  Bratislava;  Ukraine;  Uzgorod;  Povazska Bystrica;  Slovak Academy of Sciences; 

关键词：

Arrhenatherion elatioris;  Violion caninae;  syntaxonomical classification;  meadows;  Nardo strictae-Agrostion tenuis;  Cynosurion cristati;  semi-supervised methods;  pastures; 

期刊名称：

Thaiszia: Journal of Botany

i s s n：

1210-0420

年卷期：

2016 年 26 卷 2 期

页   码：

91-123

页   码：

摘   要：

We present the syntaxonomic overview of semi-natural mesic grassland communities (Arrhenatheretalia elatioris and Nardetalia strictae orders) from the Bystrytsya Nadvirnianska river valley in the Ukrainian Carpathians. We collected 55 phytosociological releves in the 2015 vegetation season using Braun-Blanquet approach. Analyses were conducted by semi-supervised K-means classification method and detrended correspondence analysis. Seven grassland types in four alliances were distinguished in the dataset. The Arrhenatherion elatioris alliance involved two associations. Unploughed, regularly long-term mown and sometimes extensively grazed grasslands of the Anthoxantho odorati-Agrostietum tenuis association were more frequent than Poo-Trisetetum flavescentis association developing on fallows (former arable fields). The intensive pastures classified as the Lolio perennis-Cynosuretum cristati association of the Cynosurion cristati alliance were rarely recorded, while the oligotrophic pastures of Violioncaninae alliance were more frequent. They consisted of one well differentiated association of semi-wet extensively grazed grasslands of the Polygalo vulgaris-Nardetum strictae association and mesophilous communities forming transitions from Hyperico maculate-Deschampsietum flexuosae, Campanulo rotundifoliae-Dianthetum deltoidis and associations to the Nardo strictae-Agrostietum tenuis alliance. Extensively grazed and often mown grasslands of Campanulo abietinae-Nardetum strictae association and extensive pastures of the Antennario dioicae-Nardetum strictae association belonging to the Nardo strictae-Agrostion tenuis alliance were recorded in higher altitudes. Didukh's indicator values (DIV) and altitude were used to ecological differentiation of classified grassland types. The main environmental gradient was related to altitude and soil parameters, especially soil acidity and nutrient content (nitrogen) onthe first ordination axis and to soil humidity on the second ordination axis.