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Phytosociological Characteristics of Seven Poorly Known Associations of Serpentine Rocky Grassland Vegetation of the Order Halacsyetalia Sendtneri in Serbia

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Phytosociological Characteristics of Seven Poorly Known Associations of Serpentine Rocky Grassland Vegetation of the Order Halacsyetalia Sendtneri in Serbia 41 (2): (2017) 221-247 Original Scientific Paper Phytosociological characteristics of seven poorly known associations of serpentine rocky grassland vegetation of the order Halacsyetalia sendtneri in Serbia Slobodan Jovanović✳, Eva Kabaš, Nevena Kuzmanović, Ksenija Jakovljević, Snežana Vukojičić, Dmitar Lakušić University of Belgrade, Faculty of Biology, Institute of Botany and Botanical Garden, Takovska 43, 11000 Belgrade, Serbia ABSTRACT: Although it is well known that dry open rocky grassland vegetation on shallow serpentine (ultramafic) soils represents one of the most interesting, highly endemic, and often studied vegetation types, the authors of several detailed studies of Balkan serpentine flora and vegetation suggested that the vegetation cover of Balkan ultramafics needs further exploration due to its heterogeneity. In this article, phytosociological characteristics of seven poorly known associations of grassland communities from the order Halacsyetalia sendtneri are analysed. In order to provide additional descriptions of these communities (with diagnosis and lists of diagnostic, dominant, and constant species), check their phytosociological validity, and confirm their syntaxonomical position, the stands of these communities were compared with 18 associations distributed throughout the area of serpentine outcrops in Bosnia and Herzegovina and Serbia. The results of cluster analysis confirmed that the analysed heretofore poorly known associations in the vegetation of open rocky serpentine grasslands are floristically well-defined. Keywords: Balkan Peninsula, numerical analyses, phytosociology, syntaxonomy, serpentine, ultramafic grasslands Received: 12 April 2017 Revision accepted: 18 August 2017 UDC: 581.54:57.081(497.11) DOI: INTRODUCTION Hayek (1923), Markgraf (1926, 1931), Nyárády (1927), Novak (1928), Rechinger (1957), etc. Later Despite the fact that different types of ultramafic papers include more comprehensive studies focusing (including serpentine) rocks represent only a negligible on floristics and florogenesis, ecophysiological aspects fraction (less than 1%) of the Earth’s surface (Brooks of the ultramafic flora and vegetation, and geological 1987), they have been of great interest to researchers and edaphic properties of the ultramafic substrate itself: since the middle of the 19th Century. This type of rocks Pichi-Sermolli (1948), Kruckeberg (1951, 1954, 1967, and their effects on flora and vegetation have held 1985), Walker (1954), Whittaker (1954), Tadros special interest for European botanists, particularly in (1957), Proctor & Woodell (1975), Karataglis et the Balkans, since the largest continuous ultramafic al. (1982), Reed (1986), Brooks (1987), Vergnano- areas in Europe are present there (Brooks 1987). Gambi (1992), Chiarucci et al. (1995), Stevanović et Interest in the topic began to be shown in a number al. (2003), Kazakou et al. (2008), Brković et al. (2015). of classical papers dealing with the ultramafic (i.e., Interest in the serpentine flora and vegetation has serpentine) flora of the Balkan Peninsula: Grisebach continued to grow, and numerous papers have served as (1843), Pančić (1859), Beck (1901), Malý (1908, 1910), a solid basis for further studies of vegetation found on Adamović (1909), Janchen (1920), Jávorka (1921), ultramafic substrates. During the second half of the 20th ✳correspondence: [email protected] © 2017 Institute of Botany and Botanical Garden Jevremovac, Belgrade 222 vol. 41 (2) Century, research was carried out almost simultaneously further exploration due to its heterogeneity (Tatić in the Balkan countries, mainly in Serbia and Bosnia & Veljović 1992; Jakovljević et al. 2011; Aćić et and Herzegovina. al. 2014). Accordingly, the aims of this paper were to The first vegetation studies on ultramafics of the provide phytosociological tables, accurate diagnosis, Central Balkan Peninsula dealt with rocky dry grassland and floristic and ecological data of seven poorly vegetation in the mountains of Serbia (Pavlović 1951, known serpentine dry grassland associations in Serbia, 1953, 1955a, b; Kojić & Ivanović 1953; Cincović & including Kosovo. Six of them are associations whose Kojić 1955, 1956). Synthetic papers on serpentine plant invalid names were regularly quoted in several national associations of Bosnia and Herzegovina were published reviews of the plant communities in Serbia (Kojić et al. not long after Krause( & Ludwig 1956, 1957; Krause et 1998; Kojić et al. 2004; Lakušić & Sabovljević 2005) al. 1963). Subsequently, Blečić et al. (1969) published an and were validated in a recent nomenclatural revision of important study on the specifics of the grassland flora dry grassland syntaxa of the Central Balkans (Aćić et and vegetation of Kosovo and Metohija, and three new al. 2014). Also, we here give a formal description of one associations were published and included within the new association, provisionally named by Kuzmanović et alliance Centaureo-Bromion fibrosi Blečić et al. 1969. al. the Carici kitaibelianae–Euphorbietum glabriflorae One year later, as a result of research on serpentine association (Kuzmanović et al. 2016). rocky grasslands of Bosnia and Herzegovina, Ritter- Studnička (1970) described a new order encompassing MATERIAL AND METHODS steppe-like rocky grassland vegetation on serpentine substrates of Bosnia and Herzegovina, Serbia, and Study area. The study area is located in the central Albania – Halacsyetalia sendtneri Ritter-Studnička part of the Balkan Peninsula (southeastern Europe). It 1970. The range of this order coincides with the area of overlaps with the distribution of serpentine outcrops in its nominal species, the serpentine endemic Halacsya Western and Central Serbia and Kosovo. According to sendtneri. Within this order, two new alliances were Horvat et al. (1974), the study area biogeographically described in the same paper, namely Polygonion albanicae belongs to the Eastern Illyrian (Dinaric Alpic) and the Ritter-Studnička 1970 in Central and Potentillion Northern Scardian Mountain subregions of the Central visianii Ritter-Studnička 1970 in Eastern Bosnia and European floristic region. Herzegovina. This vegetation order, although rich in Each location of the studied syntaxa was characterised serpentine endemic and relic species, is classified in by its basic bioclimatic parameters (Table 1), which were Festuco-Brometea Br.-Bl. et Tx. ex Klika et Hadač 1944 extracted from the WorldClim set of global climate due to the presence of elements characteristic of dry layers, and the climatic types were defined according grassland vegetation of the order Festucetalia valesiacae to Stevanović & Stevanović (1995). The extraction Br.-Bl. & Tx. ex Br.-Bl. 1950 (Ritter-Studnička 1970). of bioclimatic parameters was done with DIVA-GIS In the years to follow, many papers describing new 7.5 software Hijmans( et al. 2012). For details about associations from different ultramafic localities in Serbia the distribution of serpentinite outcrops, climatic and Kosovo were published: Jovanović et al. (1992), conditions, and vegetational characteristics of the study Kojić et al. (1992), Marković (2007), Millaku et al. area, see Kuzmanović et al. (2016). (2011), Kabaš et al. (2013). All these new associations were listed in some review articles and books within Data collecting. For the purposes of this study, a the order Halacsyetalia sendtneri (Horvat et al. 1974; data set of 298 relevés of 25 associations distributed Lakušić et al. 1978; Zupančič 1986; Tatić & Veljović throughout the area of serpentinite outcrops in Bosnia 1992; Kojić et al. 1998; Aćić et al. 2014). Nevertheless, and Herzegovina and Serbia including Kosovo was the results of a recent study of Kuzmanović et al. (2016) studied. More detailed information regarding all on the complete vegetation of the order Halacsyetalia analysed syntaxa is given in Table 2. All relevés used sendtneri in the Central Balkans suggested a somewhat in this article are stored in the Grassland Vegetation of differentsyntaxonomical scheme within it and provided Serbia Database (GIVD number: EU-RS-002, Aćić et al. new solutions for the alliances. To be specific, the 2012). existence of two geographically and floristically well- Relevés were made according to the methodology defined alliances was pointed out: (1) Centaureo of Braun-Blanquet (1964). The plot size was usually kosaninii-Bromion fibrosi on the territory of Kosovo the one standard for grasslands (Chytrý & Otýpková and Northern Albania; and (2) Potentillion visianii 2003), but generally relevés varied from 9–100 m2. in Eastern Bosnia and Herzegovina and Western and The nomenclature and taxonomy of plant taxa are Central Serbia. in agreement with the Flora Europaea Database (Tutin Moreover, the authors of several detailed studies of et al. 2001; http://rbgweb2.rbge.org.uk/FE/fe.html), the Balkan serpentine flora and vegetation suggested except for Bothriochloa ischaemum (L.) Keng., Bromus that the vegetation cover of Balkan ultramafics needs fibrosus Hack., Cytisus procumbens Bojer ex Baker var. S. Jovanović et al: Seven associations of the order Halacsyetalia sendtneri in Serbia 223 Table 1. Basic bioclimatic variables for locations of studied syntaxa, extracted from the WorldClim set of global climate layers (BIO1 = annual mean temperature, BIO6 = minimum temperature of coldest month, BIO9 = mean temperature of driest quarter, BIO12 = annual precipitation, BIO18 = precipitation of warmest quarter, BIO19 = precipitation of coldest quarter). Associations Localities
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