This article presents the results of studying the species composition of the dendroflora of the Kukhistan district.The features of the taxonomic composition are considered. As a result of the conducted research, the speciescomposition of the dendroflora of the botanical-geographical Kukhistan district was formed for the first time,according to which it was established that it consists of 4292 herbarium specimens of 116 species belonging to 26families and 46 genera. The 5 polymorphic families with the largest number of genera and species account for66.37% of the total dendroflora. The results show that this dendroflora is characteristic of the Mountain-CentralAsian province

Gulchehra Dadaeva

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The Bioscan

 81 ABSTRACT   This article presents the results of studying the species composition of the dendroflora of the Kukhistan district. The features of the taxonomic composition are considered. As a result of the conducted research, the species composition of the dendroflora of the botanical-geographical Kukhistan district was formed for the first time, according to which it was established that it consists of 4292 herbarium specimens of 116 species belonging to 26 families and 46 genera. The 5 polymorphic families with the largest number of genera and species account for 66.37% of the total dendroflora. The results show that this dendroflora is characteristic of the Mountain-Central Asian province.  KEYWORDS Vegetation cover,  anthropogenic load,  biodiversity,  shrubs and trees,  geographical distribution,  conservation. Received on: 25-07-2024 Accepted on: 09-11-2024           19(2): S.I (1), 81-85, 2024                                                                                         www.thebioscan.com                                                                                 TAXONOMIC COMPOSITION OF THE DENDROFLORA OF THE KUHISTAN BOTANICAL-GEOGRAPHICAL DISTRICT   Gulchehra Dadaeva  PhD student, Institute of Botany of the Academy of Science of the Republic of Uzbekistan,  E-mail: dadayeva_gulchehra@mail.ru Tashkent, Uzbekistan. DOI:  https://doi.org/10.63001/tbs.2024.v19.i02.S.I(1).pp81-85      Kuhistan district, part of the mountainous Central Asian Province, is distinguished by its high floristic diversity [1, 2]. According to R.V.Kamelin (1979), the Kuhistan district includes the Turkestan and Zarafshan ranges and the eastern part of the Molguzar range. The authors of "Botanical Geography of Central Asia and Kazakhstan" [3] mention Turkestan, the northern slopes of the Zarafshan and Hisar ranges, and the greater part of the Aloy range as the Kuhistan sub-province of the Mountainous Central Asian province. The botanical-geographical zoning map of Uzbekistan [1] mainly reflects the views of R.V.Kamelin and shows that the botanical-geographical district of Kuhistan includes North Turkestan, Urgut, Molguzar, and Ziadin-Zirabulok botanical-geographical regions. The part of Uzbekistan in the Kuhistan district is mainly represented by the Turkestan and Molguzar ridges. Protected atural areas include Zomin State Reserve and Zomin National Nature Park [4]. Preliminary information on the flora of the district belongs to M.G.Popov and N.V.Androsov (1937). Later, an increase in knowledge in this regard was associated with the research of Ye.M.Demurina (1975). M.B.Tirkasheva (2011), A.S.Esankulov (2012), F.O.Khasanov et al. (2013), L.A.Botirova (2013), and others can be included among the studies conducted in recent years. They contain information on the composition of flora and plant cover in some parts of the Turkestan range. The latest information on the flora of the Molguzar range is reflected in the work of D.E.Azimova (2018). Information on the flora of the part of Kuhistan district outside Uzbekistan is given in A.A.Konnov (1966), G.Gaffarov (1991), N.A.Sulaymanov (2008), and other works.  The long-term research carried out so far provides general information on the composition of the flora of the district. However, the creation of digital maps in the geoinformation system and the formation of a database that reflect the complete species composition of the flora or some of its elements, including species composition, distribution, and status of rare species, require new research. Research objects and methods. Research was conducted on the basis of routed and semi-stationary methods of floristry [5, 6]. In order to determine the main characteristics of the dendroflora, the sequence of the leading families and genera in terms of the number of species was determined [5]. The main source for the composition of species is the field research conducted during 2019–2023. Also, specimens collected from the research area and stored in the herbarium of the National Herbarium of Uzbekistan (TASH), Moscow State University (MW), and the Botanical Institute named after V.L.Komarov (LE) were involved. In addition, data posted on the Plantarum INTRODUCTION N Save Nature to Survive  82 (https://www.plantarium.ru/) online platform were also accepted for analysis. In the synopsis of Dendroflora, plant families are listed according to APG IV (2016). Genera and species (as well as their authors) were adopted mainly on the basis of the identifiers of plants of Central Asia (1969–1993) and, in most cases, were coordinated according to POWO (POWO, 2023). The systems proposed by S.Raunkiaer (1937) and I.G.Serebryakov (1964) were used to determine the life forms of plant species and were revised according to the identifiers of plants in Central Asia (1969–1993) and the flora of Uzbekistan (1941–1963).  Obtained results and their discussion. As a result of the study of the materials collected during the field research conducted in 2019–2023 and the samples collected from the research area and stored in large herbarium funds, it was found that 116 species of trees and shrubs belonging to 26 families and 46 genera are found in the part of the botanical-geographical district of Kuhistan belonging to the Republic of Uzbekistan (Table 1). In terms of the composition of the dendroflora, it is possible to see the disproportion between large taxonomic units. Gymnosperms (Gymnospermae) consist of 8 species (6.9%), belonging to 2 families (Ephedraceae, Cupressaceae) and 2 genera (Ephedra, Juniperus). Angiosperms (Angiospermae) form the basis of the flora, and 24 families with 106 species belonging to 44 genera participate in this area (93.1%). Table 1 Taxonomic composition of the dendroflora of the botanical-geographic district of Kuhistan № Taxons Number of genera Number of species Species % GYMNOSPERMAE Subclass PINIDAE Ordo Pinales Gorozh. 1 Cupressaceae  Gray. 1 3 2.59 Subclass GNEТIDAE Ordo Ephedrales Dumort 2 Ephedraceae Dumort. 1 5 4.31  Total of Gymnosperm plants 2 8 6.9% ANGIOSPERMAE Clade EУDICOТS Ordo Ranunculales Juz. eх Bercht. 3 Berberidaceae Juss. 1 3 2.59 4 Ranunculaceae Juss. 1 1 0.86 Ordo Proteales Juss. eх Bercht. & J.Presl 5 Platanaceae Т. Lesтib. 1 1 0.86 Ordo Saхifragales Bercht. & J.Presl 6 Grossulariaceae DC. 1 1 0.86 Ordo Fabales Bromhead 7 Fabaceae Lindl. 5 12 10.34 Ordo Rosales Bercht. & J.Presl 8 Rosaceae Juss. 13 41 35.34 9 Elaeagnaceae Juss. 2 2 1.72 10 Rhamnaceae Juss. 1 2 1.72 11 Ulmaceae Mirb. 2 4 3.44 12 Moraceae Gaudich. 1 2 1.72 Ordo Fagales Engl. 13 Juglandaceae DC. eх Perleb 1 1 0.86 14 Betulaceae Gray 1 2 1.72 Ordo Malpighiales Juz. eх Bercht. & J.Presl 15 Salicaceae Mirb. 2 10 8.62 Ordo Sapindales Juss. eх Bercht. & J.Presl 16 Anacaridaceae R. Br. 1 1 0.86 17 Sapindaceae Juss. 1 3 2.59 18 Simaroubaceae DC. 1 1 0.86 Ordo Malvales Juss. eх Bercht. & J.Presl 1 Тhymelaeaceae Juss. 1 1 0.86  83 9 Ordo Santalales Р.Br. eх Beрcht. & J.Presl 20 Santalaceae R. Br. 1 1 0.86 Ordo Caryophyllales Juz. eх Bercht. & J.Presl 21 Тamaricaceae Link. 2 2 1.72 22 Polygonaceae Juss. 1 3 2.59 23 Amaranthaceae Juss. 1 3 2.59 Ordo Solanales Juss. eх Bercht. & J.Presl 24 Solanaceae Juss. 1 1 0.86 Ordo Lamiales Bromhead 25 Oleaceae Hoffmanns. & Link 1 1 0.86 Ordo Dirsacales Aуss. eх Bercht. & J.Presl 26 Caprifoliaceae Juss. 1 9 7.76  Total of Angiosperm plants 44 108 93.1%  Total: 46 116 100%  One of the indicators showing the main aspects of the flora is the composition of polymorphic families, which take the lead in terms of the number of species [7]. Based on this, an analysis of polymorphic families and genera in dendroflora was carried out during the research conducted in the Kuhistan district (Table 2).  Table 2 The spectrum of polymorphic families and genera of dendroflora of the botanical-geographic district of Kuhistan. № Families NoG NoS % Genera NoS % 1 Rosaceae 13 41 35.34 Prunus 10 8.60 Rosa 9 7.76 Cotoneaster 7 6.03 2 Fabaceae 5 12 10.34 Astragalus 7 6.03 3 Salicaceae 2 10 8.62 Salix 6 5.17 4 Caprifoliaceae 1 9 7.76 Lonicera 9 7.76 5 Ephedraceae 1 5 4.31 Ephedra 5 4.31   22 77 66.37  53 45.66  Other families (21) 24 39 33.63 Other genera (39 ) 63 54.34  Total: 46 116 100%  116 100% Explanation: NoG – number of genera; NoS – number of species.  The 5 families listed in the table participated with 77 species belonging to 22 genera and making up 66.37% of the total dendroflora. Usually, in the analysis of the composition of the leading families, special attention is paid to the first three families [8]. Asteraceae, Poaceae, and Fabaceae (As-Poa-Fa) lead the sequence of leading families in the flora throughout the Holarctic, including the mountainous regions of Central Asia [8]. The top three families of dendroflora in the study area include Rosaceae (41 species), Fabaceae (12), and Salicaceae (10). They include 20 genera (43.48%) and 63 species (54.30%), making up 66.37% of the total dendroflora. The leading position of the Rosaceae family is distinguished not only by the high number of species but also by the fact that it is almost three times more than the species of the family in the next place, as well as by the highest diversity in the number of genera (Table 2). The  84 leadership of the Rosaceae family in the flora of Kuhistan district is due to Prunus (10 species), Rosa (9), Cotoneaster (7), and Crataegus (3). The Fabaceae family (5 species, or 10.87%) occupies the second place in the dendroflora of the botanical-geographic district of Kuhistan. The leadership characteristics of the family are also characteristic of other dendrofloras of the ancient Mediterranean [9, 10]. The dominance of this family in the dendroflora was explained by the abundance of Astragalus species (7/6.03%) (Table 3).    Table 3 Species of the Fabaceae family of the Kuhistan district and herbarium specimens belonging to them  Genera TASH fund  (1926–2019) Field research  (2019–2023) Total number of species NoS NoH NoS NoH Astragalus 6 86 7 130 7 Caragana 1 3 2 25 2 Colutea 1 20 1 63 1 Halimodendron 1 7 1 35 1 Onobrychis 1 20 1 55 1 Total: 10 136 12 308 12 Explanation: NoS – number of species; NoH – number of herbariums.  The remaining genera of the Fabaceae family, Caragana (2/1.72%), Colutea (1/0.86%), Halimodendron (1/0.86%), and Onobrychis (1/0.86%), are relatively rare in the area as a result of environmental factors. Salicaceae completes the top three leading families. There are more than 200 species of this family on Earth [11]. In the study area, the family participates with the genera Salix and Populus. The leadership position of the Salix genus is explained by the wide ecological range of some species and the abundance of favorable environments for their growth in the study area. A similar situation can be noted for the Populus genus. In the Uzbekistan part of the Kuhistan district, this family is represented by a total of 10 species, most of which are recorded in the flora of the Turkestan and Molguzar mountain ranges. During the research, Populus nigra L. and Salix excelsa S.G. Gmel. are listed for the first time for the territory of Uzbekistan in the Kuhistan district.  The family Caprifoliaceae, which occupies the next place in the spectrum of leading families, includes nine species belonging to the genus Lonicera. Among them, Lonicera altmannii, L. microphylla, and L. nummulariifolia are the dominant plant communities in the upper hills and mountains of the study area. Lonicera bracteolaris Boiss. & Buhse is introduced for the first time in the study area. In the case of the Ephedraceae family, we can see a situation where one genus is the leader in terms of the number of species. Five species (E. equisetina, E. fedtschenkoae, E. foliata, E. intermedia, E. regeliana) belonging to the Ephedra genus were identified in the study area. Among them, E. equisetina is the dominant species in the plant communities of hill and mountain regions. In addition to the polymorphic families leading in terms of the number of species, it is necessary to pay special attention to the Cupressaceae family, which forms the basis of the vegetation cover of the middle and upper mountain regions. The genus Juniperus from this family includes three species, and all of them form formations [12]. As a result of the comparative analysis of the genera and species of large families in the dendroflora of other regions of the study area, it was found that 58 (49.99%) species in the Molguzar ridge, 56 (48.27%) species in the Zomin reserve, and 35 (30.17%) species in the TASH coll. make up the total dendroflora. The dendroflora among the trees and shrubs in the flora of the Molguzar ridge from these areas differs from the dendroflora of TASH coll. and Zomin State Reserve by the large number of species in the Rosaceae (31), Fabaceae (12), and Salicaceae (7) families (Table 4). Table 4 Distribution of the composition of the leading polymorphic families in some parts of the research area   Families TASH coll. (1915-2019) Zomin reserve (Esankulov, 2012) Molguzar ridge (Azimova, 2017) Genus % Species % Genus % Species % Genus % Species % Rosaceae 6 (13.04%) 13 (11.20%) 13 (28.26%) 30  (25.86%) 10 (21.73%) 31 (28.26%) Fabaceae 5 (10.86%) 10  (8.62%) 4 (8.69%) 12 (10.34%) 4  (8.69%) 12 (10.34%) Salicaceae 2 (4.34%) 3 (2.59%) 2 (4.34%) 6 (5.17%) 2 (4.34%) 7 (6.03%) Caprifoliaceae 1 (2.17%) 5 (4.31%) 1 (2.17%) 4 (3.45%) 1 (2.17%) 3 (2.59%) Ephedraceae 1 (2.17%) 4 (3.45%) 1 (2.17%) 4 (3.45%) 1 (2.17%) 5 (4.31%)  85              Total: 15  (32.58%)  35  (30.17%)  21  (45.63%)  56  (48.27%)  18  (39,10%)  58  (49.99%)  In summary, 77 species (66.37%) of the total dendroflora are included in the leading polymorphic families in the dendroflora of the Kuhistan district. The remaining 21 families have 39 species (33.63%). On average, one family has 15.6 species. The results of the research conducted were transferred to a digital format and included in the database on the species diversity of the flora of Uzbekistan. Also, the results of the taxonomic analysis of dendroflora, including specimens stored in herbarium funds, and field records, are geolinked and placed on a grid system map. New research aimed at conducting an inventory of the composition of dendroflora shows that determining the taxonomic composition of natural flora, forming a modern taxonomic list, and creating living collections of plants are of significant scientific and practical value.    • Камелин Р.В. Кухистанский округ горной Средней Азии. – Л.: Наука, 1979. – 117 с. • Тожибаев К.Ш., Бешко Н.Ю., Попов В.А. Ботанико-географическое районирование Узбекистана // Ботанический журнал, 2016. – № 10. – С. 1105-1132. • Рачковская Е.И., Волкова Е.А., Храмцов В.Н. Ботаническая география Средней Азии и Казахстана. – Л.: Наука, 2003. -425 с. • Toshboev Z.M., Umrzokov I., Umrzokova G. 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TAXONOMIC COMPOSITION OF THE DENDROFLORA OF THE KUHISTAN BOTANICAL-GEOGRAPHICAL DISTRICT

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TAXONOMIC COMPOSITION OF THE DENDROFLORA OF THE KUHISTAN BOTANICAL-GEOGRAPHICAL DISTRICT

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