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Shihezi University (2018)

Study on the Seed Plants at the Low-mountain Deserts in the Upper and Middle Reaches of the Manas River in Xinjiang

刘佳;

Titre : Study on the Seed Plants at the Low-mountain Deserts in the Upper and Middle Reaches of the Manas River in Xinjiang

Auteur : 刘佳;

Grade : Master’s Theses 2018

Université : Shihezi University

Résumé
The desert in Xinjiang is large in area and diverse in type.Apart from the desertification in the beach,it includes other types of deserts,and the low desert is one of the most common and very special types of desert.The low-mountains deserts on the northern slope of the Tianshan are the “mountain-basin” intersection between the Tianshan Mountains and the Junggar Basin.It is often a winter pastoral area for pastoral animal husbandry.Plant species are relatively diverse and complex.They are key areas for species diversity and weak areas for research.In this paper,the low-mountain desert seed plants in the upper reaches of the Manas River in the middle part of the northern slope of the Tianshan Mountains were studied.Field observations and collection and identification of plant specimens were carried out,and some relevant literature data were used to determine the plant species in the area.Based on the analysis of the seed plant species,composition of family and genus,life type and ecological type,endemic phenomena,rare and endangered plant resources and floristic characteristics in the area,the results showed that:1.There are 44 families,174 genera,and 294 species of desert seed plants in the upper and middle reaches of the Manas River in Xinjiang.There are 1 family and 1 genera and 1 species of gymnosperm,43 families,173 genera and 293 species of angiosperm.The angiosperms are dominant.Among angiosperms,there are 253 species of dicotyledon in 39 families,148 genera,and 40 species of 25 genera in 4 families of dicotyledonous plants,mainly dicotyledonous plants.2.From the perspective of the quantitative level structure of the genus level,there are 37 families,accounting for 84.09%,of the single genus and oligopathies(2-5 genera),which is the main body of the family,but few in number ;many families(16-30)and middle subjects(6-15)have 7 families,accounting for 15.91%,but the genera account for 62.07%,which is the main body of the department.From the species level structure of the family,there are 38 families and 86.37% of single families and oligospecies,which is the main subject of the family,but the number of species is small ;there are 6 families in the larger and medium branches,accounting for 13.63%,but species accounted for 62.93%,which is the main body of the district.3.Composition of genus : The genus(11-20 species)is only Salsola(13 species)and Astragalus(12 species),which are the dominant genus in this area ;the genus of genus Oligo(2-6)There are 269 genera of 172 genera and 8.8 genera,which account for 98.85% and 91.50% of total genera and total species,respectively.It is the main component of this flora.4.The comparison of the six families of this family with the world flora revealed Chenopodiaceae,Cruciferae,Polygonaceae and Boraginaceae as the flora of this family.Compositae(45 species),Polygonaceae(42 species),Cruciferae,Gramineae,Leguminosae,Lithospermum,Liliaceae,Lamiaceae,and Polygonaceae are the dominant families in this area.Department of Characterization ;comparing the regions with more species and Xinjiang flora,found that Compositae,Leguminosae,and Gramineae are dominant in number,but compared with the Xinjiang region,their proportion is not High,only Chenopodiaceae and Cruciferae are not only dominant in quantity,but also occupy a high proportion in the Xinjiang region.Their advantages are obvious.5.The endemism of this region is not obvious

Mots clés : The northern slope of the Tianshan Mountains; low-mountain deserts; seed plants; flora; species diversity;

Présentation (CNKI)

Page publiée le 15 mai 2019