| Jiangxi Province is located in the middle and lower Yangtze River region in southeastern China,and belongs to the central subtropical humid monsoon climate zone,with high vegetation cover and many kinds of plants.However,the weak research base,limited accumulation of data and inadequate field surveys have led to a lack of clarity on the species and number of angiosperm resources in Jiangxi.Up to now,Jiangxi is one of only two provinces in China that have not completed the preparation and publication of local botanical histories,which has seriously restricted the development,utilization,ecological protection and scientific research of the province's botanical resources.Against this background,this thesis builds on more than 10 years of work accumulated by the group in the early stages,and through extensive literature collection,specimen review,fieldwork and database searches,it identifies 5493 species of angiosperms from 184 families and 1242 genera in Jiangxi,which is the most up-to-date and complete information on the overall study of angiosperm resources in Jiangxi Province.On this basis,this thesis presents a comprehensive zonal analysis of the angiosperms of Jiangxi,with the following main findings:(1)Rich in species diversity.There are 184 families,1242 genera and 5493 species of angiosperms in Jiangxi Province,including 150 families,948 genera and 4385 species of dicotyledons and 34 families,294 genera and 1108 species of monocotyledons.At the section level,there are 24 sections containing only 1 species,representing 13.04% of the total number of sections;there are 60 oligomorphic families containing 2 to 10 species,accounting for 32.61% of the total number of families;there are 28 intermediate families containing 11 to 20 species,accounting for 15.22% of the total number of families;there are 41 larger families containing 21 to 50 species,accounting for 22.28% of the total number of families;there are 31 large families containing 51 or more species,accounting for 16.85% of the total number of families;the Poaceae(465 species),Asteraceae(279species)and Rosaceae(277 species)are the three most diverse families in Jiangxi.At the generic level,there are 493 monospecific genera,accounting for 39.69% of the total number of genera;502(40.42%)of the few genera containing two to five species;133small genera containing 6-10 species(10.17%);77 medium sized genera containing 11 to20 species,or 6.2%;37 large genera containing 21 or more species,or 2.98%;The dominant genera in the woody layer are Ficus,Camellia and Acer,the dominant genera in the herbaceous layer are Viola and Polygonum,and the lianas are Rubus.(2)The zone is rich in distribution types and has a diverse phytogeographic composition.The angiosperm flora of Jiangxi province contains a total of 184 families of plants,which can be divided into 13 range types and 15 variants;of these,the pantropical range contains the largest number of plant species,with 60 families,accounting for 44.12%of the non-world range,the main families are the Piperaceae,Vitaceae and Aristolochiaceae.There are 88 families of tropical nature,accounting for 64.71% of the non-worldly families,and 48 families of temperate nature,accounting for 35.29% of the non-worldly families,this suggests that the angiosperm family is strongly tropical in nature and that the flora is clearly zoned.There are 1078 genera of native plants in the angiosperm flora of Jiangxi Province,which can be divided into 14 distribution types and 10 variants.The North Temperate range has the largest number of genera,with 159 genera,accounting for 16.32% of the non-widespread genera.Genera with a tropical character number 491,accounting for49.25% of the total number of genera(worldwide genera are not counted).There are 506 genera of a temperate nature,accounting for 50.75% of all genera(worldwide genera are not counted).The temperate nature of the genus is slightly more dominant,with both tropical and temperate natures evident.In comparison with the range type statistics of the family,the proportion of plants of a tropical nature is significantly lower,further demonstrating that the angiosperm flora of Jiangxi Province is in a transitional zone between the central subtropics and the northern subtropics,and that the development of the flora is transitional.(3)A rich and diverse range of plant resources.The angiosperm flora of Jiangxi Province contains many ornamental plants,medicinal plants,and plants for other uses;of these,109 families,305 genera and 715 species of flowering plants are represented.The Rosaceae(73 species),Ericaceae(65 species)and Orchidaceae(43 species)are the three families with the highest number of species;Rhododendron(52 species),Clematis(18species)and Rosa(15 species)are the three genera containing the largest number of species.Fifty-seven species of fruit-bearing plants,112 genera and 272 species;the Rutaceae(36 species),Aquifoliaceae(18 species)and Rosaceae(17 species)are the three families with the highest number of species;the genera Ilex(18 species),Elaeagnus(15species)and Zanthoxylum(14 species)are the three genera containing the largest number of species;123 families,340 genera and 993 species of foliage plants;of these,the Fagaceae(104 species),Aquifoliaceae(60 species)and Poaceae(59 species)are the three families containing the largest number of species;Ilex(60 species),Rhododendron(43species)and Acer(39 species)are the three genera with the highest number of species included.There are 171 families,917 genera and 2468 species of medicinal plants,of which Asteraceae(182 species),Fabaceae(123 species)and Rosaceae(100 species)are the three families containing the largest number of species;the genera Rubus(29 species),Persicaria(27 species)and Lysimachia(25 species)are the three most numerous genera included.33 families,52 genera and 77 species of poisonous plants;among them,the Ranunculaceae(17 species),the Fabaceae(10 species)and the Schisandraceae(6 species)are the three families containing the largest number of species;Aconitum(11 species),Illicium(6 species)and Ranunculus(4 species)are the three genera containing the greatest number of species.(4)There are many endemic and protected plants.There are 23 families,30 genera and 47 species of endemic plants in Jiangxi.The most numerous families are the Sapindaceae(eight species)and the Rosaceae(seven species);the most numerous genera are Acer(8 species),and Rubus(5 species).There are 187 species of key protected plants,distributed in 35 families and 100 genera.The families with the highest number of species are Orchidaceae(107 species),Actinidiaceae(21 species)and Magnoliaceae(9 species);the most numerous genera are Actinidia(21 species),Liparis(10 species)and Calanthe(nine species).The research content and analysis results of this thesis are the first comprehensive and integrated analysis of the angiosperm resources of Jiangxi,and the species and numbers identified are important references for further updating,refinement and subsequent completion of the Flora of Jiangxi. |
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