| Nanning Arboretum is the biggest garden of plant samples in Guangxi, Many plants have been introduced since it was bulid. The author uses a comprehensive Tacha and typical vegetation sampling combined approach to investigate Arboretum tree resources, statistical resources, species richness; explore the park four major functional areas of plant Resources;from the Ornamental botanical, analysis the Arboretum species ornamental characteristics, development, application status, The aids is to offer scientific basis for protection, development, administration of the plants resources, and offer some technical support for the better development of urban landscape. The results of the study are as follows:(1) According to the characteristics of the various functional areas Arboretum, investigation and analysis which Fengjiang wizard, Puti garden, Amusement world, Management&Living&Residential area of the trees species resources, the construction of plant community, landscape conditions.(2) The results of survey, there are624species (include subspecies, varieties, forms) in Nanning Arboretum, belongs to101families347genera. Among them, gymnosperms has8families14genera25species, angiosperms has93families333genera599species(include dicotyledonous plants89families309genera566species, monocotyledon plants4families24genera33species).(3) Statistics and analysis the changes of plants species of Arboretum in1988and2012year, the result show that, there has123families508genera1271species, the number of plants species has reduced687(which belongs to 106families330genera), and these parts accounted for54.05%of the total trees species before. There are about40new species(which belongs to29families35genera), and accounted for6.41%of existing total plant species., and mostly exotic greening plant species.(4) Analysis Nanning Arboretum trees distribution area types of family and genera, the result show that the geographical distribution of the Arboretum family type is mainly concentrated in the pan-tropical(39families);genera type is mainly concentrated in pan-tropical type(73genera) and tropical Asia type(63genera). The families and genera are decorated in tropical distribution type, showing the nature of tropical and subtropical, and regional climate characteristics affordable.(5) There are9dominant families (species number≥20) in Nanning Arboretum, they are Euphorbiaceae, Myrtaceae, Theaceae, Moraceae, Palmae, Caesalpiniaceae, Fagaceae, Lauraceae, Magnoliaceae; Dominant genera has18(species number≥5), they are Ficus, Camellia, Syzygium, Michelia, Castanopsis, Eucalyptus, Elaeocarpus, Styrax, Citrus, Albizia, Ormosia, Terminalia, Bambusa, Bambusa, Dalbergia, Cassia, Hibiscus, Manglietia.(6) In the Nanning Arboretum, there are9genera belong to Distribution pattern with Chinese characteristics,3species belong to Guangxi endemic;28species belongs to the national important protected plants(including7kinds of Class I level protected plants and21kinds of Class II proected plants);18species belongs to Guangxi region level important protected plants; there are33species of national important protected wild plants resources in investigation(focus on24species and general investigating9);59species have been included in the China red List species (24species endemic to China red trees);37species have been included in the IUCN Red List.(7) Statistics and analysis the trees species composition in Arboretum, the results showed that conifers:broad-leaved≈1:27;trees:Shrubs:vine-12:7:1; evergreen trees:deciduous trees=3:1; basis with the<List of plants in guangxi> as the seed source, native species:Invasive species:cultivated species: naturalized species≈67:17:20:1.(8) Nanning Arboretum tree species according ornamental characteristics can be divided into the ornamental shape-sight tree(147species), the ornamental flower tree(164species), the ornamental fruit tree(113species, the ornamental flower&fruit tree(59species), the ornamental foliage tree(185species), the ornamental branches tree(25species), the ornamental root tree (14species)7classes; according landscaping application the trees can be divided into shade trees(157species), street trees(133species), specimen trees(421species), flowering shrubs(123species), climbing plants(32species), hedge trees and shrubs(94species), ground-cover shrubs(56species), soil and water conservation trees(130species), wetland trees(61species), anti-pollution trees(92species), national trees(139species)11classes.(9) Using the Analytic Hierarchy Process (AHP) for secondary screening of the trees resources, build a hierarchical structure (3layers) and the weight value of standard layer (9), comprehensive weight values to comprehensive evaluation of ornamental trees of161kinds of high-value and Compare the order of their priority development and utilization.(10) This paper analyzes the main tree resources protection and utilization problems of Nanning Arboretum, as well as preliminary targeted recommendations. |
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