| The authigenic plants do not need too much maintenance,can reproduce and grow on their own,and have the characteristics of low maintenance cost,ecological benefit value and regional characteristics.This paper takes Huaxi Park in Guiyang City as the research object,and studies the species diversity characteristics and ornamental value evaluation of the authigenic plants in different habitats in different time and space,which has important research value.By using the grid sampling method and OMAP and Auto CAD software,the whole study area is covered with 100 m × 100 m grid,and the grid junction is selected as the sampling point.Finally,54 sampling points are determined according to the actual situation,and each sampling point is set with an area of 1002 m for investigation.According to the location of each plot in the park,the habitat types were divided into waterside(sb),roadside(LB),semi planted forest(LD),grassland(CD),natural mountain(st),and between Garden Road and water body(ylystzj).The results are as follows:(1)A total of 236 species of authigenic plants were recorded,belonging to 188 genera of 82 families,including 56 species of trees,45 species of shrubs,92 species of herbs,29 species of vines and 14 species of ferns.There are 21 species in 17 genera in Asteraceae,13 species in 12 genera in Gramineae,and more than 2 species in 10 species in 46 families,including Oleaceae,Leguminosae,Ranunculaceae,Rosaceae,Urticaceae,Cruciferae,grapevine,Rutaceae,Lauraceae and Moraceae,while the other 34 families are all monotypic families.(2)Among the 236 species of autotrophic plants investigated,the number of alien species is 26,accounting for 11% of the total;the number of native plant species is 210,accounting for 89% of the total.Among the alien plants,there are 3 species of arbors,accounting for 17%;8 species of shrubs,accounting for 30%;11 species of herbs,accounting for 43%;3species of vines,accounting for 12%;1 species of ferns,accounting for4%.Among the local plants,there are 53 species of arbors,accounting for25%;37 species of shrubs,accounting for 18%;81 species of herbs,accounting for 39%;27 species of vines,accounting for 12%;13 species of ferns,accounting for 6%.Herbaceous species accounted for the largest proportion,while ferns accounted for the least.(3)through the calculation and analysis of the important values of autogenous plants,we concluded that Ligustrum lucidum and Pu Shu occupy an important position in all the samples,and are the main dominant species.Besides,legume pod,pears,Rosaceae,Guizhou Photinia,Wutong of Mallow family,and Rhus chinensis are also important in all the samples.In addition,Chimonanthus praecox,saffron and Acanthus trifoliatus were more important in all the plots.In the herbaceous layer,the dominant species was exon,in addition,Stellaria japonica,Lysimachia japonica and Oxalis japonica.(4)The results showed that the distribution rule of the maximum species richness index of each habitat was as follows: natural mountain SD(5.389)> roadside lb(5.344)> ylystzj(3.917)> semi planted forest LD(3.877)> waterside sb(2.485)> grassland CD(0).The highest ecological dominance index of each layer was Herb Layer > shrub layer >tree layer > vine layer.In all the sites,the species diversity index of autotrophs showed the trend of shrub layer > Arbor Layer > herb layer >vine layer.(5)Shannon Wiener diversity index is between 0.854-5.3543.The response of authigenic plant species diversity to climate change in temporal and spatial change is controlled by the dynamic balance of temperature and precipitation.The simplified dominance index of plants is positively correlated with the increase of precipitation and temperature.In the temporal and spatial variation of authigenic plant species diversity index,the mean difference of herb layer diversity is the largest,and the variation of shrub layer and tree layer is relatively stable.58 prominent dominant community groups are selected through community clustering,including 31 dominant community groups in spring,51 in summer,29 in autumn and 25 in winter.With the change of seasonal climate,the ornamental nature of the authigenic plant community in Huaxi Park presents a certain dynamic landscape,It has strong seasonal attributes and regional characteristics.(6)The comprehensive evaluation model of authigenic plants in Huaxi park is constructed.The comprehensive scores are mainly between2.0-2.9886(59),followed by 3-4.4(46),and 11 with scores less than 2.Finally,combined with the species diversity characteristics and ornamental value of authigenic plants,11 kinds of authigenic plants are recommended,such as mother tree of narrow leaf mosquito,Guizhou Heather,small virus wood,wild fan flower,rough chaff wood,Pistacia chinensis,winged locust,park tree,etc. |
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