| The plants of the genus Impatiens L.in the Balsaminaceae have very high ornamental value.Their flower colors are rich and diverse,and the flower patterns are peculiar and delicate.They have great potential to be developed as ornamental plants.Guizhou is located in the southwest of China and has abundant wild Impatiens resources.It is one of the hot spots for the distribution of Impatiens in China.The southern part of Guizhou has a very strong karst landform,which is a representative of the typical development of karst in Guizhou.It provides a variety of habitat conditions for the genus Impatiens,and breeds a variety of Impatiens resources such as regional endemic species and Chinese endemic species.In this study,the wild Impatiens in the southern region of Guizhou were taken as the research object,and the species and distribution of Impatiens in the study area were clarified through literature review,data sorting and field investigation,so as to supplement the relevant data on taxonomy research of Impatiens in Guizhou Province.On this basis,combining with the environmental factors of Impatiens distribution and their community were analyzed,and further explore and reveal the Impatiens plant community diversity and its relationship with habitat and to provide direction for the wild resource investigation,finally for the area of the rational development and utilization of wild impatiens provide theoretical reference basis.In this study,36 species and 1 variety of Impatiens impatiens in the southern region were finally sorted out,among which 20 species and 1 variety were found by field investigation.Besides,Impatiens dolichoceras E.Pritz.,I.fargesii Hook.f.,I.malipoensis S.H.Huang and I.undulata Y.L.Chen & Y.Q.Lu are new-recorded species in Guizhou province.In addition,the species that have been investigated were identified,updated and supplemented with descriptions,and treated as follows:1)I.apalophylla Hook.f.recorded in Anlong County,Ceheng County,Libo County and Sandu County was updated and identified as I.tianlinensis S.X.Yu & L.J.Zhang;2)I.clavigera var.auriculata S.H.Huang recorded in Libo County was updated and identified as I.tianlinensis S.X.Yu & L.J.Zhang,and the former was deleted from the regional species list;3)I.dichroa Hook.f.recorded in Anlong County was updated and identified as I.dolichoceras E.Pritz.and has been removed from the regional species list;4)I.crassiloba Hook.f.was identified as a synonym of I.ganpiuana Hook.f.,and the latter was merged as a synonym of I.ganpiuana Hook.f.and deleted from the regional species list.Meanwhile,the distribution location of I.ganpiuana Hook.f.was updated;5)Update and identify I.notolopha Maxim.recorded in Duyun city as I.undulata Y.L.Chen & Y.Q.Lu and delete it from the regional species list;6)I.mengtszeana Hook.f.recorded in Xingyi City was updated and identified as I.monticola Hook.f.and has been deleted from the regional species list.In addition,the study found that the environmental conditions in the distribution area of the Impatiens plant community are special,complex and diverse,and multiple environmental factors also affect each other,which leads to the differentiation of its distribution pattern and species level.The environmental variables of the genus plant community and its species are dominated by altitude and heat,and the related factors dominated by altitude can be divided into two categories: wind speed and soil factors;among the related variables dominated by heat,it mainly includes two types of environmental factors: light and temperature.The results of the comprehensive community distribution pattern and species response analysis to environmental factors show that both have very necessary requirements for water conditions.Both the distribution and the species included in the community had a greater impact. |
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