Adaptation Character Istics Of Leaf Traits Ofcaragana Species To Different Climaticenvironments In Inner Mongolia Plateau

Caragana is an important shrub on the Inner Mongolia Plateau,which is widely distributed in different ecological climatic zones from east to west.It is of great significance to the restoration of vegetation and the improvement of ecological environment in severely degraded arid areas.To explore the Inner Mongolia plateau plants of the genus Caragana leaf traits to adapt to the characteristics of different climate environment,this article selects 14 kinds of Inner Mongolia plateau,41species of plants of the genus Caragana using scanning electron microscopy(sem)observation,plant leaf epidermal micromorphology characteristics under different habitat,the study of the characteristics of analysis of leaf?¹³C values and water use efficiency and leaf N,P,N:P stoichiometry,The adaptation characteristics of leaf traits in different habitats were analyzed by combining climate factors.The results are as follows:1.The superficial fur of Caragana plants is single cell non-glandular hair;The cell shapes were polygonal,irregular and nearly round.Stomatal position is flat or depressed;Stomatal apparatus type is indeterminate;Vertical wall style includes flat,arch,arc,wave four kinds.The epidermal features of each species were different,and the epidermal features of each group distributed in different habitats in the same species were differentiated.2.The epidermal micromorphological characteristics of 14 Caragana species distributed on the Plateau were significantly different,but did not show a certain change pattern with the increase of drought degree from east to west.3.The characteristic values of leaf epidermis micromorphology of Caragana plants are large or small,sparse or dense,which provide structural basis for their adaptation to living environment in different ways,reflecting the diversity of adaptation strategies.4.The variation coefficient of leaf epidermal micromorphological characteristics of different species was different,and the variation coefficient of widely distributed species was large,indicating that the leaf epidermal micromorphological characteristics of different species had strong adaptive adjustment ability.The coefficient of variation of epidermis and fur was greater than that of stomata,indicating that different tissues were sensitive to different environmental changes.5.Leaf epidermal micromorphological characteristics were significantly correlated with annual sunshine duration,annual effective accumulated temperature,annual average relative humidity,annual average temperature and annual average precipitation,which were influenced by climate factors.6.The?¹³C values and water use efficiency of Caragana species increased with the increase of drought degree.The?¹³C values of Caragana species distributed in arid environment in desert area were larger,and they adapted to the arid environment with high water use efficiency.7.In general,N and P contents in leaves of species distributed in arid environment of desert area were lower.Leaf N,P and N:P were significantly correlated with each other.P is the limiting element of growth;Leaf N and P contents were positively correlated with precipitation and relative humidity,but negatively correlated with annual average temperature.The leaf epidermal micromorphological characteristics,leaf?¹³C values,leaf water use efficiency and leaf N and P stoichiometry characteristics of Caragana species in Inner Mongolia Plateau were different in different habitats.These differences are the variation characteristics of plant adaptation to the habitat,and provide the structural basis and survival convenience for the plant adaptation to the living environment.