Study On Community Characteristics And Population Pattern Of Several Shrubs And Semi-shrubs In Urat Houqi

Shrubs and semi-shrubs,as the main components of vegetation in arid regions,play an important role in maintaining desert species diversity,ecosystem service functions and ecosystem stability.The study of the spatial pattern of plant populations is an important method to analyze the energy flow and information transmission between plant populations and the environment.At present,there are few studies on the spatial pattern of shrub population in Urat.This study uses a combination of low-altitude aerial photography and ground survey to take shrubs and semi-shrub plants in Urat Houq as the research object,to deeply analyze the species composition,structural characteristics,species diversity and population spatial pattern of shrub and semi-shrub communities.To rationally use and restore vegetation resources,protect and rationally use endangered plants,and provide basic data for desert plant digital distribution maps,desert plant community services,and provide scientific basis for the protection and utilization of plant resources in desert regions of China.The results are as follows:(1)There are 63 plant species in the survey area,belonging to 45 genera and 13 families.Vegetation in the survey area is angiosperm,the most plant species is Gramineae(Gramineae)plants,11 genera and 16 species,accounting for 25.39%of the total number of species.The composition of the flora is relatively simple,most of which are drought-resistant,strong-xerophytic or salt-tolerant plants,such asReaumuria soongarica,itraria tangutorum,and Salsola passerina.(2)The shrub population of Urat Houqi is mainly distributed in aggregate type,and some populations are randomly distributed on a small scale,and most shrub and semi-shrub populations are distributed in aggregate type,indicating that Urat Houqi is lack of environmental resources and plants When spreading seeds,the mother plant is used as the diffusion center.(3)Among the 63 plots in the survey area,there are 36 shrub communities,10 semi-shrub communities,15common superior semi-shrub and shrub communities,and 2 herbaceous communities.It shows that shrubs and semi-shrub communities are widely distributed in the desert grassland of Urat Houqi,and shrubs and semishrubs are the main constructive species of the plant community in the desert grassland of Urat Houqi.(4)The diversity index and species evenness index of the shrub community in Wulathouqi are low,the ecological dominance is high,and the species distribution in the community is extremely severely differentiated;the species diversity levels of different Nitraria tangutorum communities and Artemisia sphaerocephala community are generally low.The similarity coefficient of each community is between(0.038-0.667),except for individual communities,the level of similarity between communities is generally low.(5)The populations of Nitraria tangutorum and Convolvulus gortschakovii are in a large scale,and both are significantly positively correlated.The two coexist in harmony;the populations of Nitraria tangutorum and Artemisia ordosica are in a large scale,and the two dominant species The negative correlation shows that the two have formed fierce competition for environmental resources.