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Inner Mongolia Agricultural University (2019)

Study on Community Characteristics and Population Pattern of Several Shrubs and Semi-shrubs in Northern Ningxia

温静;

Titre : Study on Community Characteristics and Population Pattern of Several Shrubs and Semi-shrubs in Northern Ningxia

Auteur : 温静;

Grade : Master’s Theses 2019

Université : Inner Mongolia Agricultural University

Résumé partiel
Shrubs and semi-shrubs are the main components of arid vegetation,and they play a vital role in maintaining the biodiversity,ecological service functions and stability of desert ecosystems.This study relies on the“China Desert Major Plant Community Survey" project,through field field survey,combined with low-altitude aerial photography,using species diversity index and point pattern analysis method,species composition and species diversity of several shrubs and semi-shrub communities in Ningxia region.The study on the distribution pattern of dominant populations aims to formulate the digital distribution map of desert plant communities and provide basic data services to provide scientific basis for the protection,utilization and research of plant resources in desert areas of China.The results are as follows :(1)There are 77 species of plants in the study area,belonging to 18 families and 51 genera.The ferns are 1 family,1 genera and 1 species,accounting for 1.30%of the total species.There are 1 species and 1 genera of gymnosperms,accounting for 1.30%of the total species.There are 75 species of 49 genera in 16 families of angiosperms,accounting for 97.40%of the total species.The composition of the fauna is relatively simple,mostly drought-resistant or salt-tolerant plants,such as:Artemisia ordosica,Nitraria sibirica,Salsola passerina.(2)The total coverage and total density of shrubs in Artemisia ordosica-Salix cheilophila community were the largest,and the habitat was fixed sand,which created an environment suitable for the survival of Artemisia ordosica,Salix cheilophila and other sand plants.The total coverage and total density of shrub species in the Nitraria sihirica community were the smallest,indicating that the shrub species had the least biomass.(3)Among the 9 plots,there were 7 plots distributed in the Artemisia ordosica population,accounting for 77.77%of the surveyed communities,and the important values were in the first two,indicating that the oilseed population was widely distributed in the desert areas of Ningxia.Artemisia ordosica is an excellent sand-fixing semi-shrub peculiar to the semi-arid sand area of China.(4)The species diversity of each community is generally low.In addition to the dominance degree,the pearl shrub-red sand community has the highest diversity index,indicating that the community is relatively stable.

Mots clés : Shrub; Community characteristics; Species diversity; Point pattern analysis; Spatial association;

Présentation (CNKI)

Page publiée le 22 mai 2020