[Objective]To clarify the changes in plant community structure and diversity during the degradation process of grassland in the southern section of the Greater Xing´an Mountains.[Method]We employed a sampling method to investigate and analyze the vegetation community structure and species composition of grasslands with varyingdegrees of degradation.Important values and diversity indices were calculated to study the changes in species diversity.[Result]A total of 22 families,52 genera,and 61 species of plants were identified in the study area,with the majority belonging to the Poaceae,Compositae,Cyperaceae,Rosaceae,and Leguminosae families.As degradation intensified,biomass,height,coverage,Shannon-Wiener index,and Simpson index of plant species and communities significantly decrease.Notablythe important value of Stellera chamaejasme increased,leading to the formation ofa S.chamaejasme-dominantdegraded grassland.[Conclusion]The degradation of grassland in the southern section of the Greater Xing´an Mountains results in a simplified community structure,reduced diversity and a marked decline in-grasslandquality o,ultimately disruptingthe original stability of the grassland ecosystem.
关键词
大兴安岭南段/草甸草原/退化程度/群落结构/物种多样性
Key words
southern foot of the Great Xing´an Mountains/meadow grassland/degree of degradation/community structure/species diversity
维普
万方数据