放牧对阿尔泰山哈巴河地区草地植物群落稳定性与多样性及其生物量关系的影响OA北大核心

[Objective]The aims of this study are to examine the community characteristics of grassland plants in the Habahe region of Altai Mountains,changes in plant diversity,aboveground biomass in relation to community stability,and to provide data support for the development of a rational grazing system in Habahe region.[Methods]From 2020 to 2022,18 representative fixed sample plots were selected in the summer pasture of Habahe in Altai Mountains to do surveys to investigate the number of species in the sample plots,cover and height,etc.,and to determine the aboveground biomass,β-diversity(Sφrensen β-diversity index and Jaccard β-diversity index),species diversity(Margalef richness index,Simpson dominance index,Shannon-Wiener diversity index and Alatalo evenness index)and M.Godron community stability.The relationship between community stability and plant diversity and its biomass before and after grazing was analyzed.[Results](1)30 species of grassland communities were distributed in the Habahe region of Altai Mountains,belonging to 14 families,with Asteraceae,Rosaceae and Gramineae in the majority.(2)The diversity index,cover,plant height and above-ground biomass of grasslands in the Habahe region showed a significant downward trend after grazing.(3)The stability of grassland communities in the Habahe region before grazing was positively correlated with the Margalef richness index,the Simpson dominance index,and the Shannon-Wiener index diversity index in a highly significant way(p＜0.01);and the stability of grassland communities in the Habahe region after grazing was positively correlated with the Simpson dominance index in a significant way(p＜0.05).(4)The relationship between grassland community stability and aboveground biomass in the Habahe region before grazing showed a significant positive correlation(p＜0.05),and the relationship between grassland community stability and aboveground biomass in the Habahe region after grazing showed no correlation.[Conclusion]The relationship between grassland community stability and diversity and biomass changed significantly after grazing,and grazing had a greater impact on community stability and reduced the stability of the community to a certain extent,but the community was generally in a stable state.