Niche Dynamics of Dominant Species during Restoration Process of Meadow Steppe in Enclosure
The aim of this study was to find out dynamic change of niche of Hulunbeier meadow steppe. The niche dynamics of dominant species in enclosure meadow steppe of Hunlunbuir during restoration process were analyzed by means of niche breadth index and niche overlap index.The results showed that the total breadth of niche of Leymus chinensis ,Poa sphondylodes ,Cleistogenes squarrosa were higher than other species.Poa sphondylodes ,Leymus chinensis ,Allium neriniflorum ,Leymus chinensis were the species with the largest niche breadth for the restoration stage of 1,3,5 and 7 years respectively.The niche breadth of Leymus chinensis was higher.The niche breadth of Poa sphondylodes ,Cleistogenes squarrosa was gradually decreased.There was a trend that the niche breadth of Allium neriniflorum ,Ser-ratula centauroides ,Caragana microphylla increased with increasing degree of community restoration. The dominant position of Gramineae decreased.There were linear relationships between niche breadth and niche overlap.The interspecific competition was increased with enclosure,then,the interspecific generated niche differentiation and competition was decreased,the community developed towards stable state.
NETL
NSTL
万方数据
维普
