Variation in Plant Species Abundance Distribution Patterns during Vegetation Succession on Plateau Zokor Mounds
To investigate the mechanisms of subalpine meadow community construction disturbed by plateau zokor(Eospalax baileyi),a study was conducted on the vegetation of plateau zokor mounds in the subalpine meadow of Tianzhu County,located in the eastern Qilian Mountains.The study spanned various time periods,including one-year,two-year,three-year,multi-year zokor mounds,and a flat control.The analysis focused on changes in species abundance including all species,common species,and rare species.Species abundance data were fitted using the logarithmic series model,geometric series model,broken stick model,and random assignment model.1)The results showed a temporal pattern of species richness that increased and then decreased during vegetation succession,encompassing all species,common spe-cies,and rare species.Specifically,species richness on three-year zokor mounds was 82.4%,16.3%,12.0%,and 47.6%higher than that on one-year,two-year,and multi-year zokor mounds,respectively.The decline in species richness(81.8%)on multi-year zokor mounds compared to three-year zokor mounds was primarily due to the loss of a substantial number of rare species.2)The similarity coefficient between three-year and multi-year zokor mounds reached its highest value of 0.622,indicating moderate heterogeneity.3)Model fitting revealed that the species abundance distributions of all species and common species conformed to the niche model,while rare species followed both niche and the neutral models.The findings suggested that the third year was a crucial juncture in the evolutionary trajectory of plateau zokor mound community structure under grazing control measures in subalpine meadows of Tianzhu County.Dur-ing this period,the assembly of common species exhibited deterministic processes,while the decline of rare species was influenced by both deterministic and stochastic processes.
Species abundanceDistribution patternPlateau zokorMoundBiodiversitySubalpine meadow
NETL
NSTL
万方数据
