Abstract: Regional land development and utilization can influence plant species diversity, and analyzing the mechanisms and patterns of such influence is of great importance. In this study, six land-use types, including woodland, inland beach, orchard, cemetery, farmland furrows and highway land in Jinzhong Basin were chosen to investigate the species composition of plant community. The plant diversity indices (such as the Jaccard similarity index and Gleason richness index) of these six land-use types were calculated. The result showed that the highest Jaccard similarity index (0.552) was found between farmland furrows and cemetery land, while the lowest one (0.216) was found between orchard and highway land. The arithmetic averages of Gleason richness index were ranked as cemetery > furrow > inland beach > woodland > orchard > highway land. The ttest of independent samples revealed the significant differences in Gleason richness index between most pairs of land-use types except for woodland vs. river, woodland vs. orchard, woodland vs. cemetery, river vs. orchards, and cemetery vs. furrow. Moreover, it was found that human disturbance was the principal factor responsible for the difference of plant species diversity among all land-use types. The results provide referential data to improve the rationality and effectiveness in land use and protection of biological diversity in future.

Key words: generalized Pareto model, limited density-size line, maximum density-size line, Larix olgensis plantation, linear quantile regression