Advances in research on the species-abundance relationship models in multi-species collection Species abundance distribution patterns of Pinus tabulaeformis forest in Huoshan Mountain of Shanxi Province, China Measurement of the Species Diversity of Forest Communities in the North Fujian An Approach to Analyzing Nature of Community Structure: With Examples of Alpine Meadow and Alpine Bushland A Quantitative Study of the Vegetation Succession on the Abandoned Arable Lands of the Subalpine Meadows in Gannan Prefecture of Gansu Province I. Analysis of Community Composition