Abstract: A 1hm² permanent plot from the ecoreclamation area in Antaibao Opencast Coal Mine of China Coal Pingshuo Coal Company Limited was established after reforestation of a mixed plantation of “locust (Robinia pseudoacacia) + elm (Ulmus pumila) + ailanthus (Ailanthus altissima)”. Based on the 2010 and 2015 survey data, quantitative characters of major regenerated species during vegetation restoration process were analyzed, to provide a scientific basis for revealing natural regeneration of artificial vegetation and sustainable management. The results showed that during 2010-2015, the number of seedling individuals in the plot increased from 4216 to 11177, and that of sapling individuals increased from 687 to 727. The increased numbers of seedlings and saplings were mainly contributed by elm and ailanthus. The survival rate of seedlings was in the order of elm > ailanthus > locust, and that of saplings was in the order of elm > locust > ailanthus. Seedlings in the plot showed an aggregated distribution on the scale of 0-20 m, and the degree of aggregation decreased with the increase of scale. Saplings showed an aggregated distribution on smallscale (0-5 m), and a random distribution on the other scales. Whether at community level or species level, the heights of seedling and sapling and biological factors jointly affected the survival of seedlings and saplings. There was a significant densitydependent effect in the natural regeneration process of ecoreclamation area in Antaibao Opencast Coal Mine.

Key words: plant community height, measuring plate., aboveground biomass, estimate model