Investigating the population structure and spatial pattern of restored forests in an opencast coal mine, China

文献类型： 外文期刊

第一作者： Zhao, Bingqing

作者： Zhao, Bingqing;Bai, Zhongke;Guo, Donggang;Shao, Hongbo;Bai, Zhongke

作者机构：

关键词： Size-class structure;Static life table;Survival curve;Spatial pattern;Opencast coal mine

期刊名称：ENVIRONMENTAL EARTH SCIENCES （ 影响因子：2.784； 五年影响因子：2.867 ）

ISSN： 1866-6280

年卷期： 2017 年 76 卷 20 期

页码：

收录情况： SCI

摘要： To understand the underlying ecological process of vegetation restoration, a 0.8-hm(2) locust tree ( Robinia pseudoacacia) and pine (Pinus tabuliformis) mixed-forest plot was established after a 17-year restoration (from 1993 to 2010) in the south dump of the Antaibao opencast coal mine in Shanxi Province, China. In this study, changes in the species composition, size-class structure and spatial pattern were examined to investigate the population structure and spatial pattern of restored forests. The static life tables were compiled and the survival curves analyzed to reveal the quantitative dynamics of the populations. After the 17-year restoration, other than the initially planted R. pseudacacia and P. tabuliformis, another three invasive species, Ulmus pumila, Populus simonii and Spiraea trilobata, had colonized the studied plot. There were 2501 surviving individuals, among which R. pseudoacacia and P. tabuliformis comprised 63.7% of all individuals, while the invasive species U. pumila comprised 35.5% of all individuals. The current total species density increased from 0.22 plants m(-2) at the initial plantation to 0.31 plants m(-2). The number of regenerated R. pseudoacacia individuals was less than that of U. pumila. P. tabuliformis regenerated poorly. The size-class distribution of all individuals with a diameter at breast height (DBH) >= 1 cm showed an inverted "J'' distribution, which indicated that the community was in a stable status. Based on their size-class frequencies, the size-class distributions were classified into three types: an inverted "J'' distribution, represented by R. pseudoacacia; a nearly normal distribution, represented by P. tabuliformis; and an L-shaped distribution, represented by U. pumila. The survival curves of R. pseudoacacia and P. tabuliformis showed the Deevey-I type, while the U. pumila population showed the Deevey-III type. R. pseudoacacia seedlings were relatively sufficient, but there was a shortage of saplings. Despite a temporary lack of young individuals, P. tabuliformi can self-regenerate when a large number of P. tabuliformi begins to fruit. U. pumila, with a substantial number of small size-class individuals, may gradually disappear from the plot based on their high mortality rate. The surviving individuals from the initially planted R. pseudoacacia and P. tabuliformi showed a uniform or clustered distribution at a smaller scale and a random distribution as the scale increased. U. pumila showed a clustered distribution at a small scale. R. pseudoacacia dominated the community. Long-term ecological monitoring is needed in the future.

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