景泰石质山坡沙冬青天然种群分布特征

Population Distribution Characteristics of Natural Ammopiptanthus mongolicus on Stony Hillside in Jintai

对石质山坡天然沙冬青的群落特征、种群密度、株高、冠幅、分枝数、新稍生长量等指标进行了对比研究,结果表明:在不同立地条件下,天然沙冬青的种群特征、年龄结构及分布格局有着明显差异;石质山坡沙冬青种群长势顶部优于其他部位,阳坡面优于阴坡面;天然沙冬青种群在阳坡和阴坡顶部呈现均匀分布,而在阴坡中部和底部呈现集群分布;阳坡面和阴坡面沙冬青种群主要为幼树,属稳定性种群,尚未出现严重衰退的迹象。

Comparative study was conducted on the indexes of community characteristics, population density, plant height, crown diameter, branch number and new shoot increment of natural A mmopiptanthtts mongolicus on stony hillside. The results showed： there were obvious differences in population characteristics, age structure and distribution pattern of A mmopiptanthus mongolicus under different site conditions, A mmopiptanthus mongolicus population grew better on the top than on the other locations, and they grew better on southern slope than on northern slope; they showed uniform distribution on the top of southern and northern slopes, however, they were aggregated on the middle and bottom of northern slope; A mmopiptanthus mongolicus population on the southern and northern slopes were dominated by sapling and belonging to stable population, there had not appeared sign of serious decline.