中文摘要：

以样方调查数据为基础,采用物种丰富度指数、均匀度指数和多样性指数,对辽宁省东部山区森林生态系统中种植林下参和大叶芹这两种作物对林下植物物种多样性的影响进行了研究,并分析了不同作物种植样地和未种植样地以及不同种植作物样地之间的各种指数的差异程度。结果表明：（1）种植两种作物均对灌木层物种产生了显著的影响,降低了物种多样性。（2）种植林下参使得草本层的物种丰富度显著降低,均匀度显著增加,而多样性指数差异不显著。（3）种植大叶芹使得草本层的物种丰富度、均匀度和多样性指数均显著降低。（4）林下参种植样地和大叶芹种植样地之间草本层的物种丰富度指数、均匀度指数和多样性指数之间存在显著差异。

英文摘要：

Based on the datasets from sampling plots,and by using species richness index,evenness index,and diversity index,this paper studied the effects of planting ginseng and Pimpinella brachycarpa on the understory plant species diversity in the mountain area of eastern Liaoning Province,and analyzed the differences in the test indices among different planting practice sites. The planting of ginseng and P. brachycarpa decreased the species diversity of shrub layer significantly. Planting ginseng decreased the species richness and increased the evenness of herb layer significantly,but had no significant effects on the species diversity of herb layer. Planting P. brachycarpa decreased the test indices of herb layer significantly. All the test indices of herb layer had significant differences between the sites of planting ginseng and P. brachycarpa.