Abstract:

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 indic
es of herb layer significantly. All the test indices of herb layer had significant differences between the sites of planting ginseng and P. brachycarpa.

Key words: Wheat, Enhanced ammonium nutrition(EAN), Growth stage, Growth response, Nitrogen utilization