辽东山区3种林型林下草本层生物量及生态位特征

以辽东山区红松林、杂木次生林、针阔混交林为研究对象，调查其林下草本层的生物量及物种多样性，结果表明：杂木次生林的林下草本层生物量最大，为0．241kg／m^2，针阔混交林次之，红松林最小；针阔混交林的物种多样性最大，多样性指数为2．806，杂木次生林的物种多样性最小；假升麻的重要值最大，委陵菜的生态位宽度最大，委陵菜与益母草及假升麻与蕨菜的生态位重叠值最大．

Biomass and Niche Characteristics of Understory Herb Layers in Three Types in the Eastern Mountain Area of Liaoning Province

The biomass and diversity of understory herb layers were investigated in three forest stands in the Eastern Mountain Area of Liaoning Province. The results showed that the biomass of mixed broad-leaved secondary forest was the biggest,it was 0. 241 kg/m^2, coniferous broad-leaved mixed forest was the second,Pinus koraiensis forest was the smallest;The diversity of coniferous broad-leaved mixed forest was the biggest, and the diversity index was 2. 806. The diversity of mixed broad-leaved secondary forest was the smallest. The important value of False cimicifuga was the biggest, the niche breadth of Potentilla was the biggest, the niche overlap value of Potentilla and Motherwort, Fern and False cimicifuga were the biggest.