应用生态学报2012，Vol.23Issue(3)：673-678,6.
基于生态位理论的典型草原铁杆蒿种群化感作用
Allelopathic effects of Artemisia sacrorum population in typical steppe based on niche theory
摘要
Abstract
By using modified Levins niche width index and Pianka niche overlap index, this paper analyzed the ecological competition between constructive and dominant species in a typical steppe. The stem- and leaf extracts from the constructive species (Artemisia sacrorum) were utilized to study their allelopathic potential on the seed germination and plant growth of the dominant species ( Stipa bungeana, Thymus mongolicus, S. grandis, and Leymus secalinus), and the ecological position of A. sacrorum in the steppe succession. In the steppe, S. bungeana had the widest niche width (0. 99) , followed by T. mongolicus (0. 94) , A. sacrorum (0. 82) , S. grandis (0. 76) , and L. secalinus (0. 73). The niche overlap value between A. sacrorum and S. bungeana, S. bungeana and T. mongolicus, T. mongolicus and S. grandis, and A. sacrorum and T. mongolicus was 0.90, 0. 95, 0. 94, and 0. 86, respectively. The allelopathic effects of A. sacrorum extracts varied with their concentration. For the seed germination, root growth, and shoot growth of the dominant species, A. sacrorum extracts showed a trend of promoting at low concentrations and inhibiting at high concentrations. The extracts of A. sacrorum had a stronger promotion effect on the root growth of S. bungeana than on that of T. mongolicus, but a stronger inhibition effect on the shoot growth of T. mongolicus than on that of S. bungeana. Methanol extracts had stronger allelopathic effects than aqueous extracts. The high niche overlap between A. sacrorum and S. bungeana, and T. mongolicus and S. grandis indicated that the steppe community would continue succession to S. bungeana, while A. sacrorum population was only an important transitional stage during the succession. The al-lelopathic effect of A. sacrorum played a driving role in the succession process.关键词
生态位/铁杆蒿/化感作用/植被演替Key words
niche/ Artemisia sacrorum/ allelopathy/ vegetation succession分类
农业科技引用本文复制引用
王辉,谢永生,程积民,摄晓燕..基于生态位理论的典型草原铁杆蒿种群化感作用[J].应用生态学报,2012,23(3):673-678,6.基金项目
中国科学院重要方向性项目(KZCX2-YW-441)、"十二五"国家科技支撑计划项目(2011BAD31B01)和水利部公益性行业科研专项(200901051,201001036)资助. （KZCX2-YW-441）
