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当前位置: 首页 > 文章 > 基于生态位理论的典型草原铁杆蒿种群化感作用 应用生态学报 2012,23 (3) 673-678
Position: Home > Articles > Allelopathic effects of Artemisia sacrorum population in typical steppe based on niche theory Chinese Journal of Applied Ecology 2012,23 (3) 673-678

基于生态位理论的典型草原铁杆蒿种群化感作用

作  者：
王辉;谢永生;程积民;摄晓燕
单  位：
西北农林科技大学资源环境学院;中国科学院-水利部水土保持研究所
关键词：
生态位;铁杆蒿;化感作用;植被演替
摘  要：
运用改进的Levins生态位宽度指数和Pianka生态位重叠指数,研究了典型草原草地建群种与优势种之间的生态竞争关系;并利用建群种(铁杆蒿)茎叶浸提液对不同优势种的化感种子进行发芽试验,分析铁杆蒿的化感潜力及其在封育草地中的生态地位.结果表明:封育草地中,本氏针茅的生态位最宽(0.99),其次为百里香(0.94)、铁杆蒿(0.82)和大针茅(0.76),赖草最窄(0.73);铁杆蒿与本氏针茅、本氏针茅与百里香、百里香与大针茅、铁杆蒿与百里香之间的生态位重叠值分别为0.90、0.95、0.94和0.86.不同浓度的铁杆蒿浸提液对植物的化感作用强度不同,表现为"低促高抑".铁杆蒿浸提液对本氏针茅幼苗根系生长的化感促进作用要强于百里香,而对百里香幼苗芽生长的抑制作用要强于本氏针茅.甲醇浸提液的化感作用要强于水浸提液.铁杆蒿、本氏针茅、百里香和大针茅之间高的生态位重叠,说明该草地群落将继续向本氏针茅群落演替,铁杆蒿群落仅是一个重要的过渡演替阶段.铁杆蒿的化感作用在其中担负着驱动力的角色.
译  名：
Allelopathic effects of Artemisia sacrorum population in typical steppe based on niche theory
作  者：
WANG Hui1,XIE Yong-sheng1,2,CHENG Ji-min2,3,SHE Xiao-yan1(1College of Resources and Environment,Northwest A & F University,Yangling 712100,Shaanxi,China;2Institute of Soil and Water Conservation,Chinese Academy of Sciences & Ministry of Water Resources,Yangling 712100,Shaanxi,China;3Institute of Soil and Water Conservation,Northwest A & F University,Yangling 712100,Shaanxi China).
关键词：
niche;Artemisia sacrorum;allelopathy;vegetation succession
摘  要：
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 allelopathic effect of A.sacrorum played a driving role in the succession process.

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