不同封育年限对河西走廊中部荒漠植被群落生态位的研究

选取河西走廊中部封育3、5、8、12、13、14年和未封育的荒漠植被,采用样带结合样方法进行野外植被调查,运用重要值、Levins生态位宽度指数和Pianka生态位重叠指数进行研究,分析了荒漠植被对资源的利用情况,揭示不同封育年限荒漠植被群落中种群生态位格局。结果表明,随着封育年限的延长和群落的演替,物种丰富度指数先增高后降低;物种均匀度指数和多样性指数呈先增高后降低再增高的变化趋势;物种重要值呈先降低再增高又降低的变化趋势。生态位宽度大的主要集中在盐生草、驼蹄瓣、刺沙蓬、苔草、沙蒿、画眉草、锋芒草、羊茅、红砂、青蒿等,说明这些植物适应环境能力强,能够充分利用环境资源,而且在群落中处于优势地位。

Study on the Niche of Desert Vegetation Community in Central Hexi Corridor With Different Years of Closure and Breeding

Selection of desert vegetation in the middle of the Hexi Corridor for closure of 3、5、8、12、13、14 a and uncultivated,field vegetation survey using a combination of sample band and sample method,study using important values,Levins niche width index and Pianka niche overlap index,The utilization of resources in desert vegetation was analyzed,and the niche patterns of the population in desert vegetation community were revealed.The results showed that the species richness index increased and then decreased with the extension of the years of closure and the succession of the community.The species evenness index and diversity index increased first and decreased the change trend of increase.The change trend of species importance decreases first and then increases and decreases.The large niche width is mainly concentrated in Halogeton glomeratus,Zygophyllum fabago,Salsola ruthenica,Carex tristachya,Artemisia desertorum,Eragrostis pilosa.Tragus racemosus,Festuca ovina,Reaumuria songarica,Artemisia carvifolia.etc.indicating that these plants are adaptable to the environment and can make full use of environmental resources.And it is in a dominant position in the community.