草业学报Issue(9)：43-52,10.DOI:10.11686/cyxb2014410
黄土区长期封育草地优势物种生态位宽度与生态位重叠对不同干扰的响应特征
Response of dominant population niche breadths and niche overlaps to various dis-turbance factors in typical steppe fenced grassland of China’s Loess Plateau region
摘要
Abstract
The Levins niche breadth and Pianka niche overlap indices were used to assess the response of plant population niches to grazing,burning and fertilization in permanently fenced grassland of the Loess Plateau re-gion.Species with highest niche width in fenced (control group),grazed,burned and fertilized grasslands were Carex rigesaens ,Ixeridium chinense ,Artemisia sacrorum ,and Stipa bungeana ,respectively.The niche breadth of S .bungeana in different disturbance situations (ranked highest to lowest)was:fertilization (1.362)>burning (1.244)>fencing (1.088 )>grazing (1.026 ).The richness index for the same four treatments ranked:grazing>fertilization>burning>fencing.The average values of niche overlap of all the species and dominant species ranked:fertilization>fencing>burning>grazing.The pairs of species with the highest niche overlap in fertilized,fenced,burned,and grazed grasslands were,respectively,S .bungeana and C.rigesaens , Stipa grandis and C.rigesaens ,S .grandis and C.rigesaens ,and I .chinense and Poa sphondylodes ,respec-tively.These findings indicate that human disturbance can increase the species richness and improve plant pop-ulation niche width to facilitate maximum resource use in permanently fenced grassland.关键词
生态位宽度/生态位重叠/干扰类型/典型草原Key words
niche breadth/niche overlap/disturbances type/typical grassland引用本文复制引用
井光花,程积民,苏纪帅,魏琳,史晓晓,金晶炜..黄土区长期封育草地优势物种生态位宽度与生态位重叠对不同干扰的响应特征[J].草业学报,2015,(9):43-52,10.基金项目
国家自然科学基金重点项目“气候变化背景下黄土高原土地利用影响径流的空间尺度效应”（41230852），中国科学院战略性先导科技专项“应对气候变化的碳收支认证及相关问题”（XDA05050202）和农业部“现代农业产业技术体系建设专项”（CARS-35-40）资助。 （）
