不同生长基质的苔藓植物优势种生态位与种间联结  

Niche and interspecific association of dominant bryophytes on different substrates

作　　者：刘艳[1] 郑越月 敖艳艳 LIU Yan;ZHENG Yueyue;AO Yanyan(College of Life Sciences,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]重庆师范大学生命科学学院,重庆401331

出　　处：《生态学报》2019年第1期286-293,共8页Acta Ecologica Sinica

基　　金：重庆高校创新团队(CXTDX201601018);重庆市自然科学基金项目(cstc2016jcyjA0031)

摘　　要：对重庆大巴山国家级自然保护区内800—2400 m海拔区间,岩石和土壤两种基质的苔藓植物群落进行样方调查。以不同植被类型作为资源状态,分别计算群落优势种的生态位宽度和生态位重叠值。采用方差比率法、卡方检验(χ2)和种间联结系数(AC)分析种间联结性。结果表明,石生和土生苔藓植物优势种在落叶阔叶林中的重要值均最高。15种石生苔藓植物优势种的生态位宽度为0.574—1.783,其中大羽藓的生态位宽度最大; 10种土生苔藓植物优势种的生态位宽度为0—1.361,其中厚角绢藓的生态位宽度最大。石生和土生苔藓优势种间的生态位重叠值分别为0.048—0.939和0—0.998。两种基质优势苔藓种间总体联结性的方差比率VR均小于1,且W值均不在置信区间内,表明种间总体上呈现显著负联结,群落处于演替的前期或中期。石生和土生苔藓优势种分别有37对和20对种对的联结性达到显著水平。同一物种在不同基质上的生态位宽度存在差异。同一种对在不同基质上的生态位重叠值和种间联结系数也存在差异。Bryophyte communities at altitudes of 800 m to 2400 m on both rocks and soil were investigated in Dabashan National Nature Reserve,Chongqing. Niche breadth and niche overlap of dominant bryophytes on the two substrates were calculated and analyzed,using vegetation type as the resource. Variance ratios( VR),χ^2tests,and association coefficients( AC) were used to analyze interspecific associations. The results showed that the highest importance values of dominant bryophytes on both rocks and soil occurred in deciduous broad-leaved forest. Niche breadth values of the 15 most-dominant bryophytes on rocks ranged from 0.574 to 1.783. Among these species,Thuidium cymbifolium had the highest niche breadth value. On the other hand,niche breadth values of the 10 most-dominant bryophytes on soil ranged from 0 to 1.361;that of Entodon concinnus was the highest. Niche overlap between dominant species on rocks and soil varied from 0.048 to 0.939 and from 0 to 0. 998,respectively. The VR values were both less than 1 and the W values were outside the confidence intervals,which indicated that there were significantly negative correlations between dominant species on rocks and on soil and that the bryophyte communities were in the primary stage of succession. Interspecific associations of 37 bryophyte species pairs on rocks and 20 species pairs on soil reached significant levels. Niche breadths of the same species,and niche overlap and AC of the same species pairs on the two different substrates were different.

关 键 词：苔藓植物 生态位宽度 生态位重叠 种间关联 大巴山国家自然保护区 

分 类 号：Q948[生物学—植物学]