利用双向指示种分析方法(Two-way indicator species analysis,TWINSPAN)和6个物种多样性指数,研究了旅游干扰下五台山不同植被景观区物种多样性的特征.结果表明:1)TWINSPAN将所有样地划分为9类植被景观区,从Ⅰ区到Ⅸ区,随着旅游干扰程...利用双向指示种分析方法(Two-way indicator species analysis,TWINSPAN)和6个物种多样性指数,研究了旅游干扰下五台山不同植被景观区物种多样性的特征.结果表明:1)TWINSPAN将所有样地划分为9类植被景观区,从Ⅰ区到Ⅸ区,随着旅游干扰程度的增加,植被景观大致由乔灌草区向灌草区、草本区和居民区方向变化.2)乔木层物种的丰富度和综合多样性随着旅游干扰的减小而趋于增加,但是其均匀度没有表现出明显的规律性.3)灌木层物种的丰富度和综合多样性也随着旅游干扰的减小而趋于增加,至于其均匀度,则呈现出在中度干扰下值最大,干扰很小的地方次之,在重度干扰下则最小.4)草本层物种的丰富度、均匀度和综合多样性指数均在旅游干扰适度的地方达到了最大值,在旅游干扰很小的地方,各种值则次之,在干扰严重的地方为最小.5)从整个植被层物种多样性的角度看,随着旅游干扰程度的减少,物种丰富度指数、均匀度指数和综合多样性指数均呈现趋于增加的趋势.展开更多
在数字化长潭自然保护区地图的基础上,均匀设置66个标准样地进行群落调查,根据调查数据进行双向指示种分析(Two-way indicator species analysis,TWINSPAN).结果表明:保护区内主要包括常绿阔叶林、杉木林、针阔混交林、以及杉木-马尾松...在数字化长潭自然保护区地图的基础上,均匀设置66个标准样地进行群落调查,根据调查数据进行双向指示种分析(Two-way indicator species analysis,TWINSPAN).结果表明:保护区内主要包括常绿阔叶林、杉木林、针阔混交林、以及杉木-马尾松共优针叶林4种群落类型;每种类型按树种组分别计算其蓄积量、生物量和碳储量,并与面积加权后得出该群落的碳密度(单位面积碳储量);4种群落碳密度依次为33.94、34.70、51.00和42.05t.hm-2;长潭自然保护区碳储量总计为2.265×105 t,平均碳密度为44.77 t.hm-2,远大于广东省乔木林平均碳密度(25.47 t.hm-2).相关分析表明,碳密度主要受树高、胸径和群落演替时间的影响,与海拔、坡度等地形因子和林木密度没有明显的相关关系(P>0.05).展开更多
Juri is a biodiversity-rich primary forest in Bangladesh, which remains ecologically unexplored. We identified tree species and examined the richness, alpha（a）diversity and floristic similarity patterns within the i...Juri is a biodiversity-rich primary forest in Bangladesh, which remains ecologically unexplored. We identified tree species and examined the richness, alpha（a）diversity and floristic similarity patterns within the identified communities. Vegetation and environmental data were sampled in 120（0.04 ha） study plots. Tree communities were delimited by two-way indicator species analysis（TWINSPAN）. In total, 78 tree species of 35 families and58 genera were identified. TWINSPAN identified six tree communities： A—Tricalysia singularis; B—Kydia calycina-Castanopsis tribuloides; C—Polyalthia simiarum-Duabanga grandiflora; D—Ficus roxburghii; E—Artocarpus lacucha; F—Artocarpus lacucha. Mean richness, Shannon and Gini-Simpson indices were highest for the Polyalthia simiarum-Duabanga grandiflora community, while Ficus roxburghii showed lowest diversity. Significant differences（p = 0.05） in three diversity indices were recorded between Polyalthia simiarum-Duabanga grandiflora and Ficus roxburghii. Tree compositional similarity was greatest between Kydia calycina-Castanopsis tribuloides and Polyalthia simiarum-Duabanga grandiflora（0.712）.展开更多
文摘利用双向指示种分析方法(Two-way indicator species analysis,TWINSPAN)和6个物种多样性指数,研究了旅游干扰下五台山不同植被景观区物种多样性的特征.结果表明:1)TWINSPAN将所有样地划分为9类植被景观区,从Ⅰ区到Ⅸ区,随着旅游干扰程度的增加,植被景观大致由乔灌草区向灌草区、草本区和居民区方向变化.2)乔木层物种的丰富度和综合多样性随着旅游干扰的减小而趋于增加,但是其均匀度没有表现出明显的规律性.3)灌木层物种的丰富度和综合多样性也随着旅游干扰的减小而趋于增加,至于其均匀度,则呈现出在中度干扰下值最大,干扰很小的地方次之,在重度干扰下则最小.4)草本层物种的丰富度、均匀度和综合多样性指数均在旅游干扰适度的地方达到了最大值,在旅游干扰很小的地方,各种值则次之,在干扰严重的地方为最小.5)从整个植被层物种多样性的角度看,随着旅游干扰程度的减少,物种丰富度指数、均匀度指数和综合多样性指数均呈现趋于增加的趋势.
基金funded by the University Grant Commission (UGC), Bangladesh
文摘Juri is a biodiversity-rich primary forest in Bangladesh, which remains ecologically unexplored. We identified tree species and examined the richness, alpha（a）diversity and floristic similarity patterns within the identified communities. Vegetation and environmental data were sampled in 120（0.04 ha） study plots. Tree communities were delimited by two-way indicator species analysis（TWINSPAN）. In total, 78 tree species of 35 families and58 genera were identified. TWINSPAN identified six tree communities： A—Tricalysia singularis; B—Kydia calycina-Castanopsis tribuloides; C—Polyalthia simiarum-Duabanga grandiflora; D—Ficus roxburghii; E—Artocarpus lacucha; F—Artocarpus lacucha. Mean richness, Shannon and Gini-Simpson indices were highest for the Polyalthia simiarum-Duabanga grandiflora community, while Ficus roxburghii showed lowest diversity. Significant differences（p = 0.05） in three diversity indices were recorded between Polyalthia simiarum-Duabanga grandiflora and Ficus roxburghii. Tree compositional similarity was greatest between Kydia calycina-Castanopsis tribuloides and Polyalthia simiarum-Duabanga grandiflora（0.712）.
