Assessment of diversity and distribution patterns of Pteridophytes in the South-Central Biological Corridor III of Bhutan

Karma Wangdra, Bhagat Suberi, C. Fraser-Jenkins
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Abstract

Pteridophytes constitute an important component of forest ecosystems in addition to non-vascular cryptogams and spermatophytes (Magnoliophyta). Study has been carried out to assess the diversity and distribution patterns of pteridophytes in Biological Corridor III of South Central Bhutan with an aim to evaluate species composition along elevation-gradients and to understand how environmental factors influence species richness and distribution. Line-transect methods were adopted on site in four different locations. Species richness and diversity study was conducted in 47 sample plots taken at sizes of (10 x 10m) at 500m interval from 800 to 2200m altitude in three forest types. A total of 64 fern species were recorded represented by 3146 individual plants. Maximum species richness was observed at elevations between 1000 and 2000m. The species diversity index was (H = 1.368), evenness (EH = 0.88) and species richness (SR = 5.1). Pteris normalis was found to have the highest relative abundance of (RA = 9.91); Selaginella monospora had the highest relative density with (Rd = 11.35) and the maximum Importance Value Index of (IVI = 26.48) distributed along the widest range of elevation. Environmental and ecological variables such as temperature, slope and soil pH tend to have negative correlation with species counts. Elevation, soil-moisture content, precipitation and canopy coverage tend to have a positive correlation. Species counts through different vegetation zones tend to increase from tropical to subtropical and gradually decrease towards warm temperate forest.
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不丹中南部生物走廊III中蕨类植物多样性及分布格局评价
蕨类植物是森林生态系统的重要组成部分,与无维管的隐生植物和精生植物(厚朴植物)并列。在不丹中南部第三生物走廊开展了蕨类植物多样性和分布格局的研究,目的是评估沿海拔梯度的物种组成,并了解环境因素如何影响物种丰富度和分布。在四个不同的地点采用样线法。对3种森林类型的47个样地进行了物种丰富度和多样性研究,样地在海拔800 ~ 2200m范围内,间隔500m,面积为(10 × 10m)。共记录蕨类64种,单株3146株。物种丰富度在海拔1000 ~ 2000m之间最大。物种多样性指数为(H = 1.368),均匀度指数为(EH = 0.88),丰富度指数为(SR = 5.1)。正常翼草的相对丰度最高(RA = 9.91);单孢卷柏的相对密度最高(Rd = 11.35),重要值指数最高(IVI = 26.48),分布在最宽的海拔范围。温度、坡度、土壤pH等环境生态变量与物种数量呈负相关。海拔、土壤含水量、降水量和冠层盖度呈正相关关系。不同植被带的物种数量由热带向亚热带逐渐增加,向暖温带森林逐渐减少。
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