金佛山喀斯特山地灌丛巴山榧树群落特征  

Characteristics of the Torreya fargesii Community of the Karst Mountain Shrub in the Jinfo Mountains

作　　者：汪建华[1] 周先容[1] 尚进[1] 江波[1] 张燕[1] 何秀利[1] 

机构地区：[1]长江师范学院生命科学与技术学院,重庆涪陵408100

出　　处：《四川师范大学学报（自然科学版）》2014年第3期389-395,共7页Journal of Sichuan Normal University（Natural Science）

基　　金：教育部"春晖计划"(Z2011144);重庆市自然科学基金(CSTC2012JJA00006);重庆市教委科学技术研究基金(KJ111318)资助项目

摘　　要：以金佛山自然保护区的巴山榧树灌丛群落为研究对象,采用群落学方法对该群落的种类组成、外貌、结构和物种多样性进行分析,以期为巴山榧树的保护提供科学参考.结果表明:1)在沿海拔梯度设置的5个样地20个5 m×5 m样方中,共记录到维管束植物64科136属176种,其中蕨类植物有4科6属7种,裸子植物2科3属3种,被子植物58科127属166种;2)群落的外貌主要由中小型草质、单叶为主的高位芽植物所决定,高位芽植物在区系谱、频度谱和植被谱中所占百分比分别为68.75%、73.13%、67.48%;3)群落垂直结构可划分为灌木层和草本层.灌木层的优势种有巴山榧树、异叶花椒、插田泡、棣棠花、平枝栒子等;草本层的优势种为芒、穹隆苔草、白苞蒿、蕨、冷水花、三脉紫菀等;4)灌木层的物种丰富度(S)、Simpson指数(D)、Shannon-Wiener指数(H')和Pielou均匀度指数(Jsw)均高于草本层;群落中物种分布具有明显的不均匀性,群落物种丰富度指数和多样性指数随海拔升高而增加.The characteristics of the T. fargesii community in the Jinfo Mountains of Chongqing City was studied to provide base- line information related to the protection of T. fargesii. An analysis of the species composition of the T. fargesii community, the physiognomy, structure and species biodiversity produced the following results. 1 ） Among the five plots consisting of twenty 5 m × 5 m quadrats set along an altitudinal gradient, 64 families of vascular plants, 136 genera and 176 species were recorded, which included four families, six genera and seven species of pteridophytes, two families, three genera and three species of gymnosperms and 58 families, 127 genera and 166 species of angiosperms. 2） The community physiognomy was mainly dominated by phanerophytes with medium - sized herbaceous and simple leaves. The proportions of phanerophytes among the floristic spectrum, frequency spectrum and vegetational spectrum were 68.75% ,73.13% and 67.48% respectively. 3） The vertical structure could be divided into the shrub and herb layers in this community. The dominant species in shrub layer mainly were T. fargesii, Zanthoxylum ovalifolium, Rubus coreanus, Kerria japonica, Cotoneaster horizontalis etc.. The dominant herbs included Miscanthus sinensis, Carex gibba, Artemisia lactiflora, Pteridium aquilinum var. latiusculum, Pilea notata, Aster ageratoides etc.. 4） Species richness （S） and the Simpson （ D）, Shannon-Wiener （ H＇ ） and Pielou evenness （Jsw） indices of shrub layer species richness were higher than those of the herb layer; the distribution of the species in the community was obviously uneven. The species richness and diversity indices increase with an increase in altitude.

关 键 词：巴山榧树 群落特征 物种多样性 金佛山 

分 类 号：Q948.15[生物学—植物学] S718.54[农业科学—林学]