七姊妹山常绿落叶阔叶混交林物种多样性格局及其环境解释
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引用本文:朱 强,艾训儒,吴漫玲,黄 小,王 进,彭宗林.七姊妹山常绿落叶阔叶混交林物种多样性格局及其环境解释[J].西北植物学报,2019,39(8):1491~1502
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作者单位
朱 强1,艾训儒1*,吴漫玲1,黄 小1,王 进1,彭宗林2 (1 湖北民族大学 林学园艺学院湖北恩施 4450002 湖北七姊妹山国家自然保护区管理局湖北恩施 445000) 
基金项目:国家重点研发项目“典型脆弱生态修复与保护研究”(2016YFC0503100)研究专项;
中文摘要:依托七姊妹山自然保护区6 hm2森林动态监测样地研究平台,基于样地和物种基本信息数据,采用多元回归树和冗余分析研究方法,探讨地形因子对生境的塑造作用及物种分布特征,分析不同群丛类型下物种多样性的变化规律。结果表明:(1)依据“1 SE”规则,4次分割依次以海拔(1 453 m)、坡度(23.13°)、海拔(1 398 m)、凹凸度(4.094)为分界点可将150个样地分为5个群丛。(2)冗余分析表明地形因子对物种分布解释量为0.077 6,解释率为16.36%,各环境因子对物种分布的解释力度依次为:海拔>坡度>凹凸度;坡向与物种的分布无显著相关性。(3)5个群丛中立木密度与胸高截面积最高的均为群丛5(527.4株/400 m2;3.495 cm2/株),立木密度与平均胸高截面积最低为群丛4(225.4株/400 m2;3.057 cm2/株)。(4)5个群丛中Shannon Winener丰富度指数与Simpson优势度指数最高的均为群丛2,最低的为群丛5,物种多样性尺度效应明显;Pielou均匀度指数最高为群丛4,最低为群丛5。(5)两两群丛间Jaccard相似性系数最低为群丛1 群丛2(0.331),最高的为群丛4 群丛5(0.645),海拔对β多样性格局影响较大。研究认为,七姊妹山自然保护区6 hm2样地地形因子对该区域生境的塑造具有一定作用,海拔、坡度、凹凸度组成的“环境筛”影响了该区域的物种分布及多样性格局。
中文关键词:物种多样性  生境异质性  地形因子  环境筛选
 
Species Diversity Pattern and Environmental Explanation of Evergreen Deciduous Broad leaved Mixed Forest in Qizimei Mountains
Abstract:Relying on the 6hm2 dynamic monitoring forest stand of research platform in Qizimei Mountains Nature Reserve, based on the sample area and species basic information data, by the method of multiple regression tree and redundancy analysis, we investigated the effect of terrain factors on habitat and species distribution of response to the environment and under different types of association analysis the change rule of species diversity. Researches show that: (1) according to the “1 SE” rules, four split in turn in altitude (1 453 m), slope (23.13°) and altitude (1 398 m), concave and convex degree (4.094) as the cut off point 150 sample area can be divided into five clusters. (2) The redundancy analysis shows that the interpretation amount of terrain factor to species distribution is 0.077 6, and the interpretation rate is 16.36%. The explanatory power of each environmental factor to species distribution is in order: meanelve > slope > convexity. There was no significant correlation between slope direction and species distribution. (3) Cluster 5 had the highest stand density (527.4 plants/400 m2) and chest height sectional area (3.495 cm2/plant) in the five clusters. Cluster 4 was the lowest standing density (225.4 plants/400 m2) and average chest height sectional area (3.057 cm2/plant). (4) Among the five clusters, the Shannon Winener richness index and Simpson dominance index were highest in cluster 2, and lowest in cluster 5. The scale effect of species diversity was obvious. The highest Pielou evenness index was cluster 4, and the lowest was cluster 5. (5) The Jaccard similarity coefficient between two clusters was lowest in cluster 1 cluster 2 (0.331) and highest in cluster 4 cluster 5 (0.645). It was concluded that the 6 hm2 sample topographic factor in the nature reserve of Qizimei Mountains had a certain effect on the shaping of the habitat in the region, and the “environmental sieve” composed of meanelve, slope and convexity affected the species distribution and diversity pattern in the region.
keywords:species diversity  habitat heterogeneity  terrain factor  environmental screening
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