| 摘要: |
| 【目的】对北京鹫峰地区侧柏人工林草本层群落物种多样性及种间关系进行研究，以更好地认识该地区侧柏林草本层物种组成、结构、功能及与环境的关系。【方法】基于50个侧柏样方的调查数据，运用Simpson指数、Shannon Weiner指数、Pielou指数和Gini指数4个多样性指数进行物种多样性计算，利用方差比率（VR）法，并结合以χ2检验为基础的联结系数AC和共同出现百分率PC等方法，对主要物种种间的联结性进行测度。【结果】侧柏人工林草本层物种均匀度指数较大，Pielou、Gini指数分别为0.809和0.807，而物种多样性指数偏小，Simpson、Shannon Weiner指数分别为0.591和1.137； VR为1.826，草本层主要种群间整体上表现出净的正关联；在草本层的28个种对中，有10个种对达到显著联结（3.841≤χ2<6.635），其中有3个种对达到极显著关联（χ2≥6.635），且在显著关联种对中，显著正关联的有70%，表明该草本层群落中主要物种处于稳定阶段；狗尾巴草(Setaria viridis)与牵牛花(Pharbitis nil)表现出极显著正联结，而(Oplismenus undulatifolius)、披针叶苔草(Carex lanceolata)表现出极显著负联结； AC值和PC值的计算结果与χ2统计量结果基本一致，为了能够更加准确地分析种对的关联程度，在以χ2检验为基础的同时，结合联结系数AC和共同出现百分率PC等方法测度物种种间的联结性更有说服力。【结论】北京鹫峰地区侧柏人工林草本层主要物种的关联性在整体上表现出净的正关联，说明该群落在向着顶极群落发展，群落结构及种类趋于完善和稳定，种间关系也趋于正关联，以实现物种间的稳定共存。 |
| 关键词: 侧柏人工林 草本层物种多样性 种间关系 北京鹫峰 |
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| 基金项目:“十二五”农村领域国家科技支撑计划项目（2012BAD22B0502）；中央高校基本科研业务费专项资金（BLJD200907,JD2010-2） |
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| Plant diversity and interspecific relationship of main herb species in Platycladus orientalis plantation in Jiufeng Mountain, Beijing |
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ZHANG Peng,WANG Xinjie,LING Wei,et al
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| Abstract: |
| 【Objective】The plant diversity and interspecific relationship of main herb species in Platycladus orientalis plantation in Jiufeng Mountain were analyzed to better understand the community composition,structure,function and environment relationship of herb layer in P.orientalis plantation forest. 【Method】Based on the data at 50 quadrats in P.orientalis plantation,Simpson index,Shannon-Weiner index,Pielou index and Gini index were used to investigate the species diversity of herb layer in P.orientalis plantation in Jiufeng Mountain.The correlation among the species was analyzed using variance ratio (VR),as well as 2 test based coefficient (AC) and percentage of co occurrence (PC).【Result】In herb layer of P.orientalis plantation in Jiufeng Mountain,Beijing,the species evenness index was large,the Pielou index was 0.809,the Gini index was 0.807,the species diversity index was small,the Simpson index was 0.591,and the Shannon-Weiner index was 1.137.The VR was 1.826,and main species in the herbaceous layer showed positive correlation.Among the 28 specie pairs in herbaceous layer,there were 10 pairs with significant relationship (3.841≤χ2<6.635),and 3 pairs with extremely significant correlation（χ2≥6.635).Among significantly correlated pairs,70% showed positive correlation,indicating that the dominant species in herbaceous layer were stable.Significant positive correlation was found between S.viridis and Pharbitis nil,and significant negative correlation was found between S.viridis and Oplismenus undulatifolius,S.viridisand Carex lanceolata.The AC and PC results were consistent with χ2 statistic results.Combing χ2 test,AC and PC would be more convening in measuring relationship. 【Conclusion】The interspecific relationships of main herb species in P.orientalis plantation of Jiufeng Mountain were positive,indicating that the community is moving toward a climax community development,community structure and species tend to be perfect and stable,and interspecific relationship tends to be positive for stable species coexistence. |
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