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作 者 ：秦浩;董刚;张峰;*

期 刊 ：植物研究 2013年 33卷 5期 页码：605-609

关键词：森林群落；优势种群；分布格局；国家级自然保护区庞泉沟；

Keywords:forest community, dominant population, distribution pattern, Pangquangou National Nature Reserve,

摘 要 ：在野外调查的基础上，运用扩散系数等5种指数、聚集强度、Poisson分布和负二项分布的χ²拟合检验等方法对山西庞泉沟自然保护区森林群落优势种群的分布格局进行了研究，并用相关分析比较了6个指数间的关系。结果表明：(1)乔木层中华北落叶松、白桦、青杄、辽东栎及山杨具有较强的竞争能力和较宽的生态位而呈聚集分布，且聚集强度大；白杄和油松也呈聚集分布，但聚集程度小；红桦则表现出随机分布的趋势。(2)林下层中金银忍冬、东方草莓、披针叶苔草和中亚苔草表现出较强的聚集强度，而土庄绣线菊、美蔷薇、小红菊和糙苏等聚集强度较小；灰栒子、东北茶藨子、北方拉拉藤、山马兰等由于相对较弱的竞争能力和较窄的生态位而呈随机分布。(3)扩散系数(DI)、聚集指数(CI)、平均拥挤度(m^*)、聚块性指数(PAL)、Green指数(GI)之间存在着显著的正相关性，且在判定物种分布格局时应以方差/均值比率为主要依据，Poisson分布和负二项分布的χ²拟合检验为辅共同判定，这样能够更准确的反映出物种的格局分布。

Abstract:Based on the dataset from the field survey, the distribution patterns of dominant populations of vegetation in Pangquangou National Nature Reserve, Shanxi, were studied by a quantitative research, including 5 indexes (Dispersal index (DI), Clump index (CI), Mean crowding (m^*), Patchiness index (PAL) and Green index (GI)), Clump intensity (k), χ²-test for goodness-of-fit for Poisson and negative binomial distributions, respectively. In addition, the relationships among the six indexes were analyzed by correlation coefficient test. The results indicated that: (1) seven species in the arborous storey, Larix principis-rupprechtii, Betula platyphylla, Picea wilsonii, Quercus wutaishanica and Populus davidiana, were of great competitiveness and highly intensive distribution due to the wider ecological niche; while Picea meyeri and Pinustabulaef ormis were aggregated distribution with smaller clumping intensity; Betula albo-sinensis showed a trend of the random distribution. (2) The patterns of four species in the understory, including Lonicera maackii, Fragaria orientalis, Carex lanceolata and Carex stenophylloides, were of great aggregated intensity, and other species, such as Spiraea pubescens, Rosa bella, Dendranthema chanetii, Phlomis umbrosa ect., were aggregated of a slight degree; However, some species, such as Cotoneaster multiflorus, Ribes mandshuricum, Galium boreale, Kalimeris lautureana ect., were randomly distributed due to a relatively weak competitiveness and narrower ecological niche. (3) There was a significant positive correlation among Dispersal index (DI), Clump index (CI), Mean crowding (m^*), Patchiness index (PAL) and Green index (GI). In order to reflect the pattern of certain species, the combined application of variance/mean ratio as well as the χ² test for fitting Poisson and negative binomial distribution was more accurate.

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