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Scientia Silvae Sinicae ›› 2017, Vol. 53 ›› Issue (12): 12-19.doi: 10.11707/j.1001-7488.20171202

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Spatial Pattern and Association among Sub-Layers of Typical Mid-Subtropical Natural Broad-Leaved Forest Community

Ma Zhibo1, Huang Qinglin1, Zhuang Chongyang1, Zheng Qunrui2, Wang Hong1   

  1. 1. Key Laboratory of Forestry Remote Sensing and Information Technology of State Forestry Administration Research Institute of Forest Resource Information Techniques, Chinese Academy of Forestry Beijing 100091;
    2. Administrative Office of Wanmulin Provincial Nature Reserve, Fujian Province Jian'ou 353105
  • Received:2017-03-27 Revised:2017-11-14 Online:2017-12-25 Published:2018-01-13

Abstract: [Objective] The objective of this study was to determine the construction mechanism of typical mid-subtropical natural broad-leaved forest community by studying spatial pattern and association based on natural stratification of arbor-layer.[Method] Five plots in size of 50 m×50 m set up at a location where the forest is nearly old-growth forest community in Wanmulin Nature Reserve in Fujian Province were investigated. The arbor layers of the plots were divided into sub-layers using the maximum light receiving plane (MLRP) method. The spatial pattern of each sub-layer and association of paired sub-layers therefore could be tested based on the spatial point pattern analysis.[Result] The arbor layer of each plot could be divided into light receiving layer (sub-layer Ⅰ) and none-light receiving layer (sub-layer Ⅱ). Arbor trees in each sub-layer of each plot are mainly in random pattern in the small spatial scale of 0-25 m. Only at a few scales trees of sub-layers deviated from the null model of complete spatial random, among them, trees of sub-layer Ⅰ tended to have a uniform dispersion because of strong competition and almost equivalent competitive power, but trees of sub-layer Ⅱ displayed a cluster pattern because of aggregation growth of some species in that sub-layer. Sub-layers Ⅰ and Ⅱ displayed overall non-significant association, most paired sub-layers displayed the null model at almost all scales indicating an equilibrium between total positive effects and total negative effects derived from various ecological processes.[Conclusion] The studied typical mid-subtropical natural broad-leaved forest communities are structured by neutral factors. The communities are stable and can be maintained for a long time because various ecological processes in the communities are at equilibrium.

Key words: mid-subtropical zone, natural broad-leaved forest, Wanmulin, spatial pattern, association, stratification of arbor layer, neutral theory

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