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| Point pattern analysis of spatial distribution of natural secondary forest populations in mountainous area of Beijing: A case study of Wuling Mountain nature reserve |
| Yue Yongjie<sup>1</sup>,Yu Xinxiao<sup>1</sup>,Wu Jun<sup>2</sup>,Zhu Jiangang<sup>1</sup>,Li Wei<sup>1</sup> |
| 1.College of Soil and Water Conservation,Beijing Forestry University,Key Laboratory of Soil & Water Conservation and Desertification Combating of Ministry of Education,100083;2. The Office of Sandy Desertification combating,Beijing Municipal Bureau of Landscape and Forestry,100029: Beijing,China |
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Abstract Based on the inventory of a natural secondary forest plot covering 1 hm<sup>2</sup> in Wuling Mountain nature reserve in Beijing,the method of point pattern analysis was employed to study the spatial distribution patterns and interspecific relationships of main populations in community under different scales.The results showed that: 1) single population distribution pattern presented distinct cluster mode under bigger scale extent in Wuling Mountain and very few ones presented stochastic mode under the scale of less than 3m and exceeding 48 m.2) The distribution patterns of main populations attained maximal congregated intensity.The differences of spatial scales of maximal congregated intensity and maximal congregated size in different populations were distinct,and the descending order of congregated intensity was <i>Tilia mongolica</i>,<i>Betula davurica</i>,<i>Populus davidiana</i> and <i>Betula platyphylla</i>,while the descending order of congregated size of single population was <i>Populus davidiana</i>,<i>Tilia mongolica</i>,<i>Betula davurica</i> and <i>Betula platyphylla</i>.3) interspecific relationships was visible among populations,and the population pairs of negative correlation accounted for a majority of ratio which resulted in furious interspecific competition and unstable composition and structure of community,and its vegetation succession stage was interim from initial to medium.
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Received: 05 September 2007
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