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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (10): 173-180.doi: 10.11707/j.1001-7488.20141024

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Spatial Distribution Patterns and the Environmental Interpretations of Basilepta melanopus (Coleoptera:Eumolpidae) adults in Camellia oleifera Young Forests

Li Mi1,2, Zhou Gang1,2, He Zhen1,2, Tan Jicai3, Liu Yuejin4, Wu Yiping5   

  1. 1. Hunan Forestry Academy Changsha 410004;
    2. Camellia oleifera Research and Development Center of State Forestry Administration Changsha 401004;
    3. College of Plant Protection of Hunan Agricultural University Changsha 410128;
    4. Hunan General Station of Forest Pest Management and Quarantine Changsha 410007;
    5. Leiyang Forestry Bureau, Hunan Province Leiyang 421800
  • Received:2013-08-12 Revised:2014-01-10 Online:2014-10-25 Published:2014-11-12

Abstract:

The spatial distribution patterns of Basilepta melanopus adults in Camellia oleifera (tea oil camellia) young forests of three different ages were studied using aggregation index examination and regression analysis. Correlation, multiple linear regression and path analyses were carried out on the relationships between eight environmental factors and the aggregation number of the leaf beetle on tea oil camellia. The eight environmental factors included slope (PD), slopes aspect (PX), slope position (PW), vegetation coverage (ZB), and host plant basal diameter (DJ), height (GD), crown width (GF), the distance from nearby old forests (YJ). Results indicated that the spatial distribution patterns of B. melanopus adults were aggregated in C. oleifera young forests of different ages, i.e., common negative binomial distribution in 1-year-old young forest and tended toward Neyman type A distribution in 3-year-old and 5-year-old young forests. In the young forests, the aggregation of the beetle was caused by environmental conditions. The results of multiple linear regression and path analyses showed that the number of environmental factors influencing distribution of the beetle populations tended to decrease with increasing age of young forest. The YJ and GF were the main environmental factors influencing the aggregation number of the beetle on tea oil camellia. With the increased age of young forest, influence and direct path coefficient of YJ gradually decreased, contrarily, GF become the leading factor in 5-year-old young forest. Migration and dispersal behaviors of B. melanopus adults in young forests were discussed, and the management approach of logging old forests may be necessary to prevent the beetle population from spreading throughout nearby young forest.

Key words: Camellia oleifera, young forest, Basilepta melanopus, spatial distribution patterns, environmental factors

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