| 摘要: |
| 应用5种聚集度指标和Iwao法、Taylor幂法则,分别考查了2003年3—9月份朝鲜球坚蚧(Didesmococcus koreanus Broch)在梅树上的分布型及其变化动态。结果显示:该蚧在梅树不同方位和冠层的枝条上以及所有密度下均呈聚集分布,分布基本成分为个体群,且个体间相互吸引。该虫以上层和南向树冠的聚集度最高,下层和北向树冠的聚集度最低,这种差异与该蚧的生物学特性和环境的异质性有关。不论蚧体在上、中或下层树冠,都明显呈现出前期高聚块,4月下旬后由于黑缘红瓢虫天敌的捕食作用使其聚集强度呈逐渐降低的趋势。在空间分布格局研究的基础上,提出了理论抽样数公式,给出了不同密度和误差要求条件下的最适抽样数及一定防治指标下的序贯抽样模型。 |
| 关键词: 朝鲜球坚蚧 空间分布格局 序贯抽样 时序动态 梅园 聚集度 |
| DOI：10.11841/j.issn.1007-4333.2007.01.009 |
| 投稿时间：2006-07-03 |
| 基金项目:国家自然科学基金;安徽省教育厅自然科学基金 |
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| Dynamics of spatial pattern of Didesmococcus koreanus Broch population in plum orchard |
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| Abstract: |
| Spatial pattern and time-series dynamics of Didesmococcus koreanus Broch were analyzed by calculating five indices of aggregation,and parameters of Iwao model and Taylor's power law model from March to September.The results showed that the spatial pattern of D.koreanus in horizontal and upright dimension,at different directions,altitudes and population density in plum orchard was in an aggregated distribution pattern,and the fundamental component was the group composed of several individuals.The Aggregation intensity of D.koreanus was the highest in upper and southern part of the crown,and the lowest in its lower and northern part.The aggregation was due to the biological habits of D.koreanus and environmental heterogeneity.Whether D.koreanus was in the upper,middle,or lower crown of the plum tree,its aggregation intensity was higher before mid-ten days of April,and then gradually decreased after the last ten days of April because of preying by natural enemies,e.g.,Chilocorus rubidus Hop.Based on data for the spatial distribution,the model of the most suitable sampling intensity is established and the suitable sampling intensity at different densities of D.koreanus and error level is presented.The sequential sampling diagram was drawn to investigate the D.koreanus population levels in a plum orchard. |
| Key words: Didesmococcus koreanus Broch,spatial pattern,sequential sampling,time-series dynamics,orchard,aggregation |
