| 摘要: |
| [目的]明确苹果树冠金纹细蛾幼虫发生的时空动态,为金纹细蛾管理提供理论依据.[方法]在陕西洛川果区选择样地果园,以5点取样法定位抽样点,每样点选定代表树1株,将立体树冠划分为20个资源单位,每个资源单位随机抽取20片叶调查统计金纹细蛾种群数量.并用Excel和Dps软件对数据进行分析.[结果]洛川果区6月中旬金纹细蛾幼虫显现,7月下旬起明显增加,9月种群数量呈指数上升,10月最高.种群数量在树冠的分布态势呈下层>中层>上层、北>东>西>南,其中树冠中层和下层又以内侧>外侧,水平方向各方位间种群数量差异不显著,垂直方向上层与下层间差异极显著,上层与中层、中层与下层差异显著,表明该虫属于喜阴,喜湿昆虫.金纹细蛾幼虫在苹果树冠的分布为聚集型,但聚集度较小,个体间吸引且有个体群出现,种群数量在树冠20个方位上的相近度不同,构成了不同层次上的亚层结构,分为密集区、过渡区和稀少区.[结论]在时间动态上,7月份以后是金纹细蛾种群控制的关键时期,10月份为减少来年虫源的最佳期;在空间动态上.苹果树冠中下层的内侧为重点防治部位,且树冠以3点取样调查为宜. |
| 关键词: 金纹细蛾幼虫 空间结构 分布型 亲疏关系 |
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| 基金项目:陕西省农业科技攻关项目，世界银行资助项目 |
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| Spatial distribution pattern of larvae of Lithocolletis ringoniella in the crown of apple trees |
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| Abstract: |
| 【Objective】 In order to offer theoretical gist for the management of Larvae of Lithocolletis ringoniella Mats,this study made clear the space-time dynamic of Larvae of Lithocolletis ringoniella Mats. 【Method】 In the sample orchard five sample spots were chosen,and one tree in every spot.The crown of a tree carve was divided into up twenty units and twenty leaves at every unit were researched and the number of group calculated.Finally the data were analyzed by Excel and Dps.【Result】 The results show that larvae of Lithocolletis ringoniella Mats.appeared in the middle of June，increased obviously in the population，went up in exponentially in September and reached peak in October.The population was distributed spindly in the crown in a pattern of lower part ＞middle part＞upper part;north part＞eastpart＞west part＞south part and inside crown of middl below＞outside,indicating Lithocollet ringoniella liked shadow and moisture habitate.Insignificant differences existed at horizontal orientation,and there were great significant differences between upper part and lower part, significant differences between upper part and middle part or upper part.The discrepancy and similarity index of larvae of Lithocolletis ringoniella was different at different orientations.Lithocollet ringoniella larvae were cluster community in the crown,distributing in different hierarchies within the crown which can be divided into densely clustered layer,transitional layer and sparsely clustered layer. 【Conclusion】 July is the key time for controlling group form time dynamic,while October is the best time for reducing the number of insect fountain.The middle part and lower part are important parts in managing,so we can research three sampling spots for Lithocolletis ringoniella. |
| Key words: Lithocollet ringoniellaLarvae spatial distribution distribution pattern intimacy degree |
