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豆荚螟(Etiella zinckenella)是沙冬青(Ammopiptanthus mongolicus)种子的主要害虫。在宁夏灵武白芨滩国家自然保护区内选择了沙冬青自然生长(羊场湾样地、枣泉样地)和人工栽植(甜水河样地、马鞍山样地)2类生境的4个试验样地,调查了沙冬青豆荚螟幼虫的危害情况,研究了其空间分布型。结果表明:豆荚螟幼虫数量(2.015只·荚-1)、对豆荚的为害率(82.83%)在马鞍山样地最高,其次是甜水河样地(1.423 3只·荚-1,64.83%)和羊场湾样地(1.218 3只·荚-1,59.83%),枣泉样地最低(0.558 5只·荚-1,32.00%),豆荚螟幼虫的数量和为害率在人工栽植生境显著高于自然散生生境,与沙冬青的种群密度呈正相关。基于频次分布指标、聚集度指标及回归分析显示,不论在人工栽植生境还是自然生长生境中沙冬青豆荚螟幼虫的空间分布型均呈聚集分布。沙冬青豆荚螟幼虫Iwao线性回归方程为M*=1.040 66+0.569 02 M(R=0.925 1),表明沙冬青种子害虫豆荚螟个体间相互吸引,种群分布的基本成分为个体群。
Etiella zinckenella is a major pest of the seed of Ammopiptanthus mongolicus. In the Lingwu Baibutan National Nature Reserve in Ningxia, four test samples of natural habitat (Yangmaowan plot, Zaoquan plot) and artificial planted (Tianshuihe plot, Maanshan plot) were selected In this paper, we investigated the damage of the sand-pod borer larvae and studied its spatial distribution pattern. The results showed that the number of larvae of soybean borer was 2.015 pods-1, the damage rate to pods (82.83%) was the highest in Maanshan, followed by that in Tianshui River (1.423 3 pods-1.64.83%) and Yangmao Bay sample plots (1.218 3 pods -1.59.83%), Zaoquan plots the lowest (0.558 5 pods - 1, 32.00%), the number and damage rate of larvae of the pipiesella patens were significantly higher in the artificial habitat In natural niche, there is a positive correlation with the population density of A. sojae. Based on the frequency distribution index, degree of aggregation index and regression analysis, the spatial distribution patterns of A. podophylla larvae showed aggregated distribution both in artificial habitats and in natural habitats. The linear regression equation for Iwao of Spartina fulva was M * = 1.040 66 + 0.569 02 M (R = 0.925 1), indicating that the individuals of Sesamia pockillat were mutually attracted and the basic components of population distribution were individual groups.