论文部分内容阅读
为准确掌握松毛虫的发生量,提高调查精度和预测预报的准确性,选择6块具代表性的林地,对松毛虫蛹、越冬幼虫空间分布型及取样方法进行了研究。研究结果表明,松毛虫蛹及越冬幼虫基本属于聚集分布,蛹期调查取样以Z 字形、越冬幼虫以对角线为最好,调查范围以树冠投影内为宜。本文给出了不同虫口密度下最佳取样株数参数表和越冬幼虫上树虫口估测参数表。
In order to accurately grasp the amount of pine caterpillars and improve the accuracy of investigation and the accuracy of forecasting and forecasting, six representative woodlands were selected to study the spatial distribution and sampling methods of pupae and overwintering larvae of pine caterpillars. The results showed that the pupae and overwintering larvae of the pine caterpillars basically belonged to the aggregation distribution. The pupae were sampled in zigzag and the diagonal of the overwintering larvae was the best. In this paper, the parameter tables of the optimal sampling number under different insect population density and the estimated parameter table of tree-worm population on overwintering larvae are given.