论文部分内容阅读
泡桐的木材和花、叶、种子等产品,用途非常广泛,通过连续三年的观察,又发现泡桐叶片还具有粘捕蚜虫的特殊功能。一、调查方法按机械抽样法选择有代表性的样株15—20株,分别在各标准株上选取上、中、下三个不同部位和不同方向的叶片,并做好标记。调查的前一天,先将叶片上粘捕的蚜虫清除掉,次日同一时间进行调查,用预先做好的面积为25平方厘米的铁环,在选取的叶片上随机套取一个部位,记录铁环范围内叶
Paulownia wood and flowers, leaves, seeds and other products, uses a very wide range, through the observation of three consecutive years, also found that paulownia leaf also has a sticky catch aphids special functions. First, the survey method Select by mechanical sampling representative of a sample of 15-20 strains, respectively, in the standard strains of the upper, middle and lower parts of the three different directions and leaves in different directions, and make a mark. On the day before the investigation, the aphids on the leaves were first removed and the same day the next day for investigation. A prefabricated iron ring with an area of 25 square centimeters was used to randomly pick a place on the selected leaves and record the iron Ring within the circle