论文部分内容阅读
１９９０－１９９２年在安徽省阜阳市和利辛县测定了大袋蛾ＣｌａｎｉａｖａｒｉｅｇａｔａＳｎｅｌｌｅｎ危害兰考泡桐Ｐａｕｌｏｗｎｉａｅｌｏｎｇａｔａ的损叶量和人工模拟危害对泡桐生长量的影响。泡桐的蓄叶量Ｔ（ｃｍ２）与胸径Ｄ（ｃｍ）呈直线关系：Ｔ＝４４５０３．３３６Ｄ－２７２６２７．０４３。大袋蛾幼虫对泡桐的平均损叶量为４７０．９３６ｃｍ２。摘叶量在５０％及其以下时，泡桐生长量没有受到显著影响，摘叶量达到或超过７５％时，生长量即显著下降。泡桐受害允许水平确定为失叶５０％。
1990-1992 in Fuyang City, Anhui Province and Lixin County, the determination of the Cladosomatis Clanelvariensis Snellen damage Paulownia Paulownia Paulownia leaf loss and artificial simulated damage on Paulownia growth. Paulownia leaf accumulating volume T (cm2) and diameter at breast diameter D (cm) showed a linear relationship: T = 44503.336D-272627.043. Larvae moth larvae on Paulownia average loss of 470.936cm2. When the amount of leaves was 50% or less, the growth of Paulownia was not significantly affected. When the amount of leaves was removed or exceeded 75%, the amount of growth was significantly decreased. Paulownia victims allowed to determine the level of 50% of the leaves.