筛胸梳爪叩甲是我国南方地区重要的笋期害虫。研究了林间挖笋除虫、黑光灯诱杀及药剂防治3种方法对筛胸梳爪叩甲的控制效果。结果表明:3种技术措施均能显著降低该虫的危害率和虫口密度,其中药剂防治效果最明显。3 a持续挖笋除虫的防治效果达(22.76±3.90)%;每年单盏黑光灯年平均诱捕量可达(1 143.8±318.7)头,连续6 a的灯光诱杀可将竹笋危害率由防治前的(56.05±2.83)%降至防治后的(39.21±2.83)%;连续施用5%辛硫磷+3%毒死蜱颗粒剂3 a年可将竹笋危害率由防治前的(69.62±5.36)%降至(21.17±7.65)%,防治效果达(70.11±10.99)%。

对2007年到2009年盐池柳杨堡人工封育区三块受不同干扰程度的样地内群落植被进行样方调查,分析所得数据研究封育区不同干扰程度对群落组成、植被特征值及物种多样性的影响,从而为当地草地生态系统的恢复提供科学依据。结果表明:轻度干扰下的封育外围区拥有较高的生物特征值及较低的物种多样性;重度干扰下的未封育区拥有较高的物种多样性及较低的生物特征值;未受干扰的封育核心区拥有中等程度的生物特征值和较高的物种多样性,但其物种多样性随封育时间的增长出现下降的趋势。

Dasychira dudgeoni is one of the main insect pests on Camellia oleifera in southern China. So far, there are no reports on the biocharacteristics of this insect. In this study, the biological characteristics of D. dudgeoni were investigated by field survey and laboratory observation. D. dudgeoni has 2—3 generations each year, and overwinters as eggs in Zhejiang Province. The eggs hatch during late February and early March. The first to third instar larva feed on the lower surface of leaves or the pericarp of the fruit. Later they feed mainly on leaves. The mature 5th instar larva move to lower leaves and combine two complete leaves by spinning silk into a ridge shaped cocoon then pupate inside. The female adults stay on the surface of the cocoon waiting for the male adult to mate. And the next day, the females lay eggs on the cocoon, then fly to the lower surface of leaves to oviposit.

本文对油松两批种源(共36个)在甘肃四个试验点的生长等性状进行了观测研究。所得的资料进行单点、多点方差分析和相关分析。结果表明:种源间差异极显著,种源与立地存在一定的交互作用,种源生长与年龄呈极显著正相关,油松地理变异趋向于不连续变异的格局。经17个变量的主分量分析和各种源生态价、生产力的计算,将参试油松种源分成速生型、中生型和慢生型三类。分布在陕西、河南一带的种源适应性强,生长速度快;分布在边缘地带的种源,普遍生长缓慢。并综合选择出一批适合甘肃不同气候类型的优良种源。