混交林抑制纵坑切梢小蠹危害作用研究

８０年代以来，云南全省云南松林区遭受纵坑切梢小蠹的猖獗危害，造成大量林木死亡。１９９２年在昆明市现有的云南松与栎类、云南松与华山松、云南松与滇油杉混交林及云南松纯林中，设置１１块定位观察样地，观察云南松混交林蠹害发生情况，１９９２～１９９５年经过４年的观察，混交林平均株受害率１０．９％，纯林平均株受害率４８．９％。混交林比纯林降低纵坑切梢小蠹危害率３８．０％。混交林内由于乔、灌、草种类的多样性，带来纵坑切梢小蠹天敌种类的多样性，有效地抑制纵坑切梢小蠹的发生与发展，形成有虫不成灾的生态环境

Study on Inhibitory Action of Mixed Forest to Damage of Tomicus piniperda

Since 1980s, the forest district of Pinus yunnanensis in Yunnan were seriously damaged by Tomicus piniperda in order to monitor the situtation, 11 fixed sample plots were set up in Kunming in 1992, these sample plots were purposely located in 4 different forest types, 3 of mixed forest types are Pinus yunnanensis with Quercus spp., Pinus armandi and Keteleeria evelyniana respectively, another type is pure forest of Pinus yunnanensis. According to 4 years' observation from 1992 to 1995, the results indicated that the average rate of damaged Pinus yunnanensis tree in 3 types of mixed forests was 10.9% and that of pure forest was 48.9% and the latter datum was 38.0% higher than the former, according to analysis, the reason for this results is the plant diversity in mixed forests bring about the diversity of natural enemies of Tomicus piniperda, thus the occurrence and development can be controled effective within the scope of pest disaster.