二种天牛对濒危植物四合木的危害

在内蒙古西鄂尔多斯国家级自然保护区内,采用野外观察、随机抽取样方,结合解剖病害植株,对危害四合木（Tetraena mongolica Maxim）的2种天牛红缘天牛Asias halodendri（Pallas）和槐绿虎天牛Chlorophorus diadema（Motschulsky）的为害株率和为害特点进行研究。结果表明,2种天牛对四合木的危害十分严重,将成为导致四合木近期灭绝的主要威胁;在整个保护区范围内,4个地段的为害程度不同,2种天牛的分布情况也不同;2种天牛的危害特点以及对寄主造成的危害也有显著差别。

Damage of two species of iongicorn beeries to Tetraena mongolica

The damage of two species of longicorn beetle Asias halodendri （Pallas） and Chlorophorus diadema （Motschulsky） to Tetraena mongolica Maxim was studied at the west Ordos National Nature Reserve in Inner Mongolia with the approaches of field observation, quadrat method and anatomizing infected plants. The results showed that these 2 species of longicorn beetles had caused severe damage to T. mongolica, which would be the main threat of extinction of T. mongolica. The damage rates were different among 4 sections in the reserve. The distribution, damage characteristics and damage on host varied significantly between the 2 species of longicorn beetles.