森得保粉剂对木荷林昆虫多样性的影响森得保粉剂对木荷林昆虫多样性的影响.doc

PAGE  PAGE 5 文章编号:1002-2724（2009）04-0008-04 森得保粉剂对木荷林昆虫多样性的影响* 李东文1 ，陈志云1，王玲1，李奕震2** (1.中山市森林病虫害防治检验站，中山 528403；2.华南农业大学林学院) 摘要 在3月和4月，对用森得保粉剂防治油茶尺蛾的木荷林昆虫多样性进行了调查，结果表明：森得保粉剂虽对木荷防火林带林冠层昆虫群落多样性有一定的抑制, 但其极大地降低木荷防火林带林冠层内植食性昆虫的数量，导致植食性昆虫在群落中的比例降低；而对捕食和寄生昆虫的数量影响不大，从而使捕食性和寄生性昆虫所占比例都有不同程度的上升。这对木荷防火林带林冠层昆虫群落的稳定性有一定的促进作用。 关键词: 森得保,木荷,昆虫群落,多样性 中图分类号：S763 文献标识码：A Effects of Sedebao on the Insect Community Diversity of Schima superba’s Stands Li Dongwen1 Chen Zhiyun1 Wang Ling1 Li Yizhen2 （1.Forest Pest Management and Quarantine Station of Zhongshan City,Zhongshan，528403 ；2.College of Forestry，South China Agricultural University,Guangzhou） Abstract：In March and April,The effects of Sedebao(Avermectin and Bt) on the insect community diversity were studied after Biston marginata was controlled with Sedebao in Schima superba’s stands in Zhongshan City，Guangdong province of China. The results showed that although the insect community diversity in the canopy of forest firebreak belt was influenced by Sedebao after its application,the number of phytophagous insects declined sharply,and their ratio decreased in the insect community; and meanwhile, the number of insectivore did not decrease obviously,thus their ratio rised in the insect community. And that had a certain stimulative effect on the stability of the insect community in the canopy of forest firebreak belt. Keywords: Sedebao, Schima superba，insect community,diversity 森得保粉剂主要成分是阿维菌素和Bt，属于生物类杀虫剂，近年来林业上广泛应用于喷杀食叶类的害虫。关于农药防治林间主要害虫对林内生物多样性的影响，国内已经作了一些研究[1-3]。而作为目前林业上应用较广的森得保粉剂对林中昆虫多样性的影响研究未见报导。因此，我们在中山市对用森得保粉剂防治过油茶尺蛾(Biston marginata Shiraki)的木??林进行了昆虫群落多样性的调查，以便为正确评价森得保粉剂在林业上防治害虫的作用提供理论依据。 1材料与方法 1.1调查林地概况 供调查林地的海拔为200m左右，地形为山地丘陵，试验林分纯木荷林防火林带，林龄2~3年，树高1~3m，林分密度为2500株/hm2，林下无植被覆盖。 1.2对林间昆虫多样性影响的调查 于2007年3月下旬,用钙粉Ca（HCO3）2将森得保粉剂（浙江省乐斯化学有限公司生产）稀释30倍，用日本小松MD431A喷粉机对中山市的木荷林防火林带及其周围的阔叶混交林的油茶尺蛾进行防治，防治面积为1113.5 hm2，喷撒稀释后的森得保粉剂15000 kg。在有油茶尺蛾的不同木荷林设置有代表性的处理区和对照区（无喷药）各1个，喷药前7天和喷药后38天，在处理区和对照区分别随机抽取30株木荷，在每株树树冠的东、西、南、北