间种牧草枣林捕食性节肢动物群落结构的动态

应用群落结构特征参数与主分量分析，对间种不同牧草枣林中捕食性节肢动物群落的结构和动态进行了研究.结果表明，蜘蛛与捕食性昆虫是间种牧草枣林的主要捕食性节肢动物群落，其相对丰盛度分别为48.3%～52.7%和38.8%～ 44.4%.间种不同牧草枣林捕食性节肢动物群落主要类群的平均密度、多样性和均匀度有明显差异(P<0.05)，表现为间作百脉根枣林>紫花苜蓿枣林>扁茎黄芪枣林>白三叶枣林，优势集中性指数为间作白三叶枣林>扁茎黄芪枣林>紫花苜蓿枣林>百脉根枣林.各处理枣林中捕食性蜘蛛类的平均密度明显(P<0.05)高于捕食性昆虫类.瓢甲类、蝽类、蛇蛉类、草蛉类、蟹蛛类、圆蛛类和植绥螨类的个体数量在间种牧草枣林捕食性节肢动物群落中起主导作用.

Community structure and its dynamics of predatory arthropod in jujube orchards intercropped with different herbage species

By using community structural characteristic indices and principal component analysis, this paper studied the community structure and its dynamics of predatory arthropod in the jujube orchards intercropped with Astrugalus complanatus, Trifolium repen, Lotus comiculotus, and Medicago sativa. The results showed that in all test jujube orchards, spider and predatory insects were the predominant components of the predatory arthropod community, and their relative abundances were 48.3%~52.7% and 38.8%~44.4%, respectively. There were significant differences (P<0.05) in the mean density, diversity, and evenness of the most common predatory arthropod groups in the jujube orchards intercropped with different herbage species, with the sequence of intercropped with Lotus comiculotus> Medicago sativa>Astrugalus complanatu> Trifolium repens, but for dominant concentration index, the sequence was intercropped with Trifolium repens>Astrugalus complanatu>Medicago sativa>Lotus comiculotus. The average density of predatory spiders was significant higher (P<0.05) than that of predatory insects in all test jujube orchards. The individuals of Coccinellidae, Pentatomidae, inoccllidae, Chrysopidae, Thomisidae, Araneidae and Phytoseiidae played the dominant role in the community.