陕西吴起县生态恢复区直翅目昆虫的多样性

应用多样性指数、主成分分析及多元逐步回归等方法,对陕西吴起县生态恢复区直翅目昆虫的群落结构,植被因素与直翅目昆虫群落特征的相关性进行研究。共获得标本1 155号,隶属于10科17属,共计20种。黄胫小车蝗Oedaleus infernalis Saussure,宽翅曲背蝗Pararcyptera microptera meridionalis,短星翅蝗Calliptamus abbreviatusIkonn分别占总数量的17.58%,15.15%和14.89%,共同构成该地区直翅目昆虫的优势类群。多样性的变化趋势是县城>白豹>周湾>王洼。对各生境植被因素和直翅目昆虫群落所进行的主成分分析,两维主成分的累计方差贡献率分别达到了95.299%和86.304%。影响直翅目昆虫种类和数量变化的植被因素有草本植物高度多样性、草本植物种数、菊科优势度、禾本科优势度、其他科优势度。

Orthopteran diversity in ecologically restored area in Wuqi County, Shaanxi

Structure of orthopteran communities,correlations between vegetation factors,and orthopteran communities characters in ecologically restored area of Shaanxi Wuqi were studied by means of diversity index,principal component analysis and stepwise regression.A total of 1 155 orthopteran individuals were collected,belonging to 20 species.Three of them are considered as dominant ones: Oedaleus infernalis saussure accounted for 17.58% of the total in number,Pararcyptera microptera meridionalis 15.15%,and Calliptamus abbreviatus Ikonn 14.89%.The variational trend of diversity index by county is Wuqi downtown > Baibao > Zhouwan > Wangwa.By the stepwise regression analysis,there are several vegetation factors,e.g.,grasses height diversity,grasses species number,Compositae dominance degree,Gramineae dominance degree and other grasses dominance degree,affect the species and numbers of Orthoptera.