蓟马对紫花苜蓿危害的空间分布特征  

Spatial Distribution Pattern of the Endangerment Characteristics of Thrip(Odentot hrips lati)to Alfalfa(Medicago sativa)

作　　者：刘玉良[1] 米福贵[1] 特木尔布和[1] 王普昶[1] 马小廷[1] 撒多文[1] 

机构地区：[1]内蒙古农业大学,内蒙古呼和浩特010019

出　　处：《华北农学报》2009年第2期218-222,共5页Acta Agriculturae Boreali-Sinica

基　　金：国家科技部项目(2006BAD10A19-8)

摘　　要：昆虫空间分布格局是其种群的一种客观属性,对于同一种群,其格局类型是固有的。蓟马为一种体型较小的昆虫,取食时移动性强,易逃逸,所以用危害特征的空间分布来代替其本身的空间分布更具有稳定性和实用性。采用不同尺度研究探讨蓟马对紫花苜蓿危害的空间分布特征。研究表明在现蕾期危害空间分布为聚集分布,危害斑块尺度是40 cm×30 cm^50 cm×30 cm的椭圆型,长轴方向是东西向。因此在这一物候期选择抗蓟马材料时,取样应该按南北方向,尺度距离大于40~50 cm,更具有代表性,在开花期危害空间分布为均匀分布,但是取样尺度也应大于40~50 cm,更具有代表性,而且在开花期取样要比现蕾期取样更好一些,会减少取样误差。Spatial distribution pattern of insect is a kind of objective attribute and is inherent. In order to know the spatial distribution pattern of the endangerment characteristics of thrip to Alfalfa, investigation was conducted. Study spatial distribution pattern of the endangerment characteristics of thrip（ Odentot hrips lati ）to Alfalfa（ Medicago sativa ）adopt different scales. The results showed the pattern of Alfalfa belonged to aggregation distribution, and aggregation indices increased with the increase of population densities. By investigating the distribution patterns of spatial distribution pattern of the endangerment characteristics of thrip to Alfalfa, it was found that spatial distribution pattern of endangerment charac- teristics was aggregation distribution and its aggregation degree was 40 cm × 30 cm - 50 cm× 30 cm. On the basic of the research,the optimum sequential sampling was south-north and size was 40- 50 cm in bud phase. In the flower phase, spatial distribution pattern of endangerment characteristics was. Sequential sampling was 40 - 50 cm. Despite its immense potential as an forage species, very little is known about. The spatial distribution pattern of the endangerment characteristics of thrip to Alfalfa and it can be utilized to initiate plant improvement program of the species.

关 键 词：蓟马 紫花苜蓿 不同尺度 危害格局 

分 类 号：S436.634.22[农业科学—农业昆虫与害虫防治] S551.7[农业科学—植物保护]