沙蒿尖翅吉丁幼虫危害特性和空间格局研究

Damage Characteristics and Spatial Distribution of Sphenoptera sp.Larvae

油蒿（Artemisia ordosica Krasch.）为菊科蒿属半灌木,具有耐旱、耐瘠薄、抗风蚀、喜沙埋、结实丰富、采种容易、生长迅速、固沙作用强等特点,是我国重要的荒漠灌木林植物,在荒漠化防治中具有特殊的重要作用。近年来,由于生态环境的改变,灾害性天气频发,我国内蒙古、宁夏、

The damage characteristics and spatial distribution of Sphenoptera sp.larvae population on Artemisia ordosica were analyzed by using biostatistics and geostatistical methods in order to effectively control the insect and to further study the damage characteristics and spatial distribution of the population.The results showed that the larvae of Sphenoptera sp.distributed on the whole plant,but showed a trend of increasing first and then decreasing from top to bottom.However,about 95% of the larvae were concentrated in the roots 8 cm underground.Four theoretical models（spherical,exponential,Gaussian,and linear） were used to represent the observed spatial correlation of larvae and it was found that the spherical isotropic model fitted the best with 3.12 m spatial dependence and 0.98 intensity of local spatial continuity.These indicated that the spatial distribution of larvae followed an aggregation distribution,and the aggregation points were primarily distributed in different areas of the woodland and then spread to the entire woodland.