祁连山红腹牧草蝗雌雄虫空间格局及关联性

应用地统计学的方法,研究了祁连山北坡石羊河上游,6—10月之间红腹牧草蝗Omocestus haemorrhoidalis(Charpentie)雌雄虫的空间分布格局、动态变化及空间相关性。结果表明:红腹牧草蝗雌雄虫的半变异函数为球状模型与高斯模型,二者空间分布类型相同,均呈聚集分布;随时间的变化均呈现"扩散-聚集-扩散-聚集"的动态特征,7—8月之间雌虫的变化强度明显强于雄虫;二者的模糊贴近度指数在0.53～0.71之间,且指数随红腹牧草蝗的生长呈逐渐增加到减少的变化特征,表明雌雄虫在数量与空间上有较强的跟随关系,且跟随关系随红腹牧草蝗的生长发生明显的阶段性变化。

The spatial distribution and association patterns of female and male Omocesstus haemorrhoidalis in the Qilian Mountains

The spatial distribution pattern dynamics and spatial association of female and male Omocesstus haemorrhoidalis （Charpentie） were investigated in the upper reaches of the Shiyanghe river, Qilian Mountain, from June 7 to October 17, 2010. The results show that the semi-variable function of female and male O. haemorrhoidalis can be described by both Spherical and Gaussian models. The spatial distribution pattern of both females and males was aggregative and the change in strength of the female was similar to that of the male. The spatial distribution pattern of this grasshopper had a dynamic trend of diffusion-aggregation-diffusion-aggregation, corresponding to the grasshopper developmental cycle, but the dynamic intensity of the female was stronger than that of the male from July to August. The fuzzy proximity between females and males was within a range of 0.53 - 0.78, implying close synchronization of the sexes in spatial distribution pattern dynamics.