内蒙古典型草原草地类型对蝗虫群落优势种群的生态效应

【目的】研究内蒙古典型草原植物群落构成与蝗虫群落构成的生态关系。【方法】运用典型相关、双重筛选逐步回归及冗余分析（RDA）等方法，对由植物特征参数变化导致的蝗虫特征参数变化的生态效应进行分析。【结果】在羊草（Leymus chinensis）草原类型中，羊草生物量损失率与草原蝗虫群落丰富度指数负相关，与毛足棒角蝗（Dasyhippus barbipes）相对多度正相关。在克氏针茅（Stipa krylovii）草原类型和克氏针茅富含杂类草的草原中，克氏针茅生物量损失率与亚洲小车蝗（Oedaleus decorus asiaticus）相对多度呈正相关。【结论】植物群落结构所构成的栖境条件影响蝗虫的群落组成，优势种植物的存在决定优势种蝗虫的存在，优势种蝗虫导致优势种植物高受害率。

Ecological Effects of Typical Grassland Types in Inner Mongolia on Grasshopper Community

【Objective】The objective of this study is to investigate the ecological relationship between plant community structure and grasshopper community structure in the typical grasslands of Inner Mongolia. 【Method】Canonical analysis, double screening for stepwise regression and redundancy analysis (RDA) were used to analyze the relationship between plant community structure and grasshopper community structure. 【Result】 The biomass loss of Leymus chinensis was negatively correlated with the grasshopper species richness index and positively correlated with the relative abundance of Dasyhippus barbipes in the L. chinensis steppe. The relative abundance of Oedaleus decorus asiaticus was positively correlated with the biomass loss of Stipa krylovii in the S. krylovii steppe and the steppe dominated by S. krylovii with the forb diverse.【Conclusion】In the relationship between plants and grasshoppers，probably the habitat condition consists of structure of plant community can cause more effects on community composition of some grasshoppers than the food plants. The existence of the dominant grasshoppers decided by the dominant plants causes high infestation rate of the dominant plants.