高山草地蝗虫群落生物多样性和空间聚集强度对植物群落的响应

为明确高山草地蝗虫群落生物多样性和空间聚集强度变化及其对植物群落的响应，在位于甘肃省祁连山中段北坡的研究区调查温性草原、山地草甸和高寒草甸3类草地中的蝗虫种类和数量，对不同蝗虫群落进行生物多样性分析，并观察不同蝗虫种群的聚集程度。结果显示，共捕获蝗虫15种，8月温性草原内蝗虫虫口密度最大，为8.17头/m²，且此时Shannon-Wiener指数和Margalef丰富度指数均最大，分别为1.58和2.27；7月蝗虫群落的空间聚集程度高于其他两类草地。山地草甸和高寒草甸中蝗虫空间聚集高峰出现在8月，晚于温性草原。东亚飞蝗Locusta migratoria manilensis种群的空间聚集程度最高，其次为白边痂蝗Bryodema luctuosum、狭翅雏蝗Chorthippus dubius和小翅雏蝗Chorthippus fallax种群，鼓翅皱膝蝗Angaracris barabensis种群的聚集程度最弱。冗余分析结果显示，蝗虫群落种类组成和数量以及空间聚集强度与植物群落生物多样性、覆盖度和高度存在显著相关性。

Responses of the grasshopper community biodiversity and pattern intensity to the plant community

To clarify the changes of biodiversity and spatial aggregation intensity of grasshopper communities and their responses to plant communities, three grassland types, namely temperate steppe, mountain meadow and alpine meadow, were selected to investigate the grasshopper community abundance and species in the northern slope area of the middle part of Qilian Mountains. The biodiversity of different grasshopper communities was studied, and the aggregation degrees of different grasshopper populations were observed. A total of 15 species of grasshoppers were caught during the study period. During the sampling period in August, the grasshopper community density (8.17 individual/m²), Shannon-Wiener index (1.58) and Margalef index (2.27) were the highest in the temperate steppe. The degree of grasshopper community aggregation was stronger in temperate steppe than in mountain meadow and alpine meadow. The aggregation peak in mountain meadow and alpine meadow occurred in August. The aggregation degree of Locusta migratoria manilensis was the highest, followed by those of Bryodema luctuosum, Chorthippus dubius and Chorthippus fallax. The aggregation degree of Angaracris barabensis was the weakest. Redundancy analysis showed the close relationship between the spatio-temporal dynamics of grasshopper community and plant community diversity, coverage and height (P<0.05).