锡林郭勒典型草原植物多样性和蝗虫种群的关系

通过对锡林郭勒典型草原4种群落（羊草＋糙隐子草、大针茅＋羊草、克氏针茅＋冷蒿、克氏针茅＋糙隐子草）的物种丰富度指数、物种多样性指数、生态优势度指数和均匀度指数进行比较分析，对各种指数与蝗虫群落关系进行了研究。结果表明：羊草＋糙隐子草和克氏针茅＋糙隐子草群落的丰富度指数和多样性指数低于大针茅＋羊草群落，但高于克氏针茅＋冷蒿群落，优势度指数高于大针茅＋羊草，均匀度指数低于克氏针茅＋冷蒿群落；克氏针茅＋冷蒿群落的物种丰富度指数和物种多样性指数最低，生态优势度指数较高，群落均匀度指数高于其他3种群落；大针茅＋羊草群落的物种丰富度指数、物种多样性指数最高，优势度指数最低。相关分析表明，蝗虫种类数与均匀度指数极显著相关，蝗虫个体数与物种多样性指数显著相关。

Study on the relationship between plant diversity and grasshopper population in the steppe of Xilinguole

Based on the investigation data about the plant communities in Xilinguole steppe,the richness index,Shannon-Wiener index,Simpson index and Pielou index of 4 types of plant communities on Leymus chinensis+Cleistogenes squarrasa,Stipa grandis+Leymus chinensis,Stipa krylovii+Artemisia friqida,Stipa krylovii+Cleistogenes squarrasa,and the relationships between the plant biodiversity and grasshoppers population were studied by correlation analysis.The results showed that on L.chinensis+C.squarrasa and S.krylovii+C.squarrasa,the richness index and Shannon-Wiener index of the communities were lower than those on S.grandis+L.chinensis but higher than those on S.krylovii+A.friqida,and the Simpson index was higher than that on S.grandis+L.chinensis but the Pielou index was lower than that on S.krylovii+A.friqida.On S.krylovii+A.friqida,the richness index and Shannon-Wiener index of the plant communities were the lowest,while the Simpson index was higher and the Pielou index was the highest.On S.grandis+L.chinensis,the richness index and Shannon-Winner index of the communities were the highest,while the Simpson index was the lowest.The correlation analysis showed that grasshopper species number had very significant effects on the Pielou index,and grasshopper individual number had significant effect on the Shannon-Winner index.