【摘要】 为了探讨草原沙化和人工固沙区植被恢复演替过程中昆虫群落组成、营养结构、多样性及稳定性的变化 ,在宁夏沙坡头自然保护区 ,利用随机和定点抽样法对上述二过程中不同地段的昆虫进行了调查。结果表明 ,随着沙化程度的增加和人工固沙区植被演替时间的延长 ,昆虫群落组成的复杂化和多样性呈现为负向和正向增加的变化趋势 ,但表现在群落组成结构、演替时间与方向上并不完全一致。随着沙化程度的加重 ,群落中天敌昆虫比率明显下降。在两个演替过程中 ,昆虫群落稳定性表现出下降趋势 ,但群落优势种的组成和不稳定机制明显不同。更多还原

【Abstract】 In order to explore the dynamics of insect communities in the two successional series of steppe desertification and artificial sand fixed vegetation recovery,the composition,trophic structure,diversity and stability of insect communities were studied in four respective regions with different stages of desertification and artificial sand fixed vegetation in the Shapotou Natural Reserve,Ningxia,China.It was indicated that the complexity and diversity of insect community compostition and the percentage of enemy insects tended to decrease with the aggravation of desertification and increase with the prolongation of artificial vegetation.However,these findings were not completely consistent with respect to the composition,successional period and stages of insect community.The stability of the insect communities tended to decrease in the two processes,but the composition of the dominant species and the stabilizing mechanism of insect communities were significantly different.更多还原