中文摘要：

为了解不同放牧强度对荒漠草原植物种群关联对的影响,以不同放牧强度下短花针茅荒漠草原植物种群为研究对象,在苏尼特右旗附近的荒漠草原试验示范基地,设置3个放牧强度试验处理（SA1、SA2、CK）,于2013年8月对不同试验处理区种群存在状况和出现频率进行调查和统计,旨在探讨不同放牧强度下短花针茅荒漠草原植物种群关联关系。结果表明,3个植物种群出现频率受放牧强度影响的敏感程度表现为碱韭〈无芒隐子草〈短花针茅。重度放牧导致显著正相关种对数减少,物种关联链简单,关联物种对较少。在研究的放牧强度范围内,随着放牧强度的增加,植物群落总体关联性呈正联结的变化趋势。短花针茅和无芒隐子草主要表现为无关联性,短花针茅与碱韭主要表现为负关联性,无芒隐子草和碱韭受放牧强度影响,其种间的竞争与亲和作用可以转化。

英文摘要：

Effect of different grazing intensity on desert steppe on population inter-specific relationship was investigated to reveal the influences of different grazing intensity on population relationships in Sonid Youqi, Inner Mongolia. Three different grazing intensity treatments （SA1, SA2, and CK） were set up. The presence state and occurrence frequency of population in different treatments were surveyed on August 2013. The results showed that effect of different grazing intensity on three populations showed Allium polyrhizum 〈 Cleistogenes songorica 〈 Stipa breviflora. Continuous heavy grazing caused a significant decreased species of positive correlation, simple species associated chain and less related species. Within the scope of grazing intensity in this study, community overall correlation showed a positive link trend. Stipa breviflora and Cleistogenes songorica mainly represented unrelated, however, Allium polyrhizum and Stipa breviflora represented negative correlation. The interspecific competition and affinity action between Allium polyrhizum and Cleistogenes songorica can be transformed by grazing intensity affected.