Abstract: An experiment with three quadrants（20m×50m）was conducted to monitor the locations of plants and the number of new and old mounds in the habitat of Myospalax aspalax in natural ground in Baiyinkulun pasture, Xinlinguole, Inner Mongolia from 2013 to 2015. The relationships between the number of new and old mounds and plant biomass, plant number and species were analyzed by Partial RDA (Partial Redundancy Analysis). The results showed that in spring, the number of new zokor mounds was positively correlated with the axis-rooted system and creeping-root system which accounted for much of the variation. The number of old mounds of zokor was positively correlated with sparse grove system. The number of old mounds was negatively correlated with the axis-rooted system and creeping-root system, and accounted for much of the variation. In autumn, the number of new mounds of zokor was positively correlated with the sparse grove system, dense clumping system and creeping-root system, and accounted for much of the variation. The number of old zokor mounds was positively correlated with the sparse grove system, dense clumping system and creeping-rooted system, and accounted for much of the variation. These results suggest that there were seasonal differences in zokor’s mound-forming activity and micro-habitat selection, and those activities were affected by food resources. Axis-rooted system and creeping-root system had significant effects on the spring activities of zokor, while the the sparse grove system, dense clumping system and creeping-root system had important effects on zokor's autumn activities.

Key words: Mound, Root system type, Micro-habitat selection, Seasonal differences

摘要： 本研究于2013-2015年的5月（春季）和9月（秋季），在锡林浩特市南部白银库伦牧场的天然草地监测草原鼢鼠（Myospalax aspalax）生境中植被情况及新旧土丘数量，采用偏冗余分析的方法研究了新旧土丘数量与植物地上生物量的干重、株丛数和物种数之间的关系。结果表明：5月鼢鼠新土丘数量与轴根型、根蘖型植物呈正相关且具有较大解释量。鼢鼠旧土丘数量与疏丛型植物呈正相关，与轴根型和根蘖型植物呈负相关，且具有较大解释量。9月鼢鼠新土丘数量与疏丛型、密丛型和根蘖型植物呈正相关且解释量较大。鼢鼠旧土丘与疏丛型、密丛型和根蘖型植物呈正相关且解释量较大。这些结果说明草原鼢鼠的造丘活动和微栖息地选择和食物资源有关，存在季节差异。轴根型和根蘖型植物对鼢鼠的春季活动有重要影响；疏丛型、密丛型和根蘖型植物对鼢鼠的秋季活动有重要影响。

关键词: 土丘, 根系类型, 微栖息地选择, 季节差异