陕西省啮齿动物种数分布及其生物多样性的研究

目的 研究陕西地区啮齿动物种数分布及与生态因子、海拔高度、景观类型之间的关系。方法 用多元线性回归法，得出回归方程。结果 根据自然地理概况，陕西地区划分为6个啮齿动物地理区。对不同地理区内可能影响啮齿动物种数的4种生态因子与啮齿类物种数之间进行多元线性回归分析。结果表明，气温、降雨量、森林覆盖率及面积与啮齿类物种之间呈显著正相关。对秦岭、大巴山地区啮齿类的垂直分布进行分析，啮齿类物种数与海拔高度呈显著负相关。啮齿动物种数与景观类型也有密切关系，景观类型越复杂，啮齿类物种数越丰富。结论 与环境密切相适应的啮齿动物与各种生态因子有着密切的关系，生态因子影响啮齿类多样性。

Study on Diversity and Distribution of Rodents in Shanxi Province

Objective To study the relationship between ecological factors and the number of species of rodents in Shanxi province. Methods The multiple linear regression analysis. Results According to geographical features, Shanxi province was divided into six geographical regions of rodents: desert area along the Great Wall, Loess Plateau, Guanzhong plain, Qinling mountain district, Hanjiang basin and Dabashan mountain district. Four ecological factors which possibly affect the number of species of rodents in different zoogeographical regions were studied. The results showed that there were positive correlation between the number of species and temperature, precipitation, percentage of forest areas and areas of each zoogeographical region. Higher temperature and adequate precipitation were good for plant growth which was indispensable to rodents. Forests offer rodents hidden places and foods. But area casted less influence on the number of species than other factors did. The vertical distribution of rodents was also studied, which indicated that the number of species of rodents went down as heigt got higher. The natural landscape also cast influence on the species diversity, in another word, the more complicated the natural landscape was, the more species of rodents there were. Conclusion The ecological factors cast influence on the species diversity of rodents.