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陕西地区啮齿动物种数分布与生态因子关系的分析

李晓晨,王廷正   

  1. 陕西师范大学生物系,西安
  • 出版日期:2006-07-25 发布日期:2008-07-07

AN ANALYSIS 0F RELAT10NSHIP BETWEEN EC0L0GICAL FACT0RS AND NUMBER 0F SPECIES 0F R0DENTS IN SHAANXI DISTRICT

LI Xiaochen,WANG Tingzheng   

  • Online:2006-07-25 Published:2008-07-07

摘要: 初步分析了陕西地区啮齿动物种数分布与生态因子之间的 系。根据自然地理概况,将陕西地区划分为七十啮齿动物地理区。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问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数之间呈显著正相关。对秦岭、大巴山地区啮齿类的垂直分布也进行了分析。结果表明,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,啮齿类物种教越丰富。此外,农业活动对啮齿类物种敦也有影响,即耕作区种数少于非耕作区。

关键词: 牙齿类, 多样性, 生态因子

Abstract: This paper preliminarily analysed the relationship between ecological factors and the number of species of rodents in Shaanxi district.According to geographical features,Shaanxi distriect was divided into seven geographical regionsof rodents:desert area alongthe Great wall,north Loess Plateau,south Loess Plateau,Guanzhong plain,Qin-ling mountain district,Hanjiang basin and Dabashan mountain district.Four ecological factors which possibly affect the number of species of rodents in different zoogegographical
regions were studied with multiple linear regression analysis· Regression equation
was Y =-4.72+2.69x1+ 3.79×10-2X2+ 0.1lX3+9.45× 10-4X4(RR= 0.997,P< 0. 05)The computation results summed above indicated that there were positive correlation between the number of species and temperature(X1),precipitation (X2),percent—age of forest areas (X3) and areas of each zoogeographic Mregion.Higher temperature
and adequate precipitation are good for plant growth which is indispensable to rodents.Forests offer rodents hidden places and foods.The regression equation also pointed out that area cast less inluence on the number of species than other factors did.The vertical distribution of rodents was also studied. The correlation coefflcient between heigt and the number of species was --0.85,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 ,there were more species of rodents.

Key words: Rodents, Diversity, Ecological factors