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安西荒漠鼠类群落结构与环境因子的无偏对应分析

刘定震, 刘NAI发, 宋志明, 潘发成, 宁瑞栋   

  1. 兰州大学生物系
  • 出版日期:2006-07-29 发布日期:2008-01-05

A DETRENDED C0RRESP0NDENCE ANALYSIS 0F C0MMUNITY STRUCTURE 0F DESERT R0DENT AND ENVIR0NM ENTAL FACTORS IN ANXI

LIU Dingzhen, LIU Naifa, SONG Zhiming, PAN Facheng, NING Ruidong   

  • Online:2006-07-29 Published:2008-01-05

摘要: 本文通过对安西荒漠鼠类群落结构与环境因子的无偏对应分析,得出决定鼠类群落结构的环境主导因子因季节不同而有所不同:春季是地下水位、海拔高度、平均降水量和平均气温;夏季是植被覆盖度、植物平均高度、土壤含水率和土壤坚实度;秋季是土壤含水率。综合春、夏、秋三季资料,植被覆盖度、土壤含水率和土壤坚实度是决定鼠类群落结构的环境主导因子。其中水是决定荒漠地区鼠类群落结构的最重要因子。

关键词: 群落结构, 环境因子, 无偏对应分析, 荒漠

Abstract: This study was carried out in Anxi desert,Gansu province from March to Oetober in 1 990.the different type of plant community as sample plots were elected.Nine desert rodent communities were investigated in order to reveal the interrelations between the community structure of desert rodents and the environmental factors,and found out the determinants of community structure. A kind of method of detrended correpondence analysis (DCA)was used by means of computer.
In spring,the locations of 9 communities on the second ordinate axis (information was 37.3 )of DCA was positive correlation with the ground water level,altitude and mean precipitation (r=0.08,p< 0.01;r= 0.81,p< 0.01 respectively),and negative correlation with the mean tempe rature (r=0.83,P< 0.01).
In summer,the locations of 9 communities on the second ordinate axis(information was 36.9 )of DCA was positive correlation with the vegetation coverage,plant height,soil moisture content and soil hard—degree (r=0.86,p< 0.0l;r= 0.62,p< 0.05;r=0.75, p< 0.01;r=0.82,p< 0.01 respectively).
In autumn.the locations of 6 communities on the first ordinate axis(information was 59.8 )of DCA was significantly negative correlation with the soil moisture content (r=0 86,p< 0.01).
In genera1.the locations of 9 communities on the first ordinate axis(information was 60.3 )of DCA was significantly negative correlation with the vegetation coverage,soil moisture content and soil hard—degree (r=-0.89,p< 0.01;r=- 0.63,p< 0.05;r=-0.68,p< 0.05 respectively).The vegetation coverage,soil moisture content and hard—degree were the determinants of community structure of desert rodents in Anxi,furthermore,water was the most important determinant.

Key words: Community structure, Environmental factor, Detrended correspondence analysis (DCA), Desert