Study on population composition and quantity change of rodents in Kaijang county of Sichuan province

Objective To study the population composition and quantity change of rodents in Kaijiang county, Sichuan province, so as to provide basic information for rodent control. Methods The rodents density was investigated by night trapping in the indoors and outdoors. Results The rodent density in the field was higher in 1989-1990 and 1992-1993, reaching about 18.85%-26.57% and steady in 4.21%-14.88%. The rodent density in the indoors was in the peak in 1986 (9.47%), and it was 1.96%-7.26% in other years. The rodent density in the field rodent was higher than that in the indoors. The dominant species were Apodemus agrarius (51.59%), Anourosorex squamipes (27.36%) and Rattus noregicus (18.68%) in the field. However, The dominant species in the indoors were R.norvegicus (64.32%), Mus musculus (26.58%) and An.squamipes (7.99%). The dominant species exchanged in different years. Conclusion The rodent density and its population dynamics were affected by density dependent factor and non-density dependent factor in the field, but that in the indoors was relative to the control of rodent.