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通过对我国3302种自然科学类期刊2005～2007年自引率的统计分析,确定了我国自然科学类期刊各年度自引率的正常参考值,从而为界定我国自然科学类期刊的过度自引提供参考依据。调查结果显示:2005～2007年我国自然科学类期刊的自引率呈逐年下降趋势,自引率高限分别为0.323、0.299和0.285,呈过度自引的自然科学类期刊分别有249种、255种和228种;环境与生命科学类期刊自引率高限分别为0.325、0.313和0.294,呈过度自引的期刊分别有28种、29种和28种;科技与生产类期刊自引率高限分别为0.343、0.318和0.305,呈过度自引的期刊分别有121种、119种和117种;医药科学类期刊自引率高限分别为0.306、0.267和0.245,呈过度自引的期刊分别有60种、65种和65种;农业科学类期刊自引率高限分别为0.277、0.278和0.268,呈过度自引的期刊分别有35种、37种和27种。
Through the statistical analysis of the self-citation rates of 3,002 natural science journals in China from 2005 to 2007, the normal reference values of self-citation rates of natural journals in China are determined, which will provide a reference for defining the excessive self-citation of natural science journals in China . The survey results show that from 2005 to 2007, the self-citations of natural science journals in China declined year by year with the self-introduction rates of 0.323, 0.999 and 0.285, respectively. There were 249 natural periodicals 228 species, journals of environmental science and life science were 0.325,0.313 and 0.294 respectively, 28 species, 29 species and 28 species were overly self-referring journals. The highest self-citation rate of technology and production journals was 0.343 , 0.318 and 0.305 respectively. There were 121 species, 119 species and 117 species in over-self-cited journals respectively. The highest self-cited rates of medical journals were 0.306, 0.267 and 0.245, respectively, And 65 kinds of journals. The highest self-citation rate of agricultural journals was 0.277, 0.278 and 0.268, 35, 37 and 27 journals respectively.