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通过对比研究,对期刊《地学前缘》2007年影响因子特别高的原因给出了分析,认为高影响因子与实际被引文章的平均被引次数增大及未被引文章数的相对减少直接相关,即相当于在影响因子计算公式中增大了分子并减小了分母,从而使影响因子变大。其深层原因主要是:①《地学前缘》2005～2006年发表的油气类、矿物岩石类和环境污染及治理类文章在2007年被异常多引;②2005～2006年发表的文章在2007年受关注程度较高,89.8%的文章被引用,大大高于影响因子居次高位的2009年的75.2%,同时,引用文章的期刊数比2009年多出23种。分析结果还表明,国家重大项目研究成果的集中发表会对主题性期刊的统计指标有重要影响,它们能产生集团效应,大大提高主题性期刊的被引频次和影响因子。
Through the comparative study, this paper analyzes the reason that the influence factor of “geo-frontier” of periodicals is particularly high in 2007, and considers that the average number of citation times of high impact factors and actual citation articles increases and the number of cited articles is not directly reduced Correlation, that is, equivalent to increasing the numerator and decreasing the denominator in the calculation formula of the influence factor, so that the influence factor becomes larger. The underlying causes are mainly as follows: (1) Articles published in 2005-2006 in the frontier of geology, petroleum and mineral rock, environmental pollution and control articles were abnormally diversified in 2007; (2) articles published in 2005-2006 A high degree of concern, 89.8% of the articles are cited, much higher than the second highest impact factor in 2009 75.2%, while the number of citations cited more than 23 kinds of 2009. The results of the analysis also show that the centralized publication of the research results of major national projects has a significant impact on the statistical indicators of the thematic journals. They can produce the group effect and greatly increase the cited frequency and influencing factors of the thematic journals.