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对《中文核心期刊要目总览》(2008年版)收录的137种农业核心期刊的分类标引进行了统计,有分类标引的期刊117种。对有分类标引的期刊每刊随机抽取1篇论文对其分类标引结果,(即中图分类号)进行分析表明:分类正确的101篇,错误的16篇,正确率86%,分类级别主要为4~6级。分类标引存在的主要问题是标引错误或印刷错误、重复标引、标引专指度太低和标引不适度。
A total of 117 types of agricultural core journals are listed in the “Overview of Essentials of Chinese Core Journals” (2008 edition), with 117 kinds of journals indexed by category. For each periodical with periodical indexing, 1 article was randomly selected for each periodical to analyze the results of its classification and indexing (ie, the CLC classification number): 101 correctly classified, 16 incorrect, 86% correctly, and the classification level Mainly 4 to 6 levels. The main problems existing in classification and indexing are indexing errors or typographical errors, repetitive indexing, indexing of special degrees and indexing inappropriateness.