JCR林学期刊指标动态变化及其学术影响力评价

JCR期刊指标数据库以其期刊质量高、数据准确而受到广泛关注。对近10 a JCR期刊指标数据分析结果显示，世界林学学科的期刊种数、论文数、被引频次及其占总学科百分比均有逐年增加的趋向，林学期刊被引半衰期高于JCR总学科，表明林学研究领域不断拓宽，科研产出量的增加和学术影响力的提高速度均高出总学科平均水平，林学科研发展速度相对较快。对期刊指标概念内涵及指标值分析结果表明，期刊标准特征因子NEF和标准论文影响分值NAIS克服了期刊影响因子IF的诸多缺陷，是最能真实反映林学学科期刊整体影响力和论文平均影响力的评价指标，且二者分别对林学期刊整体影响力和论文影响力的评价结果有较大个体和分区差异，根据实际需要选择使用，可使评价结果更科学、合理。

Changes of JCR Forestry Journal Indices and Evaluation of the Academic Impact

The index database of JCR (journal citation reports) attracts extensive attention for its high quality and accuracy.The analysis results on JCR journal index data in recent 10 years showed that indices related to forestry science increased annually,including the number of forestry journals and articles,citation frequency,percentages of forestry science in all the disciplines.The cited half-life of forestry journals was higher than the average of JCR journals.It showed that the research field of forestry was expanding,the increase of scientific research output and academic impacts were higher than the average level of the general discipline,and the development speed of forestry scientific research was relatively fast.The results of the analysis on the concept and value of journal index indicated that NEF (normalized eigen factor) and NAIS (normalized article influence score) could most truly reflect the overall and the average impacts of the articles of forestry discipline journals,because NEF and NAIS overcame many weaknesses of IF (impact factor) index.However,significant differences in the evaluation results of the forestry journal existed,the selection of the evaluation indices should be meet the actual needs to make the evaluation results more scientific and reasonable.