以1999-2003年生物技术学科期刊文献分布曲线为依据,利用知识密度梯度graduR(n)的概念,对知识场中文献分布特征进行分析。结果表明,在任何一个学科的知识场中,集中区文献分布呈间断性变化,离散区文献分布呈连续性变化,从而构成期刊文献分布的基本特征。基于此,指出期刊文献分布特征研究是对文献分布规律的进一步描述。 Based on the literature distribution curve of biotechnology disciplines from 1999 to 2003, the concept of knowledge gradient gradient graduR (n) was used to analyze the distribution characteristics of literature in knowledge field. The results show that in the field of knowledge of any subject, the distribution of documents in the centralized area changes intermittently, and the distribution of documents in the discrete area changes continuously, which constitutes the basic characteristics of the distribution of periodical literature. Based on this, it is pointed out that the research on the distribution characteristics of journal literature is a further description of the law of document distribution.