本文提出"元话语名词"概念及其"引导"和"互动"双重功能维度.基于多学科学术论文语料库的数据分析, 本研究发现, "限定词+元话语名词"是频次最高的语法结构, 而且在引导功能方面, 该结构主要用于回指上文信息, 并表达作者界定物质信息的互动立场.人文学科作者较理工作者更倾向于使用元话语名词构建学术语篇与人际互动;作者随着行文结构发展调整元话语名词的功能应用, 从而增强语篇的说服力.元话语名词可以丰富我们对名词功能的现有认识, 扩展学术语篇人际互动的研究视角.%This paper proposes a particular type of unspecific abstract nouns as "metadiscursive nouns" and emphasizes its rhetorical functions in both interactive and interactional dimensions. Based on a corpus of research articles across disciplines, it is found that "determiner + N" structure is most common, mainly used to set up anaphoric reference to prior discourse while expressing authorial stance of defining research entities. Results also show that metadiscursive nouns are more frequently used in the liberal arts than science and engineering domains in the rhetorical construction of social interaction and academic knowledge. The author adjusts the rhetorical use of metadiscursive nouns across sections of research articles in an endeavour to build up the persuasiveness of academic argumentation. Therefore, metadiscursive nouns add to our current knowledge of functions of nouns in discourse and contribute a new analytical perspective on textual interaction in academic discourse.
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