数字媒介下公共话语非正式语体的变迁机制——基于“AI + 教育”议题的跨平台语料库分析

The Evolutionary Mechanism of Informal Style in Public Discourse in the Digital Media Era—A Cross-Platform Corpus Analysis on the “AI + Education” Issue

摘要: 本文基于Biber多维度语体分析框架，整合计算机中介交流(CMC)理论与媒介情境理论，构建包含14个指标的“非正式语体核心指标编码体系”。通过对比分析2024~2026年期间传统媒体与社交媒体共22万字的平行语料库，研究发现：社交媒体的非正式语体正向指标综合频率是传统媒体的1.61倍，语体从客观陈述转向对话式表达，情境依赖维度明显增强，形成情境依赖型表达模式，表明数字媒介推动公共话语向非正式语体变迁，并对各指标的媒介效应与文类效应进行了审慎归因。研究进一步构建“公共话语语体变迁的完整因果链”，揭示数字媒介通过情境融合、情感补偿、效率提升等机制推动非正式语体向公共领域延伸的作用路径。本研究为理解数字媒介下公共话语演变提供了实证证据与理论视角，对媒体实践与语言规范建设具有启示意义。

Abstract: This study, grounded in Biber’s multi-dimensional register analysis framework and integrating Computer-Mediated Communication (CMC) theory with Media Contextualism theory, constructs a “Core Indicator Coding System for Informal Register” comprising 14 indicators. Through a comparative analysis of parallel corpora totaling 220,000 words from traditional media and social media during the period 2024~2026, the research reveals that the comprehensive frequency of positive indicators of the informal register in social media is 1.61 times that of traditional media. The register shifts from objective statement to conversational expression, with a marked enhancement in the context-dependence dimension, thereby forming a context-dependent expression pattern. These findings empirically demonstrate that digital media is driving the transformation of public discourse toward informal register. The study also carefully attributed the media effects and genre effects of each indicator. Furthermore, the study constructs a causal chain of “The Complete Causal Chain of Public Discourse Register Evolution”, elucidating the pathways through which digital media facilitate the extension of informal style into the public sphere via mechanisms such as context integration, emotional compensation, and efficiency enhancement. This research provides empirical evidence and theoretical perspectives for understanding the evolution of public discourse in the digital media era, offering significant implications for media practice and the construction of language norms.