Lexical-semantic and morphological co-development in L2 Chinese: a complex network approach

Abstract

Using a complex network approach, this study explores the co-development of lexical-semantic knowledge and morphological awareness in second language (L2) Chinese learners. By tracking specific network metrics—such as the steady decline in density (ND) alongside non-monotonic shifts in weighted average degree (WAD) in the lexical-semantic networks, and the persistent rise in average degree (AD) in the word-formation networks—across three proficiency levels, we show how learners move from breadth-focused vocabulary growth toward deeper semantic integration, while their characters show enhanced compounding productivity and cohesive morphological linking. A strong correlation between these two competences is observed, with pivotal characters serving as critical links between the networks. While lexical-semantic knowledge and morphological awareness in L2 Chinese learners co-develop with increasing proficiency, they remain distinct from those of native Chinese speakers. These findings underscore the necessity of integrated, targeted, and stage-specific instructional strategies to facilitate the development of learners’ lexical competence. The study also provides practical insights for teaching Chinese as a foreign language (TCFL) through quantitative and visual analyses of L2 development.