The relationship between L2 vocabulary knowledge and reading proficiency: The moderating effects of vocabulary fluency

In this study, we ascertain the links between the four dimensions of L2 vocabulary knowledge and L2 reading proficiency and the moderating effects of vocabulary fluency. For this purpose, 312 EFL Chinese university student volunteers were recruited from six majors at one tertiary university in Southeast China, and they took a series of vocabulary tests and the IELTS reading test. SEM and PING’S SINGLE INDICATOR INTERACTION methods were adopted to analyze the collected test data. The results indicated that (a) receptive lexical knowledge has a much closer link with reading proficiency than productive vocabulary knowledge; (b) among the four dimensions of L2 vocabulary knowledge, receptive vocabulary depth has a closer connection with reading proficiency than receptive vocabulary breadth; (c) vocabulary fluency has a substantial moderating effect on the connection between L2 vocabulary and reading proficiency; and (d) multiple regression analysis verifies that whole-word knowledge explains 49% of the variance in L2 reading testing grades. We discuss theoretical and instructional implications, focusing on the role of the four dimensions of L2 vocabulary knowledge in the vocabulary assessment criteria for developing L2 reading proficiency.