This study investigates mechanisms of sound change in Chinese dialects through an ecolinguistic lens, employing the evolution of the entering tone in the Pujiang dialect of Sichuan as a case study. Field research across twelve dialect localities collected pronunciations of 537 entering-tone characters from both elderly and younger speakers, with data analyzed using Jaccard similarity coefficients to assess geographical distribution and Praat-based acoustic measurements to quantify tonal characteristics. Results demonstrate that the entering tone's retention is shaped by ecological factors: dialect points in central Pujiang exhibit approximately seventy percent similarity between generations, whereas peripheral areas adjacent to Chengdu, Ya'an, and Meishan show accelerated convergence toward Mandarin, with similarity dropping to around sixty percent. Intergenerational shifts reveal a systematic redistribution of entering-tone characters into non-entering tonal categories, particularly Yangping, driven by language contact and sociocultural pressures. These findings underscore the utility of ecological linguistics in modeling dialect change, highlighting how geographic and social environments jointly constrain phonological evolution. The study thus offers empirical grounding for dialect preservation strategies while advancing theoretical integration between linguistic ecology and historical phonology.
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