論漢語方言日母字的歷時演變

本文利用音韻規律、諧聲串聯和方言比較論證中古日母字源自上古舌根濁塞音合口三等。這個分析不但擺脫文獻兩種構擬 *nz 和 *n 的弊端，成功地詮釋了日母的語音演變，也顧及其它聲母的特殊方音。至於日母的源頭到底是 *g^h 抑或兼有*g、*g^h，暫無定論。本文分析的理論貢獻有：（一）諧聲問題訴諸音變即可，不需擬設複聲母，（二）次濁聲母讀h、x、h、v 是語音演變的必然，無關氣流換道。有別於韻書聚焦個別漢字，本文主張關注以聲符為軸發展出來的群組，並檢視方言音讀，能更全面的掌握漢語音韻的演變脈絡。

關鍵字

日母；諧聲；舌根音唇化

並列摘要

This paper argues that the Middle-Chinese Ri-initial descends from voiced velar stop(s) plus Closed-Mouth Division III in Old Chinese, by means of phonological rules (labiolization of velars), Xiesheng and dialect comparison. This analysis not only gets rid of drawbacks of the two reconstructions *nz and *n in the literature, but also sucessfully explains irregular pronunciations of some Middle-Chinese initials in various dialects. Yet, whether the Ri-initial originates from *g^h or *g, *g^h both awaits further investigation. Two theoretical implications of the current analysis are: (a) consonant-cluster porposals are unnecessary to solve the Xiesheng problem, and (b) pronunciations of h, x, h, v by Cizhuo initials derive directly from sound changes. Different from Qieyun which focuses on individual characters and uses limited dialect materials, this paper advocates that a more adequate and convincing methodology to ensure diachronic developments of Chinese phonology appeals to Xiesheng and a wide range of synchronic phonologies.