广州话溪母字有[h]、[f]、[k‘]、[j]、[w]等多种读音形式。目前关于溪母字音变的解释均将[k‘]作为最早形式,[h]、[f]、[j]、[w]作为[k‘]之后的音变形式。文章根据[h]在广州话及粤语白读中分布的普遍性及溪母读擦音在客赣粤平方言中的大面积分布,推断[h]为粤语固有的一个早期层次,它是早期壮侗语和汉语接触后遗留下的底层,[k‘]为宋代由中原移民带入的一个较晚的文读层次。[f]是以[-u]为条件从[h]中分化出来的,[j]和[w]则是受同韵摄主元音影响"类化"产生的例外读音。
The initial consonant Xi(溪)is realized as various pronunciations in Cantonese,such as [h],[f],[k‘]and [j],[w].A general claim on this phonological change is that [h],[f]and [j], [w]are derived from [k‘].On the basis of the prevalence of [h]in Guangzhou dialect and in other spoken Cantonese variants,as well as the far-flung distribution of the fricativization of the initial con-sonant Xi in Hakka,Ke,Gan,Yue and Pinghua dialects,this paper argues that [h]is inherited from the original strata in Cantonese,an earliest form resulted from the contacts with Zhuangdong (Kam-Tai)languages and Chinese,while [k‘]is inherited from the written strata caused by migrations from the Central Plain in Song dynasty.And [f]is split from [h]conditioned by the co-occurrence of [-u], and the consonants [j]and [w],are two exceptions caused by the analogy of the main part of a similar vowel of the same she(摄).