An empirical study on adaption of Standard Japanese sound in two-pattern dialects of Kyushu Japanese

在九州日语的两种方言中，借词与复合词在语音上对标准日语的适应是不同的。对于外来词来说，标准日语的语音特点决定了方言中的声调。另一方面，复合词的声调取决于复合词前成分的声调类型和莫拉长度。然而，我们发现标准日语中含有去重音语素的复合词在方言中也是去重音的。因此，方言的语音系统逐渐受到标准日语语音的影响。

In two-pattern dialects of Kyushu Japanese, loanwords form a different category from compounds in regard to sound adaptation from Standard Japanese. For loanwords, phonetic feature of Standard Japanese determines tone in dialects. On the other hand, tone of compounds depends on a tonal type and mora length of former element of compounds. We, however, found that compounds which contain deaccented morphemes in Standard Japanese are also deaccented in a dialect. Thus, sound system of dialects is affected gradually by sounds of Standard Japanese.