noun
population decrease; population decline
A straightforward compound noun used in news, statistics, and policy discussions.
日本の人口減が続いている。
Japan's population decline continues.
人口減対策として、子育て支援が強化された。
Childcare support was strengthened as a measure against population decrease.
少子化 refers specifically to the declining birthrate, while 人口減 covers overall population decrease including factors like aging and emigration.
Compound of 人口 (population) + 減 (decrease, reduction).