Scan through the contents of key journals in your subfield, and perhaps set up Table of Contents alerts for them.(see 'Staying Current' tab)
Some ways to identify key journals:
In the library search box, add the term 'periodicals' to your search (e.g. ethnic identity periodicals) - on the results page, relevant journals will be listed at the bottom of the 'Books and Media' column
Do your search in the Scopus database (limiting to the Social Sciences and Humanities Subject Area if appropiate). When the results are displayed, create a graph like the one below, showing the journals that most frequently publish articles in your subject.