To determine the triad being performed in the bass clef on the first beat of measure two, you would need to identify the notes being played on that beat. Unfortunately, I can’t see the specific musical excerpt you're referring to.
In a typical analysis, a D minor triad consists of the notes D, F, and A; a D major triad consists of D, F#, and A; a B minor triad includes B, D, and F#, and a B major triad consists of B, D#, and F#.
Check the notes on the bass clef for measure two and see which ones align with these triads. If you can provide the actual notes, I would be happy to help you determine the correct triad.