How does the Dumky Trio use contrasting moods from Ukrainian folk music?

In his Dumky Trio, Opus 90 (1891), Antonín Dvořák utilizes the dumka—a Ukrainian folk music form—to create a work defined by extreme emotional contrast.12

A dumka is traditionally characterized by its shifting moods, typically alternating between profound melancholy and sudden, wild abandon. In the Dumky Trio, which contains six of these pieces, Dvořák stresses this element of contrast to the utmost, using the structural flexibility of the form to transition rapidly between these opposing states. By juxtaposing these disparate temperaments, Dvořák captures the spirit of the folk tradition while showcasing his own talent for melodic invention and rhythmic vitality.231