What are the development characteristics of poetry in the Southern and Northern Dynasties?

During the Southern and Northern Dynasties, the South experienced the Song Dynasty of Emperor Wu of Song Dynasty, namely Jin, Qi, Liang and Chen. After the national subjugation of the Western Jin Dynasty, the north entered the period of Five Lakes and Sixteen Countries. In the Southern Dynasties, the society was relatively stable and the economy developed, but the emperors and gentry were increasingly decadent and dissolute. Poetry flourished in the literature of the Southern Dynasties. Although his poems reflect the social reality and are narrow, they have made great progress in artistic forms and techniques.