What poetic style was popular in the Southern and Northern Dynasties?

The most commendable thing about poetry in the Northern and Southern Dynasties is the rise of landscape poetry. Before this, the description of mountains and rivers in poetry was only a foil, but at this time some poets took mountains and rivers as aesthetic objects and incorporated them into their own poetry creation, as pointed out in Wen Xin Diao Long Ming Shi: "In the early Song Dynasty, there was a change in style. Zhuang Lao retired and the mountains and rivers were beautiful. " The most famous poets are Xie Lingyun (385 ~ 433) and Xie Yuezhao (464 ~ 499), who are called "big and small thanks" in the world. Daxie is good at changing scenery and painting. Occasionally, I can write such a natural and ingenious stroke as "Spring grass grows in the pool and willow turns into songbirds" ("Going upstairs in the pool"). Xie Yuezhao's landscape poem "Self-citation, Solitary Flow, Beautiful Scenery, Enjoy" (Selected Poems of Caijitang) is a great thank you. As its famous saying goes, "Yu Xia is scattered into Qi, and Chengjiang is as quiet as practice. Noisy birds cover Chunzhou, and miscellaneous English is full of Fangdian "("Going to Sanshan Night "); "Knowing the boat of heaven, distinguishing the river tree of clouds" (Xuancheng) has reached a high level in capturing the interest of mountains and rivers and in the coexistence of scenes.