What are the characteristics of the scenery description in the second part of Du Fu's Northern Expedition?

The second part of Du Fu's Northern Expedition describes the scenery in detail to express his feelings. The four sentences of "decadence" outline the war picture in which people are in poverty and everything is depressed. This is written from the whole and summarized from the big aspect. The sentence "looking back", with the word "Fengxiang", paves the way for turning into scenery description. Qian Deng describes the scenery along the way below. Cold Mountain, Cangya, Qiuju, Qingyun, Mountain Fruit, etc. Rendering natural beauty leads to the fantasy of "thinking in the peach garden" to strengthen the grief and indignation of "sighing is not as good as". This is a touching scene, from mountain fruit to rain and dew, "ups and downs together" is not as good as vegetation, so as to vent the poet's grief and indignation. Write down the scenery along the way. "Broken Tuo" is written under the scenery of Zhangzhou. It says "Looking Back at Fengxiang County" in front, far from the monarch, but it says "Looking Back"; It is said here that "Potuo looks at the corner" and the realm is in sight. It's close to home, but it's far away; It can be seen that the pen gesture is changeable, the former expresses loyalty to the monarch and love for the Lord from far and near; Although the latter is close to reality, it shows his homesickness and complex psychology of caring for his loved ones. The sentence "I do" is in sharp contrast, saying "already" and "still" means that I am impatient and anxious, and my servant is generous and slow, which sets off the poet's eagerness. Owl is about the broken scene you saw when you were near your hometown. Owl, Wild Mouse, Leng Yue and Bones are all rough sketches of the tragic scenes after the war. The middle phrase "going to the battlefield at night" adds to the atmosphere and shows the poet's hardships day and night. "Tongguan Million Teachers" ends with the immediate scene, exploring the evil root of the tragic scene from the immediate scene, and turning from scene description to state affairs. When asked, "Who died in the past?" , sharp and sharp. The ruin of the country was caused by the incompetence of the imperial court and the fall of Tongguan. The sentences in Sui Ling relay the innocent suffering of the people from the broken state with causal affirmative sentences, and angrily expose the fatuity and decay of the ruling group. Sui Ling and Wei strengthened the poet's strong resentment in a very positive tone. This passage is lyrical and touching, which conveys the change of the poet's mood in the description of the change of scenery and expresses the poet's deep concern for the country and the people.