According to the investigation, your poem does not exist. I found relevant articles and found the following similar verses as a reference:
Deng Yuqiangu County
Dynasty: Tang Dynasty
Author: Liu Changqing
On the lonely city are white clouds, and west of the Chu River, which is desolate for eternity.
The official buildings are empty, the autumn grass is green, and the parapets are still singing in the night.
The Pingjiang River is so dim that visitors are far away, and the setting sun is low towards the visitors.
The sand bird does not know the changes in the mausoleum and valley, and flies to Yiyang River in the morning and evening.