Where are the most locust trees in China?

Robinia pseudoacacia, also known as Robinia pseudoacacia, was introduced to China from Qingdao, then propagated in Qilu, then spread to the north, and soon spread to the whole country. However, at present, because of its shallow root system, it is easy to lodging, so it can not be used for afforestation of barren hills and is not suitable for landscaping. Mainly used for charcoal production, as well as some wood, with the collection of locust trees and bees released, the application is not big, mostly in rural areas. It is found in most parts of the north.