Always, tree hedgerows can be seen as corridor, for their ecological function to provide habitats for birds and other animals. Ridges of field, often narrower than 2m, used as roads for farmers to manage fields.Sometimes, some crops different from fields are planted in the ridges. These ridges have some functions, such as separating different pieces of fields, blocking water flows, marginal effects and so on.Sometimes, different crops are planted on both sides of ridges.