The maintenance cost of the first-class green space is 2.00-8.00 yuan///m2· year.

Maintenance cost of secondary green space 1.50-2.00 yuan///m2· year.

Maintenance cost of Grade III green space 1.00 yuan///m2· year.

The maintenance cost of Grade IV green space is 0.70 yuan///m2· year.

This standard is applicable to the greening and maintenance of urban street trees, isolation belts, flower belts, flower beds (platforms), central green islands and green spaces along the street (Grade I).

1, trees thrive. According to the growth habits of plants, the trees should be pruned and reshaped reasonably, and the trees should be kept neat and beautiful, with even skeletons and basically straight trunks.

2, tree holes, flower ponds, green belts, green space along the street below the surrounding plane 5- 10 cm, no weeds, dirt, debris, no water, clean and hygienic.

3. The number of street trees is below 1%, and there are no dead trees and dead branches.

4. Trees basically have no symptoms of pests and diseases, the degree of pests and diseases is controlled below 5%, and there is no phytotoxicity.

5. No man-made damage, no graffiti, nailing, hanging and misplacing.

6. Within 5 years of planting, the newly replanted street trees are the same as the original tree species, with the same specifications and protective measures.

7. The survival rate of newly planted and replanted street trees is over 98%, and the preservation rate is over 95%.