Five Problems Needing Attention in Landscape Greening Construction Landscape engineering includes sorting out landscapes, remodeling terrain, paving roads, paving sites, building buildings, building engineering facilities, greening and planting, etc.From design to construction, it focuses on the landscape effect after completion. The overall goal is to create a good living environment for animals and plants, and create a garden-like green space for people.Nowadays, the scale of landscape engineering is becoming larger and larger. In practice, landscape engineering is often divided into several parts, which are entrusted to different units for construction. Therefore, there are often problems in connection with the project and construction cooperation. In addition, due to the special needs of some projects, plants are often planted in non-planting season.Through practice, the author puts forward the following problems that should be paid attention to in the process of garden construction for your reference. 1Preservation of original trees The original trees are determined to need preservation. Before construction, measures should be taken to temporarily enclose them in order to avoid damage caused by solid burning.In order to prevent mechanical damage to tree trunk and bark, straw bags are used for protection.Especially roadside trees, sometimes because of the replacement of pavement or tree hole boards, need to do cushion, lime and cement will cause soil alkalization, endangering the normal growth of trees.Therefore, in the construction process, the tree holes are first protected with soil and made into mounds less than 30 cm high to avoid lime intrusion.If the cushion needs to be watered and maintained, the tree caves should be enclosed in time, or water should be directed elsewhere. It is forbidden to pour water containing lime and cement into the tree caves. 2Adoption and restoration of topsoil Soil is the basis for the growth of plants and trees. Soil grains in the soil are the best aggregate structure.The diameter of aggregates suitable for plant growth ranges from 1 to 5 mm, the pore size is less than 0.01 mm, and the root hairs can not invade.Generally, topsoil has a large amount of nutrients and useful soil aggregate structure, but when remolding topography, topsoil is often stripped, which can not ensure that plants have good growth conditions. Therefore, the original topsoil should be preserved and effectively utilized during planting. In order to prevent heavy machinery from entering the field to compact the soil and to avoid the destruction of the aggregate structure, it is better to excavate the surface soil with a retrograde forklift truck and proceed in one direction.Surface soil is best laid directly on the planned planting site, not temporarily stacked to prevent consolidation of the surface.Excavation and paving of topsoil can not be carried out after rain. The ground condition during construction should be very dry and the machinery should not be repeatedly rolled.In order to avoid the formation of stagnant layer on the restored ground, tillage should be carried out during the tillage. The foundation of the restored topsoil should be tilled to a certain thickness in order to integrate with the restored topsoil.Deep tillage method is adopted to make the land wind and sunshine, so as to achieve the purpose of recovering the soft land. If the underlying soil is not good, the soil should be improved, and the depth of soil improvement should be 80-100 cm (including the surface layer). 3Arrangement of greening land Cleaning up green land is not just about cleaning up garbage and weeds.The importance of this operation lies in providing good growth conditions for plants, ensuring that the roots can fully elongate, maintain vitality, and absorb nutrients and water.Therefore, heavy machinery should not be used to roll the ground in construction. 1 The root zone layer should be beneficial to the root elongation balance.Generally speaking, the minimum survival thickness of lawn and ground cover is 15 cm, that of small shrub is 30 cm, that of big shrub is 45 cm, that of shallow root tree is 60 cm, and that of deep root tree is 90 cm. On the basis of the minimum survival thickness, the minimum survival thickness of plant cultivation increases by 15 cm for lawn cover and shrub, 30 cm for shallow root tree and 60 cm for deep root tree. 2 Ensure proper soil hardness.Proper soil hardness can ensure that the root