Landscape engineering includes landscape management, terrain reconstruction, road construction, site paving, building, engineering facilities construction, greening and so on. From the design to the construction stage, it focuses on the landscape effect after the completion, and the overall goal is to create a good living environment for animals and plants and create a garden like green space. Now the scale of landscape engineering is becoming larger and larger. In practical operation, landscape engineering is often divided into several parts and entrusted to different units for construction. Therefore, there are often problems in project connection and construction cooperation. In addition, due to the special needs of some projects, plants are often planted in non planting seasons. Through practice, the author puts forward the following problems that should be paid attention to in the process of landscape construction, for peer reference.
1. Preservation of original trees
It is determined that the original trees need to be preserved. Before the civil construction, measures should be taken to temporarily surround them to avoid damage caused by steadiness and burning. In order to prevent mechanical damage to trunk and bark, straw bags should be used for protection. Especially for roadside trees, sometimes due to the replacement of sidewalk board or tree hole board, it is necessary to make cushion. Lime and cement will cause soil alkalization and endanger the normal growth of trees. Therefore, in the construction process, the tree hole should be protected with soil to make a mound less than 30 cm high to avoid lime invasion. If the cushion needs to be watered for maintenance, the tree hole shall be enclosed in time, or the water shall be directed elsewhere. It is forbidden to pour water containing lime and cement into the tree hole.
2. Taking and restoration of topsoil
Soil is the basis for the growth of flowers and trees, and the soil particles in the soil constitute the aggregate structure. The size of aggregates suitable for plant growth is 1 to 5 mm, and the pores less than 0.01 mm can not be invaded by root hairs. In general, the topsoil has a lot of nutrients and useful soil aggregate structure, but in the transformation of the terrain, the topsoil is often stripped, which can not ensure that plants have good growth conditions. Therefore, the original topsoil should be preserved and effectively used in planting.
In the process of taking and restoring topsoil, in order to prevent heavy machinery from entering the site to compact the soil and avoid the damage to the aggregate structure, the reverse forklift is used to dig the topsoil and carry out it in one direction. The topsoil is directly spread on the planned planting site instead of temporary stacking to prevent the surface from consolidation. Excavation and spreading of topsoil shall not be carried out after rain. The ground condition during construction shall be very dry, and repeated rolling by machinery is not allowed.
In order to avoid the formation of stagnant layer in the restored ground, it is necessary to plow it well. The foundation of topsoil restoration land should be ploughed up to a certain thickness so as to be integrated with the restoration topsoil. If the lower soil is not good, the soil should be improved, and the soil improvement depth should be 80 to 100 cm (including the surface).