The urbanization process has made the area of ​​urban greening available to decrease, and roof greening has become one of the important ways to open up new urban green space and improve urban environment. As an important part of the urban green space system, the roof garden plays an important role in maintaining a virtuous circle of urban ecosystems and creating a pleasant living environment. Let's take a look at how to design a roof garden plant .
Roof garden plant features:
At present, the construction of roof gardens is being valued by governments at all levels, and urban roof gardens are developing rapidly. However, there are still many problems in the rapid development of the roof garden. The main manifestations in the construction technology and management methods need to be further improved and improved. Among them, the plant landscape, which is an important part of the roof garden, is lack of research. Due to the special environmental conditions and engineering limitations of the roof garden, the plant configuration shows different characteristics from the ground garden plants. It is necessary to study the plant selection and configuration of the roof garden.
The ecological conditions of the roof garden are rather harsh: sunshine, temperature, wind, etc. are different from the ground and change with the increase of the layer height. The light intensity of the roof is larger than that of the ground, and the illumination time is longer. For example, the winter light intensity of the roof is larger than that of the ground. The strong sunlight in the summer makes the roof temperature higher than the ground during the summer and lower than the ground at night. It is very unfavorable for plant growth, with high roof topography, high wind speed, strong transpiration of plants, rapid evaporation of soil moisture, and easy to be blown down by strong winds. In addition, some roof gardens are located at the top of the podium. Due to the fact that some parts of the tower block the sun may be difficult to see, it is sheltered for a long time. It can be seen that the ecological conditions of the roof garden are quite complicated, and it is necessary to select suitable plants according to local conditions.
Due to the limitation of building load, the planting soil of the roof garden is relatively thin, and the thickness of the soil layer in most places is controlled within the range of 10cm - 60cm. Only a few special places can reach a thickness of more than 60cm, resulting in soil water capacity. Small, the soil is easy to dry. Moreover, the planting soil of the roof garden is completely isolated from the earth, and it cannot absorb the water in the deep underground soil by capillary action like the surface soil. Once the irrigation is not given in time or the water is replenished by natural precipitation, the soil is easily in a water shortage state. In addition, in order to prevent damage to the building roof structure caused by long-term osmosis, the roof garden should avoid the use of plants that secrete acidic substances at the roots.
The roof garden is the application of plant landscaping, that is, the application of trees, shrubs, vines and herbaceous plants to create landscapes, giving full play to the natural beauty of the plants themselves, lines, colors and other natural beauty to form a beautiful and moving picture for people to watch.
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