Sedum soilless is cultivated and grown on a special substrate. The so-called special substrate is made of industrial waste through high-temperature sterilization and disinfection, and it is a very environmentally friendly product. Using it to plant pure soilless lawn carpet fully embodies the recycling of waste, has the characteristics of circular economy and environmental protection significance, benefits the country and the people, and has strong vitality.
At present, the planting technology of roof greening soilless lawn at home and abroad can be divided into the following categories:
1. soilless lawn roll: rice husk, sawdust and broken straw are laid on non-woven fabrics as substrates, and grass is planted on these substrates. The lawn planted is usually called soilless lawn roll. This kind of soilless lawn roll is generally suitable for ground greening and other projects, and its biggest advantage is its lower price. However, they are not suitable for roof greening, because they are easy to decompose, the matrix is easy to cause new pollution to the roof, and the roof will become a garbage dump, which will bring a lot of trouble to the owners, and the service life of such roof greening projects will not be long. Most soilless lawn rolls in China are of this type.
2. Lightweight soilless material: Lightweight soilless nutrient matrix is generally made of organic fertilizer and peat soil formed by crushing and fermenting municipal garbage, light perlite, emerald, etc. And pastoral soil. At present, a considerable part of the nutrient substrates used in roof greening projects are of this type. Some are laid directly on the roof and then planted with Sedum sarmentosum seedlings. Others use plastic boxes, pots, boxes and other utensils to plant nutrient substrates and transport them to the roof. All these methods are similar to planting plants on the roof with soil, but the producers collectively refer to it as soilless culture.
3. Soilless lawn: Soilless Sedum used by Beijing Zhumengyuan Roof Soilless Greening Technology Co., Ltd. is cultivated and grown on a special substrate. The so-called special substrate is made of industrial waste through high-temperature sterilization and disinfection, and it is a very environmentally friendly product. Using it to plant Sedum sarmentosum fully embodies the recycling of waste, has the characteristics of circular economy and environmental protection significance, benefits the country and the people, and has strong vitality.
Sedum sarmentosum has many advantages in roof greening, which has been widely recognized by people in the industry and has been widely used in roof greening projects in cities all over the world. However, for various reasons, Sedum sarmentosum is planted with soil no matter what methods are used in the greening project of Sedum sarmentosum (such as using plastic boxes, potted boxes, planting modules or planting directly on the roof). But in fact, planting Sedum sarmentosum on the roof is not a good method, because the Sedum sarmentosum will not grow well if the soil layer is thin, and some problems will occur. The thickness of soil layer will increase the bearing capacity of the roof, which will have an impact on the safety and life of the roof. In order to improve the survival rate of Sedum sarmentosum, fluffy substances need to be added to the soil when planting Sedum sarmentosum on the roof. Due to the rainy and humid conditions, this practice is not too serious in the south of China, but it will be very serious in big cities like Beijing and Tianjin in the north. Most plants in northern China will not turn green until April, and planting Sedum sarmentosum on the roof is no exception, but at this time, after severe freezing in winter, the whole weather is dry and windy. The planting characteristics of Sedum sarmentosum are that it is not suitable for watering after freezing in winter. The root system of Sedum sarmentosum is very short, and the light soil is too loose after spring, so Sedum sarmentosum and soil are easily blown away by the wind. If the treatment is not good, the greening rate will be very low, and the grass on the roof will become a new pollution source in the city. Some roof greening projects in Beijing, due to out of control, failed to keep up with the winter water and the green water, and the green rate in spring was only 10%. In other places, there is almost no pastoral soil in the matrix, which is too loose to withstand the wind blowing in March and April in the north, resulting in a large number of dead seedlings blowing away almost all the soil planted on the roof, which destroys the good air quality of the city, has a very bad impact on the surrounding environment, and also gives the roof greening work.
Planting Sedum with soil on the roof may block the sewer when the rainy season comes.
Roof greening should consider leakage, such as roof leakage. The fatal difficulty of roof greening with soil to prevent leakage is that the roof is covered with soil and green plants. If it leaks, it is difficult to find out where the leak is and it is difficult to cure it. If the roof needs to be repaired, it will be a very troublesome thing. If so much soil is moved there, the grass planted will be greatly affected. What a headache this is.
There are many hidden dangers in greening the roof with indigenous methods. Some projects can not only protect the environment and beautify life, but also bring more negative effects and troubles to people.
In order to solve the above headaches, these headaches can be solved if the soilless lawn is used for roof greening. Because there is no soil on the lawn without soil, there is no need to worry about wind pollution in March and April in the north.
When the roof needs to be repaired, it becomes easy to green the roof with soilless lawn. As long as the lawn carpet is rolled up, it is easy to find the leaking place. After the lawn was repaired, there was no damage to the lawn carpet. As before, the whole maintenance work becomes faster and easier.
Using soilless vanilla lawn for roof greening, when filled with water, it is only about 30 kilograms per square meter, which is much lighter for light roofs and will not have any impact on roof safety and life.
In recent years, all units have made a lot of efforts in roof greening, except planting with light soil.