THE PLANTING DESIGN AND DIVERSITY IN DIFFERENT BIOLOGICAL DETENTION FACILITY IN SEMI-ARID GREEN SPACE WITH THE LOW IMPACT IMPROVEMENT

摘要

The northwestern Chinese ecological environment of the semi-arid field is fragile and susceptible to temperature variability. Xixian New Area is the first batch of low impact improvement construction in the northwest semi-arid region, and its greening construction has typical representativeness. As a common ecological facility in the construction of low impact improvement, bioretention facilities have always been a hot research field. With reference to the natural vegetation prototypes in the northwest, the plant landscape can be achieved with drought-resistant water and long-term stability by constructing the ground cover plant community. Based on the investigation and division of types of bioretention facilities, the research proposed the design strategy of the vegetative planting of the bioretention facilities in the semi-arid and semi-humid region of northwest China. The research summarized the resistance of 50 ground cover plants to sorghum, pollution and drought tolerance, and divided them into different levels. Taking the three practice projects of bioretention facilities as the example, the recommendations and models for optimization of shrub and groundcover plant selection and planting design were summarized, providing theoretical basis for the construction of low impact improvement urban green space and ecosystem improvement. The key parameters of the plant cover community design of biological detention facilities and the combinations of four dominant types of plant cover communities were extracted.