The growth between stem segments broadcast sown and planted in the roof greening: taking a roof greening area in the core area of Beijing as an example

This trial took a roof greening area (about 300 square meters) in the core area of Beijing as the test site, and took Phedimus aizoon and Sedum sarmentosum Bunge as the sample plants, compared the growth of plants (with coverage as the index) under the two modes of planting and stem segment broadcast sowing (low, medium and high density), and calculated the cost and time cost of planting (May to September 2019). The results showed that: ① the cover degree of high-density stem segments was the highest, and plants showed strong adaptability; ② It is feasible to spread the stem segments mode; ③ High-density stem segments mode have the highest direct cost, but the greatest effect; The direct cost of low-density stem segment broadcast sowing is the lowest.