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With the development of the city, urban land is increasingly tense, dwindling green area, green roofs have become one of the effective ways to increase urban green area, plant selection to establish a scientific system is a comprehensive implementation of the green roof top priority, current green roof The plant sample survey, and part of the plant stress resistance. The survey results show that Beijing's green roof using a total of about 100 species of plants, involving 43 families, about 80 genera. Which trees accounted for 24%, 36%, shrubs, vines 7%, accounts for 30% of the herbal. Bushes and trees than 1: 1.5, a smaller proportion of tree species, shrubs and herbaceous plants relatively large proportion the roof load line with the requirements of the plant; addition, a comprehensive evaluation of plant growth. Sedum (Sedum linear Thunb), of sarmentosum (S. sarmentosum Bunge) 'Carmine' Sedum (S.spurium 'Coccineum') the Babao the sedum (S.spectabile Boreau), inflection King days (S. reflexum Tripmadam), the hexagonal the Crassulaceae (S. sexangulare L.) survey, the fee increases the dish (S.kamtschaticum Fisch), Limonium grass (Limonium bicolor (Bge.) o.Ktze), Viola yedoensis Makino (Viola philippica Car.), pointed leaves carnation (Dianthus spiculifolius Schur) more than 10 species of plants under different stress environmental conditions leaf relative water content, cell membrane permeability, MDA content, SOD activity indicators were measured to determine its drought, high temperature, low temperature adaptability. With the SOD activity increased drought stress time, Sedum plant leaf relative conductivity increased in varying degrees, sigmoidal Sedum rose by a big margin, obvious rise of pointed leaves carnation; sedum The upward trend is the first increase after lowering the basic state of affairs. Plant drought resistance in order from strong to weak order 'bright' Sedum gt; 'Carmine' Sedum gt; Kamchatka fees dishes gt; the sedum gt; anti song Sedum gt; sarmentosum gt; Babao Sedum gt; hexagonal Sedum gt; pointed leaves carnation gt; Limonium gt; Viola Philippica Cav. Semi-lethal high temperature by measuring the plant, roughly determine plant heat-resistant strength order: sigmoidal Sedum gt; Sedum gt; Viola Philippica Cav gt; pointed leaves carnation gt; sarmentosum gt; 'bright' Sedum gt; Kamchatka fees dishes gt; 'Carmine' Sedum gt; the Limonium gt; hexagonal Sedum gt; the Babao Sedum. Sigmoidal Sedum highest lethal temperature of 65.97 ℃, the Babao Sedum as low as 48.94. Under low temperature stress, 'bright' Sedum 'Carmine' Sedum survey and fee increases food cold tolerance than Sedum hexagonal Sedum, pointed leaves carnation is better than Limonium, Viola . In addition, through a comprehensive survey testing ground plant, the results show that the part of Sedum plants and sharp leaves carnation plants basically suitable for the green roof in the Beijing area, and provides a theoretical and practical basis for plant selection and application.
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