The Ornamental Evaluation And Studies Of Cold Resistance Of Introduced Perennial Flowers In Beijing Area

The Ornamental value of 256 perennial flowers introduced by Beijing Botanical Garden are evaluated and cold resistance of 10 species are studied in this paper.Accroding to the characteristics of the Perennial flowers, 17 appraisal indexes are selcted and a multifactoririal appraisal system based on the Analytic Hierarchy Process is developed for the aim of getting the ornamental value of the Perennial flowers, and 17 appraisal indexes of the Perennial flowers are analyzed through Analytic Hierarchy Process (AHP). Accroding to the multifactoririal appraisal system , 256 Perennial flowers introduced by Beijing Botanical Garden are judged by this way and makes satisfied results, which are an important and scientific foundations for the gardens green in Beijing areas.The effect of low-temperature stress on electric conductivity,SOD and POD activity,soluble protein and free proline content show that the former three methods could reflect the cold resistance of ten perennial flowers.The electrolyte leakage rate of the cell have significant difference between ten Prennial flowers in cold tolerance , SOD and POD relative activity and soluble protein content have different change rules under different cold stress,and so it could be as index for and cold tolerance. Meanwhile,they are according with the survival rate.The result shows that there are obvious differences of resistance among ten Prennial flowers in cold tolerance: Veronica spicata'Romiley Purple'>Solidago'Goldkind'> Sedum spurium'Coccineum'>Sedum x'Matrona'>Sedum spectable'Rosenteller'> Solidago 'Golden Dwarf'>Helenium 'Copper...