Study on Adaptability of Five Species of Colored-leaf Trees Introduced in Yangma of Chongzhou

To enrich the species resources of colored-leaf trees in Chengdu region,5 colored-leaf tree species,Acer rubrum,Liquidambar styraciflua,Malus ‘Royalty’,Prunus × cistena,Cercis canadensis ‘ForestPansy’,were introduced to Yangma of Chongzhou in 2009.The survival rate,growth potential and increment,phenophase,ornamental characteristics,disease and pests were studied.The results showed that the survival rate of five species was 80 % ～ 100 %,average annual growths of ground diameter,tree height and crown width were 0.4 ～ 0.9 cm,32 ～ 83 cm and 15 ～ 76 cm respectively,the best ornamental periods of colorful leaves were 49 ～ 150 days,the periods with colorful leaves and with leaves were 90 ～ 282 and 258 ～ 303 days respectively,the rate of diseases and pests was 9 % ～ 95 %.Among of them,four trees species,A.rubrum,L.styraciflua,M.spectabilis and C.Canadensis ‘ForestPansy’,performed well and were suitable to be planted in Yangma town of Chongzhou.