Study on Screening of Outstanding Ornamental Trees in Xinyang

Xinyang city is located in the subtropical zone to warm temperate transition area and the plants resources are very abundant.With the development of city garden,the demands for excellent ornamental tree species are increasingly in this city.Aiming at urgently needed ornamental tree types for urban greening in Xinyang,studies of preliminary screening were carried out according to the ornamental tree species which had been chosen during the early period of general survey and 20 ornamental tree species were screened.The evaluation system about the ornamental trees was successful constructed based on their indexes in landscaping values,according to the method of Analytical Hierarchy Process(AHP).The 20 ornamental tree species were evaluated by this system and 7of them were suggested to be generalized and 5to be applied appropriately in urban greening.