Based on the principal component analysis and the cluster analysis of phenological observation data from 70 meteorological observation stations for 8 years (1994--2002), which were located in all the distribution regions of Melia azedarach in China, the distribution regions of Melia azedarach in Chinese were divided into 11 phenological areas. It will provide a scientific basis for seedling rational allocation and germplasm resources conversation for Melia azedarach; and the phonological isophene map will be a guidance for agriculture and forestry production in the most parts of southern China.
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