Study on the distribution and the population expansion of Ailanthus altissima, an alien tree species, in Japan.

阐明了外来树种臭椿在日本的分布和种群扩展情况。本种在日本47个都道府县均有分布，在山梨县甲府盆地占每平方公里900目的29.8%。主要是两个遗传上不同的谱系被建议引入到每个种植区，在日本。甲府盆地的小种群之间存在遗传分化，说明甲府盆地各种群的创始者是少数个体。在山口县蜀南市，该树种在50 m以内通过根吸盘进行无性繁殖。

The distribution and the population expansion of Ailanthus altissima, an alien tree species, in Japan were clarified. This species is distributed all 47 prefectures in Japan and 29.8% of 900 meshes of one square km in Kofu basin, Yamanashi Pref. Its growing location was defined by land utilization. Mainly two genetically different lineages were suggested to be introduced to each growing area, in Japan. The little populations in Kofu basin were genetically differentiated from each other and it suggests that small number of individuals were founder of each population in Kofu basin. In Shunan-city, Yamaguchi Pref, this tree species clonally propagated less than 50 m by root sucker.