也论"田中线"及其生物地理意义

利用大尺度的植物区系分布信息,通过统计检验,验证了田中线存在的真实性及其新的生物地理意义。结果表明:田中线对中国-日本植物区系分布类型、东亚植物区系分布区类型和热带亚洲区系分布类型在云南的分布均具有严格的限制意义,但对中国-喜马拉雅植物区系分布类型的分布缺乏严格的限制;同时,我们首次发现该生物地理对角线可能对中国特有属在云南的分布具有显著的限制作用;本研究不能证明田中线对云南地区种子植物区系成分的地理分布具有全局性的限制意义,有关田中线的真实性及其生物地理意义的研究有待进一步深入。

Tanaka Line and its bio-geographical significance:A further discussion

Based on the information about the distribution of seed plant flora in large scale,and through statistical analysis.the reality of Tanaka Line's existence and its bio-geographical significance were examined.The Tanaka Line had significance in the strict limitation on the geographical distribution of Sino-Japan flora,East Asia flora,and Tropical Asia flora in Yunnan,but less significance on the distribution of Sino-Himalayan flora.The authors first found that the distribution of China's endemic flora in Yunnan was possibly limited by the Tanaka Line.It was observed that the Tanaka Line did not shape the overall spatial patterns of seed plant flora in Yunnan.The Tanaka Line and its bio-geographical significance needed further exploration.