中国蓼族植物(蓼科)的地理分布

The Geographic Distribution of the Tribe Polygoneae(Polygonaceae) in China

通过多年野外实地考察和资料统计分析,对蓼族植物在中国的地理分布进行了深入研究。结果表明,该类群在中国的分布具有一定规律。在水平分布上,物种数目由东北到西南呈逐渐增加的趋势,有6个高密度的分布区,集中沿横断山脉—秦巴山脉分布。除首乌属全国广泛分布外,其他各属或组均有其主要的分布区域。在垂直分布上,整个蓼族植物几乎都分布在海拔5 000 m以下。在海拔1 000～3 000 m,蓼族植物广泛分布,冰岛蓼属、拳参组、头状蓼组一年生型和神血宁组植物主要分布在海拔3 000 m以上,萹蓄组、春蓼组、刺蓼组、首乌属、虎杖属、金线草属和荞麦属主要分布在海拔1 000 m以下。

The geographic distribution of the tribe Polygoneae in China was studied based on our field investigation of years and statistical analysis.The result shows that their distribution in China has a certain regularity：the number of species in different regions appears an increasing trend from northeast to southwest in the horizontal distribution.There are six high-density areas,concentrating on the range of Hengduan-Qinba Mountains.The other genera or sections have their concentrated distribution except Fallopia,which widely distributed in the whole country.In the vertical distribution,almost all of the Polygoneae located below the altitude of 5 000 meters.The whole Polygoneae widely distributes at an altitude of 1 000～3 000 meters.Koenigia,Polygonum sect.Bistorta,sect.Aconogonon and annual plants of sect.Cephalophilon mainly distributed above 3 000 meters,sect.Polygonum,sect.Persicria,sect.Echinocaulon,Fallopia,Reynoutria,Antenoron and Fagopyrum mainly distributed below 1 000 meters.