甘肃药用蒿属植物区系地理研究

Floristic study on the genus Artemisia in Gansu Province

根据对蒿属植物野外调查及标本的收集、整理和系统鉴定,甘肃蒿属植物共有73种、5变种,隶属于2亚属,在甘肃省内有陇南地区和河西走廊地区2个分布丰富区。分析表明,蒿属植物可分为7个分布型和4个变型,其中以中国分布最多(占25.6%),除世界分布和中国特有外,均为温带性地理成分,说明本区系的主要特征为典型的温带性质。根据植物区系分区的原则和方法,将甘肃蒿属植物区系划分为走廊小区、祁连山小区、中部小区、甘南小区和陇南小区,其中走廊小区和陇南小区不仅是本区藜科植物主要分布区,也是甘肃省重要的农业区和畜牧业基地。笔者等对各小区的区系特征进行了论述,并提出相应的生产实践建议,以期为甘肃省防风固沙、植被恢复和草场建设等提供理论依据。

Based on the collection and identification of the specimens of Artemisia,there are 73 species and 5 variety that belong to 2 subgenus in Gansu Province.The abundant distribution areas are South Gansu and Hexi Corridor.The results of floristic analysis indicate that on the level of subgenus,except for the Cosmopolitan elements and the endemic elements of China,all the distribution types are temperate elements.It shows that the Temperate Zone is the decisive factor of the floristic characteristics.Finally,based on the study of the flora and the principles of the floristic division,the flora of Artemisia in Gansu was divided into 5 floristic subregions：subregion of Corridor,subregion of Qilian Mountain,subregion of Zhongbu,subregion of Gannan and subregion of Longnan.The floristic features of each subregions and suggestions were discussed in detail,especially subregion of Corridor and subregion of Gannan,which are the main agricultural region and grassland stockbreeding area.And it has theoretical and practical significance to the reconstruction of pasture,vegetation restoration and the control of desertification.