作 者 ：王一峰;王俊龙
期 刊 ：植物研究 2006年 26卷 6期 页码：742-749
Keywords:Gansu, chenopodiaceae, floristic characteristic, floristic division, origin,
摘 要 ：根据对藜科植物标本的收集、整理和系统鉴定,本地区藜科植物共有67种，隶属于21属，8族，在我省有2个分布丰富区：河西走廊地区和青藏高原东缘的甘南地区。分析表明，本区藜科植物可划为5个分布型和3个变型，其中以地中海区、西亚和中亚分布最多（占33.4％），除世界分布和中国特有外，均为温带性地理成分（占71％），结合对孑遗属的分析，说明了本区系的主要特征为典型的温带性质和具有一定的古老性，并与相邻地区有一定的联系；本区系起源于白垩纪至第三纪的古地中海沿岸，伴随着青藏高原的隆起、海浸海退以及气候的变迁形成了现今的区系成分。根据植物区系分区的原则和方法，将甘肃藜科植物区系划分为5个区系小区：走廊小区，祁连山小区，中部小区，甘南小区和陇南小区，其中走廊小区和甘南小区不仅是本区藜科植物主要的分布区，而且也是我省重要的农业区和畜牧业基地，因此，对各小区的区系特征进行了论述并提出了相应的生产实践的建议，以期为我省的防风固沙、植被恢复和草场建设等提供理论依据。
Abstract:Based on the collection and identification of the specimens of the Chenopodiaceae, there are 67 species that belong to 8 tribe and 21 genera in this region. The abundant distributions areas are Hexi Zoulang and South Gansu(east edge of Qinghai-Tibet Plateau).The results of floristic analysis indicate that on the level of genera, except for the Cosmopolitan elements and the endemic elements of China, all the distribution types are temperate elements which has a percentage of 71% in total genera, especially dominated with the type of Mediterranea, W.Asia to C. Asia. It shows that the Temperate Zone is the decisive factor of the floristic characteristics. According to the analysis of relic species, the floristic origin is ancient. Comparing with the species between Gansu and neighboring provinces, the flora is widely related to Ningxia, Neimenggu and Qinhai. The analysis of floristic formation shows that the place of origin of the Chenopodiaceae is Eurasia. During the Cretaceous Period, the time of origin of the Chenopodiaceae, most places of the continent of Eurasia were occupied by the ancient precursor to the Tethys Sea, therefore, primitive Chenopodiaceae likely originated on the beaches of the Tethys Sea which had an arid climate. With the development of the orogeny of Himalayas Mountains beginning from lateTertiary Period and the west Central Asia became continent, the environment became arid and some place desertification, forming the main characteristics and distribution patterns of the flora now. Finally, based on the study of the flora and the principles of the floristic division, the flora of the Chenopodiaceae in Gansu was divided into 5 floristic subregions: subregion of Qilianshan, subregion of Zhongbu, subregion of Gannan, subregion of Longnan. The floristic features of each subregions and suggestions were discussed in detail，especially subregion of Zoulang 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.