湖北兴山县种子植物区系研究

Floristic Characteristics of Seed Plants in Xingshan County of Hubei

根据2016—2017年对兴山县全域进行网格调查所获取的3450号标本以及19026张植物照片,并结合相关标本馆馆藏标本数据对兴山县域种子植物的物种组成及区系特征进行研究。结果显示:兴山县共有种子植物152科761属2185种,其中裸子植物6科15属20种,单子叶植物20科135属315种,双子叶植物126科611属1850,种优势科45科,表征科15科;其植物地理成分复杂,可划分为15个分布型、21个变型,其中温带分布型共有393属,占总属数的54.4%,热带分布型246属,占总属数的33.79%,具有由亚热带向温带过渡的性质;县域植物区系起源古老,并留存下大量的孑遗物种;县境内珍稀濒危植物丰富,但受威胁程度较高,亟待保护。

The floristic characteristics of seed plants in Xingshan County were studied based on the 3450 plant specimens and 19026 plant photos collected from the whole region of Xingshan County from 2016 to 2017 by the grid investigation method, and the specimen information obtained from several herbaria. The results showed that 2185 species of seed plants belonged to 761 genera and 152 families in Xingshan, including 20 species of gymnosperms belonging to 15 genera and 6 families, 315 species of monocotyledons belonging to 135 genera and 20 families,1850 species of dicotyledons belonging to 611 genera and 126 families, as well as 45 dominant families and 15 typical families. The complex floristic geographical elements were divided into 15 distribution types and 21 variations, of which there were 393 genera in temperate distribution, accounting for 54.4% of the total genera, and 246 genera in tropical distribution, accounting for 33.79%, presenting the transition nature from subtropical zone to temperate zone. The origin of flora in Xingshan was ancient and a large number of relict species were preserved. The rare and endangered plants were abundant but threatened seriously which should be protected in time.