【摘要】 对陕西境内木本种子植物区系属一级的热带地理成分进行了研究,全省木本种子植物区系中的热带地理成分共包括泛热带成分、热带亚洲和热带美洲间断成分、旧世界热带成分、热带亚洲至热带大洋洲成分、热带亚洲至热带非洲成分及热带亚洲成分6种类型,共95属,归属于53科。在各种热带地理成分中,陕西木本植物区系与泛热带成分联系最为密切,各类热带地理成分主要分布于陕西秦岭以南地区。从科、属、种的分布区格局以及木本热带区系成分的群落学作用等方面分析,陕西植物区系具有明显的温带性质,同时,区系也呈现一定的热带—温带过渡性特点。更多还原

【Abstract】 The tropical geographical elements of woody seed plant in Shaanxi province were investigated and were found to belong to six categories,which included Pantropic,tropical America and Tropical Asia disjuncted,Old World tropics,Tropical Asia to Tropical Australasia,Tropical Asia to Tropical Africa,and Tropical Asia (Indo-Malesia).The dominant element of the tropical geographical composition was the Pantropic and there are 37 genera and 197 species in Shaanxi province.The distributions of the elements were mainly in the southem region of the Qinling Mountains. The nature of Shaanxi woody flora was determined to be temperate based on areal-type of family,genus and species and the phytocoenology function of the woody tropical geographical elements.The Floristic transition from tropical to temperate in Shaanxi was very obvious.更多还原