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四川木本种子植物科属分布区类型统计分析

Statistical Analysis On Areal Type Of Family And Genus Of Woody Spermatophyte in Sichuan Region, China

  • 摘要: 四川是种子植物多样性极为丰富的地区。据实地和查阅文献,四川有野生木本种子植物3931种,归入515属128科。以我国植物区系理论研究成果为工具,对四川的木本种子植物科和属的分布区类型进行统计分析。结果表明,所有的科划为10个分布区类型和11个变型,其中热带科占61.3%,温带科占37.7%,中国特有1科,以热带科占绝对优势,与热带非洲、热带美洲、热带亚洲均有广泛联系;温带科以北半球温带成分为主。所有的属,划分为15个分布型和18个变型,热带属占50.91%,温带属占41.03%,说明四川是热带和温带植物区系的交汇地区,热带属略占优势。在种的水平上,热带种占38.15%,温带种占60.2%,明显以温带成分为主,所以木本植物区系的基本性质是亚热带性质,即从热带向温带过渡。东亚分布型的科、属、种的比例也较高。文章将四川木本种子植物区系组成、分布区类型、中国特有分类群与历史文献进行了对比分析,对发生的变化进行了讨论,对木本种子植物区系的后续研究方向和重点进行了展望。

     

    Abstract: Sichuan is an area of exceptional richness in spermatophyte diversity. According to field investigations and literature reviews, there are 3931 species of wild woody spermatophyte in Sichuan Region, belonging to 128 families and 515 genera. Based on the theoretical research results of China's flora, a statistical analysis was conducted on the areal types of families and genera of woody spermatophyte. The results show that all families were classified into 10 areal types and 11 subtypes, among which tropical families accounted for 61.3%, temperate families 37.7%, and there was 1 family endemic to China. Tropical families held an absolute advantage and had extensive connections with tropical Africa, tropical America, and tropical Asia; temperate families were mainly composed of components from the temperate zone of the Northern Hemisphere. All genera were classified into 15 areal types and 18 subtypes, with tropical genera accounting for 50.91% and temperate genera 41.03%, indicating that Sichuan Region is an intersection area of tropical and temperate flora, with tropical genera being dominant. Among all species, tropical species accounted for38.15% and temperate species60.2%, with temperate species being the majority. Consequently, the fundamental nature of the woody spermatophyte flora in Sichuan is subtropical, representing a transition from tropical to temperate zones. The proportion of families, genera, and species with East Asian distribution types was also relatively high. This paper conducts a comparative analysis of the composition, areal types of floristic regions, and endemic Chinese taxa of Sichuan's woody spermatophyte against historical literature, discusses the ensuing changes, and provides perspectives on future research directions and priorities for the study of this flora.

     

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