Phytogeography of pteridophytes on limestone areas in Guangdong, China

2018-11-23 本站

题目:Phytogeography of pteridophytes on limestone areas in Guangdong, China



单位:1.Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.

2. Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Guangxi Teachers Education University), Ministry of Education, Nanning, China.

3. College of Horticulture and Landscape Architecture, Hainan University, Haikou 570228, Hainan.

4. Guangdong Academy of Forestry, Guangzhou 510520, China.

5. Department of Biological Sciences, Florida International University, Miami, FL 33199, U.S.A.

摘要:Guangdong Province, located in southern China, is of great interest in studies of plant geography and conservation in limestone areas because of its rich biodiversity. We: (1) performed a phytogeographical analysis of pteridophytes in the limestone areas in Guangdong, (2) evaluated and determined levels of endemism, and (3) identified affinities with the floras of neighboring limestone areas. We found that some families show a preference for limestone habitats, e.g., Hypodematiaceae, Lygodiaceae, and Adiantaceae, are typical elements among pteridophytes in the limestone regions of Guangdong. In addition, some genera or section, such as Hypodematium, and Polystichum sect. Cyrtogonellum, show an exclusive preference for limestone habitats. The predominant phytogeographical affinities identified were East Asia, Chinese endemic, and Tropical Asia. We concluded that: (1) the limestone fern flora of Guangdong is principally subtropical in nature and represents southern subtropical flora at the margins of the northern tropics, with a strong interaction with the East Asian flora, (2) the limestone fern flora of Guangdong has a phytogeographical affinity with Japan, though the floras of neighboring Guangxi and Hainan Provinces have higher similarity with it.

关键词:ferns, floristics, Guangdong Province, Karst, phytogeography, Pteridophytes