山东省蕨类植物的区系分析

对山东省蕨类植物区系成分、地理分布和生态特点进行了初步研究，并与辽宁、日本等６个地区进行了比较。结果表明，山东省蕨类植物区系具有以下几个特点：１．区系成分不算丰富，但地理成分多样，以温带成分占优势，也残存有较多的热带成分；２．种系分化强烈，特有现象明显，特有种占１１．３％；３．地理分布极不均匀，并存在明显的地带性差异，表现为由南向北、由东向西种类减少；４．与辽宁、北京、河南关系密切，与秦岭、日本也

A FLORISTIC STUDY ON THE PTERIDOPHYTE IN SHANDONG PROVINCE OF CHINA

This paper deals with the floristic components,geographical distribution and ecological environments of the Pteridophyte in Shandong. The floristic relationships between Shandong and some other regions are also disscussed. The results show that: 1. The floristic elements are relatively not rich, however, the geographical elements are varied. All the 40 genera can be classified into 10 areal-types, mainly composed of the North Temperate(30.0%), the Pantropical(22.55%), and the Cosmopolitan(20.0%).The areal-types of temperate account for 42.5%, taking a predominant position, while those of tropic account for 37.5%. 2. Endemism is remarkable, 12 species of Pteridophyte, which make up 11.3% of the total numbers, are endemic to this province. 3. The geographical distribution is fairly uneven, The number of species are decreased from South to North and from East to West. 4. The similar quotents of Pteridophyte flora between Shandong and Liaoning, Beijing, Henan, Qinling, Japan, Hainan, Xizang are 46.4%, 45.3% , 41.2%, 26.0%, 24.8%,4.7%, 3.8% respectively in sequence order. This means that this flora is most similar to Liaoning, and then to Beijing and Henan.