Quantitative analyses on the moss flora of China based on 125 geographical units
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摘要: 系统收集了我国125个地区的藓类植物区系资料，统计了种和属在这些地区的分布频度。以藓类种数超过100的73个地区为研究对象，以科所含的种数为指标，应用除趋势对应分析和模糊均值聚类基础上的主坐标排序，对我国藓类植物区系的区域分化特点进行了定量分析。结果显示，随着分布频度增加，种和属数均呈指数式下降，绝大部分的种和属仅在极少数地区有记录。根据藓类植物的区系组成，73个地区可分成5组：第1组涉及华东、华中和西南的12个地区；第2组包括西北、华北为主的16个地区；第3组为人为干扰强烈的长三角等15个地区；第4组包括以华南为主的热带、南亚热带区域的19个山地；第5组包括西北、东北和西南的11个温带或高海拔山地。研究结果表明我国藓类区系报道在种类鉴定中可能存在比较普遍的误定现象，从而造成绝大部分种类局限于狭窄地理区域的假象。Abstract: Floristic data of mosses from 125 geographical units in China were collected from relevant literature. The distribution frequencies of genera and species were calculated. Geographical differentiation of moss flora was analyzed by Fuzzy K-means Clustering and Detrended Correspondence Analysis. Results showed that: (1) Species (or genera) number decreased exponentially with the increase in distribution frequency, namely, most species or genera were recorded from a narrow geographical range. (2) Seventy-three areas with more than 100 moss species could be divided into five groups based on the number of species in the families; group 1 included 12 areas in eastern and southwestern China; group 2 included 16 areas in northwestern and northern China; group 3 included 15 areas in the Yangtze River Delta and other areas intensely disturbed by human activities; group 4 included 19 mountains in tropical and southern subtropical regions of southern China; group 5 included 11 temperate mountains in northeastern and northwestern China or mountains with high altitude in southwestern China. (3) Incorrect specimen identification in previous reports has resulted in the misconception that most moss species are confined to narrow geographical areas.
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Keywords:
- Mosses /
- Floristic analysis /
- Geographical distribution
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