东营市植物资源调查与区系分析

东营市自然分布的维管束植物共有87科279属501种,其中蕨类植物4科5属8种、裸子植物1科1属1种、被子植物82科265属492种;含有20种以上的大科有禾本科、菊科、豆科、莎草科和蓼科。属的地理成分可归为14个分布区类型,其中世界分布67属,而且多为典型植被草甸、沼泽和水生群落的优势种和建群种。剔出世界广布成分后,温带区系成分占63.21%,热带区系成分36.79%。就具体区系成分而言,北温带分布最多,71属占33.50%,其次是泛热带分布,50属占23.58%,再次为旧世界温带成分,31属占14.62%。东营植物区系的地带性特征不显著,植物区系虽然表现出温带特征,但东亚成分与同纬度其他地区相比偏少,中国特有成分贫乏。

Plant Resources Investigation and Floristic Analysis of Vascular Plants in Dongying

There are 501 species of 279 genera among 87 families of wild vascular plants in Dongying,including 5 genera and 8 species in 4 families of pteridophyte,1 genus and 1 species in 1 family of gymnosperms,and 265 genera and 492species in 82 families of angiosperms.Bigger familiey having more than 20 species are Poaceae,Asteracea,Fabaceae,Cyperaceae,and Polygonaceae.All the 279 genera can be divided into 14 area-types.67 genera are cosmopolitan,having many dominant species and constructive species in typical vegetation,such as meadow,swamp and aquatic communities.The genera of temperate area-types account for 63.21%,taking a predominant position,while those of tropics account for 36.79%except cosmopolitan ones.As of specific composition,the order from most to least is North Temperate type with 71 genera and accounting for 33.50%,Pan-tropical type with 50 genera and accounting for 23.58%,Old World Temperate type with 31 genera and accounting for 14.62%,and so on.The zonal characteristics of Dongying flora are not significant.Although showing temperate characteristics,the East Asian component is less than that of other regions in the same latitude,and the Chinese Endemic genera are poor.