The Characteristics of Spermatophytic Flora from Dapeng Peninsula,Shenzhen

Dapeng Peninsula is located in southeast of Shenzhen Special Economic Zone,Guangdong,at 22°26’ to 22°34’N and 114°28’ to 114°37’E,with a total area of 106.7 km².The highest mountain in Dapeng Peninsula is Qiniang Mountain range,with the highest peak at 867 m.Surveys on plant resources and floristic composition have been conducted since 1998,and more than 3000 specimens were collected.Up to 990 species(including intraspecific taxa) of spermatophytic plants,belonging to 158 families and 575 genera,were recorded in Dapeng Peninsula,of which 6 species,belonging to 5 families and 5 genera,are gymnosperms;984 species,belonging to 153 families and 570 genera,are angiosperms.The major vegetation types in Dapeng Peninsula are evergreen monsoon forest,south subtropical evergreen broad-leaf forest,shrub forest,shrub-grassland,grassland and beach vegetation.The charateristic families are Cyperaceae,Theaceae,Moraceae,Orchidaceae,Urticaceae,Rutaceae,Myrsinaceae,Fagaceae.The species-rich tree genera with more than 8 species are Ficus,Fimbristylis,Hedyotis,Camellia and Syzygium,and most of them are of tropical and wide distribution.According to the geographical distribution,the spermatophyte genera may be divided into 13 types and 10 subtypes,of which Pantropic and Tropical Asia are the main ones in the flora and the temperate compositions(15.63%) are relatively poor.At specific level,the Tropical Asia-compositions(28.99%) are dominant.Comparing the composition of the flora with those of 4 neighbouring regions,the flora of Dapeng Peninsula is much more closely allied to Heishiding than to the others with the indices of genera similarity and species similarity 63.57% and 41.49% respectively.As a part of Guangdong flora,the flora of Dapeng Peninsula shares the same origin with South China.