杭州西溪湿地种子植物区系研究

Study on the Seed Plants Flora from Hangzhou Xixi Wetland,China

在野外调查、标本检视和资料整理基础上,报道杭州西溪湿地种子植物(含栽培种)136科457属739种,其中,裸子植物6科14属17种(栽培);野生被子植物中,有双子叶植物78科212属338种、单子叶植物18科76属110种。被子植物各科含属数差异显著,含1属的科占优势,共54个,占总科数的56.25%。禾本科、菊科、豆科、唇形科等?5属的科有14个,占总科数的14.58%;属数161个,占总属数的55.90%。西溪湿地植物区系成分较复杂,种子植物属的分布区类型可以分为12种,以热带性成分略占优势,共114属,占总属数的51.35%,其中以泛热带成分最多,有71属,占31.98%,反映了本区系的热带性质及其所起的的重要作用。温带地理成分含108属,占总属数的48.65%,其中以北温带所含属数最多,有65属112种,分别占总属种的29.28%、31.91%;其次为东亚分布及其变型,有19属,占8.56%,这两者是构成温带地理成分的主体。世界分布有66属,地中海区—西亚—中亚分布的属和中亚分布的属本区未见,中国特有成分缺乏。

According to field investigation and speciesmens checking,a total of 739 species（including cultivated species） which belong to 457 genera and 136 families were reported from Xixi wetland of Hangzhou,Zhejiang province.Among all the species,there were 17 species（cultivated）,14 genera and 6 families of gymnosperm.There were 338 species of dicotyledon in 212 genera 78 families and 110 species of monocotyledon in 76 genera 18 families in all the wild angiosperm in Xixi wetland.Also there was a significant difference in the amount of genera in different families.54 families（56.25%） consisted of only 1 genus,14 families（14.58%） such as Gramineae,Compositae,Leguminosae and Labiatae consisted of more than 5 genera and their total number of genera was 161,which account for 55.90% of all genera.The floristic element in Xixi wetland was relatively complicated.Of all the 12 genus areal types,tropical geographical elements take up 51.35% with 114 genera and the pantropic type consisted of the largest amount of genera,which is 71,31.98% of all genera,thus indicating the tropical characteristics and important function of this flora.The temperate elements consisted of 108 genera（48.65%）.The north temperate type occupied the majority part with 65 genera（29.28%） and 112 species（31.91%）,the east Asia type and its variant took the second place with 19 genera（8.56%）,and these two types were the main the geographical elements of temperate.Meanwhile,66 genera were listed as cosmopolitan type and there was no genus divided into the Mediterranean,W.Asia to C.Asia type,Center Asia type and Chinese endemic element be found in the seed plants flora of this area.