河南种子植物区系地理研究

河南省地处中原 ,属于我国南北过渡和东西过渡的重要区域 ,植物区系成分复杂多样并于周围地区联系广泛 ,对其植物区系研究对深入认识本省的自然环境特征及其在我国多种自然区划中的位置等有着重要意义。该文在最新资料的基础上 ,运用区系学原理对河南省种子植物区系的种类组成、地理成分 (属、种 2个层次上 )等进行了系统的分析 ,在此基础上概括出河南植物区系的基本特征为 :(1 )植物种类比较丰富 ,多样性较高 ;(2 )起源古老 ;(3 )地理成分复杂 ,温带成分略占优势 ,过渡性突出 ;(4 )中国特有植物比较丰富。

Floristic study of spermatophyte of Henan Province

Henan Province locates in Central China Plains (comprising the middle and lower reaches of the Yellowe River),transitional zone from temperate to subtropic,from humid to semihumid and semarid,ranging from longitude 110°21′ to 116°39′ E,latitude 31°23′ to 36°22′ N. Its varied physical conditions and long geologic history made it abundant in species and complex in floristic elements. This paper is concerned with analysis of the composition and geographical elements of the flora in Henan Province,using principle of florology based on the latest floristic data. It consists of four parts,which are the geographical background,composition,distribution types of the flora and conclusion. The first part gives a brief introduction of the environmental factors influencing the development and distribution of the flora in Henan Province. The second part mainly analyses the floristic composition and types of life form of the spermatophyte flora. One of the results is that there are 2 954 wild species in 896 genera and 152 families,accounting for 10%,29% and 45% of the same kind plants of China respectively;among which 24 species in 14 genera and 6 families belong to Gymnosperm,1 831 species to herb (62%) and 1 123 species to xylophyta (38%). Another is that the order of the first 10 famies of seed plant in Henan is similar to that of Qinling mountain,Central China and North China three regions. The third part focuses on the study of distribution types of seed plant of Henan in two classic level,namely genera and species. The results are as follows:(1)In the genera level,there are 15 types and 18 variants of distribution types. Of them the genera belonging to temperate types are the most,the tropic ones second and the intermediate third. It shows the character of transition conspicuous in the flora of Henan Province; (2)There are 15 types and 24 subtypes in the species level. It is found that this province is rich in endemic to china distribution type,which accounts for 52.5% of total species in the region and are more than those of any other floral region in north part of china. In these species,ones belonging to subtropics are the most,ones to spreading from subtropics to temperate second and ones to temperate third. In the species not belonging to type of endemic to china,typical temperate type are the most,ones to Eastern Asia second and ones to tropic third. Sum up above,typical temperate,tropic-subtropics and temperate-subtropics respectively account for about 1/3 of the total species in Henan Province. The last part summarizes the characteristic of the flora of Henan Province. The conclusion is as follows:(1)It is rich in spermatophytes; (2)It is age-old in origin; (3)Its geographical elements are complex,but temperate type is the dominant and the character of transition conspicuous in the flora; (4)It is rich in endemic species to chine,ranking the first place in the northern areas in China;besides the difference between areas is obvious.