A Floristic Study Of Higher Plant Along The Line Along Greatwall Of Qianxi, Hebei

The line along Great wall in Qianxi in Hebei is located in the Qianxi county, Hebei Province, its geographical position of 39°57'─40°27'N, 118°06'─118°37'E and its area of 820 square kilometers. Being abundant in biodiversity is Green Ecology barriers and important water conservation in Beijing,Tianjing,Tanshang,Qinhuangdao and so on. Therefore, to study the biodiversity of the system, it is great theoretical and practical significance of environmental protection and economic and social sustainable development for the Beijing,Tianjin,Tangshan area.From May 2005 to Augest 2007, the author carried on series of systematic and comprehensive investigations on several occasions the line along Great wall in Qianxi in Hebei with the teachers and students of Life Science Research College in Hebei Normal University. This study is mainly based on the previous study, identification, the study concluded by the authors collected more than 3,000 specimens of seeds plants, aimed at scientific theoretical guidance of the development and utilization of resources, introduction of domesticated provide The line along Great wall in Qianxi in Hebei through the flora composition and characteristics, vegetation types and distribution of resources and the types of plant. At the same time, Green Ecological tourism industry layed the foundation for sustainable development along the Great Wall of Qianxi,Hebei.Field investigation and indoor analysis had been combined in this study. Via data collection, field investigation and indoor disposal three phases, the concrete results are as following:1. There are 97 species wild seed plants (contain under species unit) belonging to 364 genera and 682 families in the line along Great wall in Qianxi in Hebei Hereinto, 5 species belonging to 4 genera and 3 families are gymnosperm, as well as 677 species of angiosperm belonging to 360 genera and 94 families (80 species of dicotyledon belonging to 288 genera and 537 families,140 species of monocotyledon belonging to 71 genera and 14 families). It is one of the regions that are comparatively abundant in wild seed plants flora in Hebei province.2. 9 dominant families consist of 327 species and 153 genera. These figures represent for 9.3%, 42.0% and 47.9% of the total families, genera and species respectively of the local seed plant flora in the line along Great wall in Qianxi in Hebei. The dominant families consist of the principal part of the composing genera and species. Meanwhile, minitype families and regional monospecies families consist of the principal part of the composing families. These all enrich the whole component of the seed plant flora.3. The number of the middle genus, small genus and regional monospecies genus which include 522 species is amount to 343, respectively accounting for 93.7% and 76.5% of the total genera and species in the line along Great wall in Qianxi in Hebei. They consist of the principal part of the composing genera of this flora and also are the important component on the genera and species diversity of the seed plant flora in Great Wall along line in Qianxi. The number of the large and middle genus which includes 160 species is amount to 23, only accounting for 6.3% and 23.5% of the total genera and species respectively. Though the proportion is relatively low, these large genera, middle genera and their species belong to the dominant genera and species in the flora. Therefore, to know the constituent of these genera and their change has an important and scientific significance for mastering the transformation and succession of the vegetation of the Reserve. The monospecies genus is amount to 7 of the total genera, and most of them are of the temperate zone type. There are 3 Cosmopolitan genera and 3 North Temperate genera in the dominant genera areal-types.4. In the view of Professor Li Xi-Wen about the areal-types of genera of China seed plants, the 97 families in the region fall into 7 types. 36 families accounting for 37.1% and main 33 families accounting for 34% of the total family and respectively belong to the Tropic areal-type.There are 29 families accounting for 30% that belong to Temperate. Among these family, 25 families belong to North Temperate account for 25.8%. It showed that the number is no obvious advantages between of tropical nature and of the temperate nature on the family level by family geographical composition analyses, which incarnate this flora origin in the region with close ties of tropical .5. According to the ordination of R/T (tropic genera / temperate genera), the ratio of R/T takes on a descendant trend as the increasing of latitude to the data of 10 areas and an apparent rule on latitude zonation of floristic variation was expressed.In the addenda, the list of seed plants, the index for the family and genus, other critical resource plants and more than 70 reference literatures are additive. The thesis includes 6 figures, 16 tables and 2 plate.