The Floristic Analyze Of Plant Resources And Psammophyte Plants Of Otindag Sand Land

Otindag Sand Land belongs to temperate semiarid,dry zone of China,witch has obviously continental clime.Because of that this zone has less plants compared with other climate zone ,inversely Otindag Sand Land diversity also is abundant in mongolia. And it's east is meadow steppe;westn is hungriness steppe;type steppe lies in the middle of it.This paper analysed its plant resources in the fact of quantity,including its basic form of plant resources,its familis's diversity,life-form,ecological type, its Psammophyte plants,and characteristic of distribut type.The main conclusion and talk points as follows:There are1083 species of fasicilar plants in Otindag Sand Land,which belong to 392 genera and 83 families.and respectively 47.71%,57.56% and 63.43% of total of Mongolia plants.Indicated that Otindag Sand Land plants resource is relatively abundant; Otindag Sand Land plant resources big and biggish family is only 10.59% of total family,but its species is 62.42% of total, This indicated that the big and biggish family is dominant in this florisitic,and main species distributed in big and biggish family,dominant phenomena is very obviously;Characteristics of life forms show that perennialherb is dominant in Otindag Sand Land floristic, and proportion is 67.50% of Perennialherbs;The mesophyte dominate absolutely among flora from Otindag Sand Land, which shows particularity of the geographical,has 606 species, percentage 55.96% of total, Although the xerophils less than the mesophyte,they are dominant population and play a important role in ecological system of Otindag Sand Land;Although psammophyte has 288species that is 26.59% of total plant resources of Otindag Sand Land witch has 1083 species ,they distributed widely, all over of this zone can find it, witch are lot of initial and dominant palnts in this floristic, its made a key effection in ecological system of Otindag Sand Land;Analysis of the psammophyte floristic elements based on families,genera shows they are very complex and the areal-types are diversity,the total of 48families can be divided into 4 types and 2 subtypes,the total 173 genera can be divided into 14 types and 9 subtypes,all areal-types can be find in this region except Tropical Asial & Trop.In the family level Temperate type is 79.17% of total,tropical type is 18.75% of total. In the genera level Temperate type is 54.20% of total, tropical type is 10.99% of total. This indicated that Temperate type is dominant in this region, this area is obvious temperate characteristics of the flora,concurrently have tropical characteristics wich indicated this area have relationship with tropical plants flora.