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Duolun County is a important part of Sandy steppe zone in the north of China which is located in the central of Inner Mongolia,the southeastern tip of Xilin Gol League,the southern edge of Otindag Sandy Land.In recent decades,as a result of land reclamation,overgrazing and other irrational development and utilization of drought coupled with high winds and other natural factors,resulted in the destruction of vegetation,grassland degradation,the ecological environment has changed dramatically,good pasture species reduced gradually or even disappeared,Desertification has accelerated,all of these made Duolun County became one of the birthplaces as the frequent occurrence of sandstorms in northern China.In this paper,the Duolun County as an independent unit flora,investigated the flora of its seeds,carry out a survey of plant resources of the Duolun County and carried a Field investigations in the artificial repair area.We analyzed the resources of the flora, changes in the reconstruction of the resumption of research,in order to provide a scientific basis for the protection and rational utilization of diversity of plant resources in Duolun and for the vegetation restoration and reconstruction.Study findings were as follows:(1) Duolun County has a total of 75 Section 258 families 544 kinds of seed plants,respectively,accounts for the total number of wild seed plants in the region of Inner Mongolia 64.1%,3 7.5%and 21.1%.Divided into four major categories of resources:consumption of resources by end-use plants,medicinal plant resources, industrial resources,plant protection resources and viewing plant resources.(2) Through structural changes in land use,reflecting the strengthening of the local policy of returning farmland to forest and grasslands,with good vegetation recovery trend.Different land types for improving the ecological environment,the stability of agricultural production,and promote further development of animal husbandry,as well as a wide range of economic benefits brought about by both a positive role in promoting.(3) Through the ecological restoration of the building increase the ground vegetation coverage,after laying a biological barrier in the mobile sand dune,not only to restore the vegetation of land desertification,but also increase the ground coverage, and made the Mobile sand dune turned into and semi-fixed and fixed sandy land gradually.(4) Fencing has a notable impact in the composition species of community,the cover,the height,the total biomass.
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