In order to find out the distribution of Alnus sibirica of Tangyuan County ,We investigated Alnus sibirica natural resources to conduct a survey and analyzed the status of resources.

The significance of construction of ecological demonstration area in Qingyuan county lied in promoting economic construction by means of environmental construction.

By analysis of conditions, the present situation in exploitation and utilization and the market of edible wild herb resources in Qingyuan county,this paper put forward its exploitative opinion and the guarantee measures to promote the local agticulture development.

Geological hazards problems of Ningxia Haiyuan county and its prevention countermeasures;

Patterns of Agricultural Sustainable Development in Haiyuan County;

Objective To develop investigation and master situation of plague foci in Xiji County and Haiyuan County of Ningxia, and formulate the prevention measures.

It is about in 1960 s that is introduced to Guyuan county ,its development is slow and fluctuant at larger before the new variety “Ningqi No.

This paper is based on the investigation in two townships in Guyuan county, Ningxia Hui municipality and the analysis point out that the floating labors posse.

On the geographical foundation and vistas of Guyuan Town in Ningxia;