Abstract: Eight years old sand-fixing plants planted on shifting dunes have well-developed rhizo-sphere microorganisms.Hedysarum scoparium,Caragana korshinskii and Artemisia ordosica have more microorganisms in their rhizosphere than beyond it.But,Hedysarum scoparium hasless non-spore-bearing bacteria in it's thizosphere.The development of soil in the rhizo-sphere is better than that beyond it because of the stronger microorganism activities in therhizosphere.The crust and cloddy structure layer are thicker.

Key words: Conceptual framework, Ecological basis, Ecosyste m management