【摘要】 <正> 在宁夏中卫沙坡头铁路防沙研究地段,多年人工植被沙丘的沙土不断发育,在沙丘表面形成结皮层,结皮下面形成块状沙土层,导致沙丘逐渐固定,无疑这与机械沙障固沙和植物固沙措施有直接关系。从流动沙丘向固定沙丘不仅表面发生变化,内在因素的变化也起着重要作用,分别研究这些内外因素,探讨其相互更多还原

【Abstract】 Eight years old sand-fixing plants planted on shifting dunes have well-developed rhizo-sphere microorganisms.Hedysarum scoparium,Caragana korshinskii and Artemisia ordosicahave 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.更多还原