灌丛沙堆作为绿洲和沙漠之间一道重要的生态屏障，其最终的演化方向对于绿洲地区的生态环境稳定有着很大影响，2010年至2013年数次向石羊河尾闾青土湖注入生态用水，该区域大片白刺灌丛沙堆被水淹。因此，系统的调查研究青土湖区域间断性水淹前后不同演化阶段个体白刺沙堆的特征，明确白刺沙堆在群落范围内的空间分布格局，同时探讨沙堆上其它植物的分布格局以及白刺沙堆促进生物多样性的基础作用和自身生存适应性特征；明确白刺群落的土壤分布特征，探讨白刺沙堆在群落生态系统中结构和功能的基础性地位有其必要性和特殊意义，同时为其它地区白刺资源的保护和利用提供参考，也能为正确评估青土湖生态输水的生态效益及该地区植被保育和生态环境恢复提供科学依据。

The final evolution direction of Nabkhas has a lot of effect on the ecological environment of the oasis area, since the Nabkhas is an important ecological barrier between oasis and desert. The huge Nitraria tangutorun nebkha in this area was drowned due to several addition ecological water to the Tail-streams of Shiyang River-Qingtu Lake from 2010 to 2013. Trough systematic investigating Nitraria tangutorun nebkha individuals characteristics in different stages of evolution before and after intermittent submergence, it will clear the spatial distribution within the range of Nitraria tangutorun nebkha the community, also will discuss the distribution pattern of other plants and the fundamental role of Nitraria tangutorun nebkha promoting biodiversity in the sand and their own survival adaptive characteristics; it will clear soils distribution of Nitraria tangutorun community, it is necessary and has special significance to explore the basic position of structure and function in the community and ecosystem, while it will provide a reference for the conservation and utilization of resources in other areas of Nitraria tangutorun, but also it will provide the basic data and scientific basis for the correct assessment of the overall efficiency of Qingtu Lake ecology, importing water program and adjusting the rational allocation of Shiyang River basin resources of the entire water resource.