Damage Law and Vegetation Restoration of Salix psammophila Sand Barrier in Mu Us

The study was conducted to research the Salix psammophila barrier set on the mobile dunes in batumu, Southeast of the Mu Us Sandy Land. A large amount of filed investigation and statistical method were adopted to reveal the damage of the S. psammophila barrier in different specifications, slops and boundaries and vegetation restorations. Relationships between vegetation growth and barrier damage were analyzed. Restles show that average damage degree of the sand and sand barrier is 52.89% after 5 years of sand barrier laying, and the vegetation restoration ability of 1 m×1 m sand barrier is worse than that of 2 m×2 m sand barrier. The damage degree of sand barrier laid in different landforms of the dune is from strong to weak as follows: the sorting of dune at the top of the central > leeward slope > Leeward slope > windward slope bottom > windward slope in the upper. The damage degree of different sides of the same barrier in S. psammophila sand-barrier is as follows: windward below > windward above > left before the wind > right before the wind. The damage degree of the sand barrier right side is negative correlated with the vegetation coverage. The greater the extent of the damage, the smaller the vegetation coverage and it affects the natural restoration capacity of vegetation. Gravity (slope) and sand burying are the main factors causing the damage of S. psammophila barriers, and the S. psammophia barriers plays an important facilitating role in the recovery of vegetation in the flowing sand dunes.