Through the comparison on wind-resistant effect among five kinds of forest for wind resistance and sand prevention and shifting sandy land,the results show: Haloxylon ammondendron and Hedysarum scaparium have better wind-resistant effects because of large plant size,and Calligonum mongolicum,Hedysarum fruticosum var.

Study on Soil Wind Erosion and Efficiency of Wind Prevention and Sand Resistance of Artificial Vegetation at Sand-land in Yongding River in Beijing;

The results showed that: with increase in age,the site quality of plantation for wind protection and sand fixation was changed obviously,bulk density decreased,soil porosity increased,soil water holding capacity improved and soil fertility enhanced,the physical and chemical characteristics of soil were improved to some extent.

The plant of resisting wind and snow woodland, which is not only great to reduce the wind and snow disaster influence to vehicles,but to improve local ecological environment as well.

The windbreak system in arid areas is generally consisted of 3 belts:belt enclosed for restoration of natural vegetation,belt of sand-fixation trees and the forest network inside the oasis.