干旱区生态环境知识资源中心

The research focuses on applications of ecological protections in the desert route the Sanggendalai similar to Gongzhugeng highway crossing Otindag Sandy land. Some protective measures are brought forward, as sand barriers of low upright grid, sand barriers of tall upright grid, and composite typed sand barriers etc. Furthermore, these sand barriers and their sand breaking effectiveness like soil improvement, vegetation recovery etc are traced by means of field survey. Namely, (1) the low upright sand barriers have raised surface roughness up to 5.64cm, and wind velocity at the near surface (0.25m) within sand barrier reduces to 2.39m/s from previous 6.5m/s, which means the surface windproof efficiency averages to 63.1%; the near surface wind velocity within the high upright sand barrier goes down to 2.7m/s from 6.5m/s, its wind proof efficiency gains 58.5%; the near surface wind velocity within the composite sand barriers downgrades to 4.6m/s from previous 9.5m/s, of its maximum windproof efficiency up to 74.8%. (2) Compared to sand drifting area, the bulk density of soil inside the low and high upright barriers drops by 14.2%, soil porosity rises by 16% and soil water content upward by 77.8% at peak. The same to the increase of soil organic matter, hydrolysable nitrogen, available P content, available K content etc, that illuminate amelioration of local soil because of various sand barriers. (3) The applications of ecologic protections improve the local route environment apparently, 65% similar to 70% of its vegetation coverage fraction in sand drifting area after the highway project in comparison with 5% previously.