关键词: 沙柳, 沙障, 防风固沙, 荒漠化

Abstract: In this study, the material used to build straw checkerboard is branch of \%Salix psammophila,\% one native shrub in desert area. The sizes of checkerboard are 1 m×1 m,1 m×2 m, 2 m×2 m,2 m×3 m,2 m×4 m, 2 m×5 m,3 m×3 m, 3 m×4 m, 4 m×4 m, 4 m×5 m, 3 m×6 m. Results show that different sized checkerboards have different effects to reduce the sand flux intensity. Sand flux intensity varies logarithmically with wind velocity in the small sized checkerboard. Meanwhile, sand flux intensity varies exponentially with wind velocity in the large sized checkerboard. At the foot of dune with checkerboard on it, the sand flux intensity in 0~4 cm surface layer is significantly larger than that at the slope and the top of dune. The checkerboards with a size area equal to or less than 1 m² can completely control wind erosion. If the size of checkerboard increases to over certain area, wind erosion will increase fast considerably. When considered both the effect of checkerboard on wind erosion control and its cost, small sized checkerboard has good effect under strong wind condition; the larger sized checkerboard is better under relatively weak condition.

Key words: Salix psammophila, checkerboard, reducing wind and stabilizing sand, desertification