关键词: 地表, 沙尘水平通量, 降尘量, 乌兰布和荒漠生态系统

Abstract: It is of great significance to study the characteristics of sand-dust varied with height for revealing the distribution traits of sand-dust in the surface layer. This paper collected data of horizontal sand-dust fulx and dust fall amount from the dust observation tower within the height of 50 m, located in the northeast of Ulan Buh Desert; and studied the effect of regional protection forest on change features of sand-dust horizontal and vertical flux. The results indicated that: ① Both horizontal sand-dust flux and dust fall amount decreased along with the height increasing. The distribution characteristics of horizontal dust flux and dust fall amount with height accorded with power function inside of the shelterbelt, and the distribution characteristics of them accorded with exponential function outside of the shelterbelt. ② The horizontal dust flux and dust fall amount were positively correlated. They could be presented by linear functions. ③ Both horizontal dust flux and dust fall amount with wind speed presented a linear relationship.

Key words: surface layer, horizontal sand-dust flux, dust fall amount, Ulan Buh desert ecosystem