CHARACTERISTICS OF AEOLIAN DUSTS IN NIGER, WEST-AFRICA

被引：115

作者：

DREES, LR ^{[1
]}

MANU, A ^{[1
]}

WILDING, LP ^{[1
]}

机构：

[1] INRAN TROPSOILS,NIAMEY,NIGER

来源：

GEODERMA | 1993年 / 59卷 / 1-4期

关键词：

D O I：

10.1016/0016-7061(93)90070-2

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Dust-laden Harmattan winds are a recognized phenomenon of the Sahel region of Africa. Atmospheric dust inputs have been monitored at two sites in Niger, West Africa since July 1985. Dust traps of the open bucket type were placed 2.5 and 5 m above the soil surface. Dust was collected and analyzed quarterly for total infall, particle size, mineralogy, and water-soluble and exchangeable cations. Surface soil samples adjacent to the dust traps were also analyzed for the same properties. Of the similar to 2000 kg ha(-1) yr(-1) of dust infall, over half came during April to July, after the Harmattan wind season. Atmospheric dust inputs varied by season as did particle size, being coarser during periods of minimal infall. The dust contributes similar to 4.8, 2.8, 1.1 and 0.6 kg ha(-1) yr(-1) of exchangeable plus water-soluble Ca, K, Mg and Na, respectively. The nutrient status of the dust is substantially greater than the native soil and may serve as a nutrient renewal vector.

引用

页码：213 / 233

页数：21

共 44 条

[31] DUST DEPOSITION IN RELATION TO SITE, SEASON, AND CLIMATIC VARIABLES [J].