Tracing Sediment Movement on a Semiarid Watershed using Rare Earth Elements

被引：38
|
作者：
Polyakov, V. O. [1 ]
Kimoto, A. [2 ]
Nearing, M. A. [1 ]
Nichols, M. H. [1 ]
机构：
[1] ARS, USDA, SW Watershed Res Ctr, Tucson, AZ 85719 USA
[2] Pima Cty Reg Flood Control, Tucson, AZ 85701 USA
来源：
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 2009年 / 73卷 / 05期
关键词：
SOIL-EROSION; SUSPENDED SEDIMENT; TRACERS; DEPOSITION; TRANSPORT; OXIDES; IDENTIFICATION; CESIUM-137; TRACKING; PB-210;
D O I：
10.2136/sssaj2008.0378
中图分类号：
S15 [土壤学];
学科分类号：
0903 ; 090301 ;
摘要：
A multi-tracer method employing rare earth elements (REE) was used to determine sediment yield and to track sediment movement in a small semiarid watershed. A 0.33-ha watershed near Tombstone, AZ was divided into five morphological units, each tagged with one of five REE oxides. Relative contribution of each unit to the total sediment yield was determined by collecting runoff and sediment, and the spatial redistribution of sediment was determined from sampling the soil surface. Average sediment yield was 1.0 Mg ha(-1) yr(-1) from the entire watershed, but varied between 0.1 Mg ha(-1) yr(-1) from the upper slope to 5.0 Mg ha(-1) yr(-1) from the lower channel. Little re-deposition occurred in the channels indicating an effective transport system. The erosion pattern and rates were in agreement with the current morphology of the watershed, which has a well-developed channel network.
引用
收藏
页码：1559 / 1565
页数：7
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