Arid
DOI10.1002/2017JG004284
Quantifying Postfire Aeolian Sediment Transport Using Rare Earth Element Tracers
Dukes, David1; Gonzales, Howell B.1; Ravi, Sujith1; Grandstaff, David E.1; Van Pelt, R. Scott2; Li, Junran3; Wang, Guan3; Sankey, Joel B.4
通讯作者Ravi, Sujith
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
EISSN2169-8961
出版年2018
卷号123期号:1页码:288-299
英文摘要

Grasslands, which provide fundamental ecosystem services in many arid and semiarid regions of the world, are undergoing rapid increases in fire activity and are highly susceptible to postfire-accelerated soil erosion by wind. A quantitative assessment of physical processes that integrates fire-wind erosion feedbacks is therefore needed relative to vegetation change, soil biogeochemical cycling, air quality, and landscape evolution. We investigated the applicability of a novel tracer techniquethe use of multiple rare earth elements (REE)to quantify soil transport by wind and to identify sources and sinks of wind-blown sediments in both burned and unburned shrub-grass transition zone in the Chihuahuan Desert, NM, USA. Results indicate that the horizontal mass flux of wind-borne sediment increased approximately threefold following the fire. The REE tracer analysis of wind-borne sediments shows that the source of the horizontal mass flux in the unburned site was derived from bare microsites (88.5%), while in the burned site it was primarily sourced from shrub (42.3%) and bare (39.1%) microsites. Vegetated microsites which were predominantly sinks of aeolian sediments in the unburned areas became sediment sources following the fire. The burned areas showed a spatial homogenization of sediment tracers, highlighting a potential negative feedback on landscape heterogeneity induced by shrub encroachment into grasslands. Though fires are known to increase aeolian sediment transport, accompanying changes in the sources and sinks of wind-borne sediments may influence biogeochemical cycling and land degradation dynamics. Furthermore, our experiment demonstrated that REEs can be used as reliable tracers for field-scale aeolian studies.


英文关键词sediment tracers wind erosion land degradation drylands wildfires
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000425517800021
WOS关键词WIND EROSION ; SAGEBRUSH STEPPE ; SEMIARID GRASSLANDS ; DESERT GRASSLAND ; DOMINATED LANDSCAPES ; CHIHUAHUAN DESERT ; SOIL-EROSION ; NEW-MEXICO ; VEGETATION ; FIRE
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210991
作者单位1.Temple Univ, Dept Earth & Environm Sci, Philadelphia, PA 19122 USA;
2.USDA ARS, Wind Eros & Water Conservat Res, Big Spring, TX USA;
3.Univ Tulsa, Dept Geosci, Tulsa, OK 74104 USA;
4.US Geol Survey, Southwest Biol Sci Ctr, Grand Canyon Monitoring & Res Ctr, Flagstaff, AZ 86001 USA
推荐引用方式
GB/T 7714
Dukes, David,Gonzales, Howell B.,Ravi, Sujith,et al. Quantifying Postfire Aeolian Sediment Transport Using Rare Earth Element Tracers[J]. United States Geological Survey,2018,123(1):288-299.
APA Dukes, David.,Gonzales, Howell B..,Ravi, Sujith.,Grandstaff, David E..,Van Pelt, R. Scott.,...&Sankey, Joel B..(2018).Quantifying Postfire Aeolian Sediment Transport Using Rare Earth Element Tracers.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,123(1),288-299.
MLA Dukes, David,et al."Quantifying Postfire Aeolian Sediment Transport Using Rare Earth Element Tracers".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 123.1(2018):288-299.
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