Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2017JG004284 |
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
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ISSN | 2169-8953 |
EISSN | 2169-8961 |
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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