DOI: 10.1002/2017JG004284
Scopus记录号: 2-s2.0-85041218436
论文题名: Quantifying Postfire Aeolian Sediment Transport Using Rare Earth Element Tracers
作者: Dukes D. ; Gonzales H.B. ; Ravi S. ; Grandstaff D.E. ; Van Pelt R.S. ; Li J. ; Wang G. ; Sankey J.B.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 1 起始页码: 288
结束页码: 299
语种: 英语
英文关键词: drylands
; land degradation
; sediment tracers
; wildfires
; wind erosion
Scopus关键词: eolian process
; grassland
; land degradation
; quantitative analysis
; rare earth element
; sediment transport
; soil erosion
; tracer
; transition zone
; wildfire
; wind erosion
; Chihuahuan Desert
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 technique—the 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114733
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth and Environmental Science, Temple University, Philadelphia, PA, United States; Wind Erosion and Water Conservation Research, USDA-ARS, Big Spring, TX, United States; Department of Geosciences, University of Tulsa, Tulsa, OK, United States; Southwest Biological Science Center, Grand Canyon Monitoring and Research Center, U. S. Geological Survey, Flagstaff, AZ, United States
Recommended Citation:
Dukes D.,Gonzales H.B.,Ravi S.,et al. Quantifying Postfire Aeolian Sediment Transport Using Rare Earth Element Tracers[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)