Arid
DOI10.2134/jeq2013.11.0453
Soil, Plant, and Terrain Effects on Natural Perchlorate Distribution in a Desert Landscape
Andraski, B. J.1; Jackson, W. A.2; Welborn, T. L.1; Boehlke, J. K.3; Sevanthi, Ritesh2; Stonestrom, D. A.4
通讯作者Andraski, B. J.
来源期刊JOURNAL OF ENVIRONMENTAL QUALITY
ISSN0047-2425
EISSN1537-2537
出版年2014
卷号43期号:3页码:980-994
英文摘要

Perchlorate (ClO4-) is a contaminant that occurs naturally throughout the world, but little is known about its distribution and interactions in terrestrial ecosystems. The objectives of this Amargosa Desert, Nevada study were to determine (i) the localscale distribution of shallow-soil (0-30 cm) ClO4- with respect to shrub proximity (far and near) in three geomorphic settings (shoulder slope, footslope, and valley floor); (ii) the importance of soil, plant, and terrain variables on the hillslope-distribution of shallow-soil and creosote bush [Larrea tridentata (Sesse & Moc. ex DC.) Coville]ClO4-; and (iii) atmospheric (wet plus dry, including dust) deposition of ClO4- in relation to soil and plant reservoirs and cycling. Soil ClO4- ranged from 0.3 to 5.0 mg kg(-1). Within settings, valley floor ClO4- was 17x less near shrubs due in part to enhanced leaching, whereas shoulder and footslope values were similar to 2x greater near shrubs. Hillslope regression models (soil, R-2 = 0.42; leaf, R-2 = 0.74) identified topographic and soil effects on ClO4- deposition, transport, and cycling. Selective plant uptake, bioaccumulation, and soil enrichment were evidenced by leaf ClO4- concentrations and Cl-/ClO4- molar ratios that were similar to 8000x greater and 40x less, respectively, than soil values. Atmospheric deposition ClO4- flux was 343 mg ha(-1) yr(-1), similar to 10x that for published southwestern wet-deposition fluxes. Creosote bush canopy ClO4- (1310 mg ha(-1)) was identified as a previously unrecognized but important and active reservoir. Nitrate delta O-18 analyses of atmospheric deposition and soil supported the leaf-cycled-ClO4- input hypothesis. This study provides basic data on ClO4- distribution and cycling that are pertinent to the assessment of environmental impacts in desert ecosystems and broadly transferable to anthropogenically contaminated systems.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000336275700021
WOS关键词CENTRAL NEW-MEXICO ; MOJAVE-DESERT ; UNITED-STATES ; ISOTOPIC COMPOSITION ; OXYGEN ISOTOPES ; WATER-MOVEMENT ; FRESH-WATER ; HIGH-PLAINS ; NITRATE ; ACCUMULATION
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
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/2XILL650/183243
作者单位1.US Geol Survey, Carson City, NV 89701 USA;
2.Texas Tech Univ, Lubbock, TX 79409 USA;
3.US Geol Survey, Reston, VA 20192 USA;
4.US Geol Survey, Menlo Pk, CA 94025 USA
推荐引用方式
GB/T 7714
Andraski, B. J.,Jackson, W. A.,Welborn, T. L.,et al. Soil, Plant, and Terrain Effects on Natural Perchlorate Distribution in a Desert Landscape[J]. United States Geological Survey,2014,43(3):980-994.
APA Andraski, B. J.,Jackson, W. A.,Welborn, T. L.,Boehlke, J. K.,Sevanthi, Ritesh,&Stonestrom, D. A..(2014).Soil, Plant, and Terrain Effects on Natural Perchlorate Distribution in a Desert Landscape.JOURNAL OF ENVIRONMENTAL QUALITY,43(3),980-994.
MLA Andraski, B. J.,et al."Soil, Plant, and Terrain Effects on Natural Perchlorate Distribution in a Desert Landscape".JOURNAL OF ENVIRONMENTAL QUALITY 43.3(2014):980-994.
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