کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9447942 | 1305577 | 2005 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rapid nitrate loss from a contaminated desert soil
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
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چکیده انگلیسی
A 1.6 ha plot of Atriplex canescens (fourwing saltbush) was established in a desert soil at a former uranium ore-processing plant, near Monument Valley, Arizona, to remediate nitrate and ammonium N contamination. The plants were irrigated to stimulate growth and N uptake. However, NO3â loss from the soil was unexpectedly rapid. Initially, the soil contained approximately 180 mg kgâ1 NO3â-N distributed at depths up to 4.6 m, but concentrations decreased to 80 mg kgâ1 after 41 months. Losses occurred throughout the plot at all soil depths. NH4-N remained unchanged (ca.180 mg kgâ1). Soil moisture was generally below field capacity and soil-water flux showed no net downward movement over the course of the study. A salt balance showed a 10% decrease in soluble salts during the study, attributable to the loss in NO3â. Residual soluble soil N became progressively enriched in 15N over time, consistent with biological denitrification. Additionally, microcosm studies indicate significant potential denitrification rates on the plot but not for control soils. Total losses of NO3â-N were 1360 kg haâ1 yr â1. These findings of rapid denitrification in the vadose zone of a desert soil are unique and may offer a low-cost method for NO3â remediation at similar sites. These findings are also of interest due to the depth at which the losses occurred and the possibility that considerable amounts of naturally occurring NO3â in deep vadose zone desert soils in the southwestern US could be similarly mobilized by changing land use practices or climate change.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volume 61, Issue 1, April 2005, Pages 119-136
Journal: Journal of Arid Environments - Volume 61, Issue 1, April 2005, Pages 119-136
نویسندگان
C.A. McKeon, F.L. Jordan, E.P. Glenn, W.J. Waugh, S.G. Nelson,