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Influence of a riparian wetland on nitrate and herbicides exported from an agricultural field


, : Influence of a riparian wetland on nitrate and herbicides exported from an agricultural field. Journal of agricultural and food chemistry7, 50(15): 4424-4429

Agrochemicals are a major source of nonpoint pollution. Forested corridors along stream channels (riparian zones) are thought to be potential sites for removal of agricultural contaminants from ground and surface waters. First-order riparian wetlands are reputed to be especially effective at groundwater remediation. The study site is a fairly typical (for eastern Maryland) small, first-order stream in an agricultural watershed. Preferential flow supplies most of the stream water within the riparian headwater wetland. This upstream area also contains the highest average stream N and pesticide loads in the entire first-order riparian system. Zones of active groundwater emergence onto the surface display high concentrations of nitrate throughout the soil profile and in the exfiltrating water, whereas inactive areas (where there is no visible upwelling) show rapid attenuation of nitrate with decreasing depths. Atrazine degradation products appear to penetrate more readily through the most active upwelling zones, and there is a correlation between zones of high nitrate and high atrazine metabolite levels. Deethylatrazine/atrazine ratios (DAR) seem to indicate that stream flow is dominated by ground water and that much of the ground water may have reached the stream via preferential flow. Remediative processes appear to be very complex, heterogeneous, and variable in these systems, so additional research is needed before effective formulation and application of riparian zone initiatives and guidelines can be accomplished.

US$19.90

PMID: 12105980

DOI: 10.1021/jf011057n


Other references

Anonymous, 1979: Problems in animal breeding and veterinary science. Papers abstracted appear in the appropriate sections of ABA. Papers mainly of domestic Russian interest or of a non-analytical nature are listed below.

Batey, R.; Cao, Q.; Madsen, G.; Pang, G.; Russell, A.; Clancy, R., 1998: Decreased tumor necrosis factor-alpha and interleukin-1alpha production from intrahepatic mononuclear cells in chronic ethanol consumption and upregulation by endotoxin. The relationship between the changes in liver pathology and the production of interleukin (IL)-1alpha, IL-6, and tumor necrosis factor-alpha (TNF-alpha) by intrahepatic mononuclear cells was studied in rats fed alcohol and subsequently exposed to...

Herbarth, Olf, 1998: Health impacts. Fenger, J [Editor], Hertel, O [Editor], Palmgren, F [Editor] Environmental Pollution, Vol 1; Urban air pollution: European aspects 329-341

Bar Shira, E.; Friedman, A., 1995: Role of antigen structure in oral tolerance Requirement for intact antigen for tolerance induction. 9TH INTERNATIONAL CONGRESS OF IMMUNOLOGY The 9th International Congress of Immunology : 610

Rozhkova, Vt, 1983: Reciprocal sunflower hybrids. Nauchno teknicheskii biulleten Vsesoiuznogo Nauchno Issledovatelskogo Instituta Maslichnykh Kultur: 2) 13-16

Naylor, D.F., 2001: Basics of internet search; so many websites, so little time. Current Surgery 58(3): 286-287

Chiang, T.M.; Postlethwaite, A.E., 2007: A cell model system to study regulation of phosphotidylinositol 3-kinase and protein kinase B activity by cytokines/growth factors produced by type I collagen stimulated immune cells from patients with systemic sclerosis. We have reported that posttranslational modification of systemic sclerosis patients' platelet phosphoinositide 1,3,4,5 kinase (PI 3-K) and protein kinase B (Akt) altered their enzymatic activities. In the present investigation, we have estab...

Sairafi, D.; Mattsson, J.; Uhlin, M.; Uzunel, M., 2012: Thymic function after allogeneic stem cell transplantation is dependent on graft source and predictive of long term survival. T-cell deficiency after allogeneic stem cell transplantation (ASCT) is common and has major impact on clinical outcome. In this retrospective study 21 patients were analyzed with regards to levels of T-cell receptor excision circles (TRECs) during...

Teramatsu, T., 1977: Treatment of advanced lung cancer. Kyobu Geka. Japanese Journal of Thoracic Surgery 30(7): 539-540

Das, S.; Reusch, R.N., 2001: Mg2+ facilitates opening of potassium channel of Streptomyces lividans at physiological pH. Biophysical Journal 80(1 Part 2): 128a, January