Vetiver Grass and Micropollutant Leaching Through Structured Soil Columns Under Outdoor Conditions

In Burkina Faso, significant amounts of endosulfan are applied to cotton fields; in addition, urban vegetable agriculture is often characterised by high fertiliser inputs, such as urban solid wastes containing heavy metals （e.g., Cu and Cd）. Thus, the relevance of surrounding cotton and urban vegeta...

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Bibliographic Details
Published inPedosphere Vol. 26; no. 4; pp. 522 - 532
Main Authors DOUSSET, Sylvie, ONDO ZUE ABAGA, Norbert, BILLET, David
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2016
Université de Lorraine-CNRS-Laboratoire Interdisciplinaire des Environnements Continentaux(LIEC), 54506 Vandoeuvre-lès-Nancy(France)
Elsevier
Subjects
Agricultural sciences
cadmium
copper
Earth Sciences
endosulfan
Environmental Engineering
Environmental Sciences
Geochemistry
Life Sciences
Lixisol
lysimeter
Sciences of the Universe
Soil study
transfer
Vertisol
Vetiveria zizanioides
农业土壤
土柱
城市固体废物
室外
布基纳法索
微量污染物
结构化
香根草
Burkina Faso
Lixisol
lysimeter
transfer
endosulfan
cadmium
copper
Vertisol
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Summary:In Burkina Faso, significant amounts of endosulfan are applied to cotton fields; in addition, urban vegetable agriculture is often characterised by high fertiliser inputs, such as urban solid wastes containing heavy metals （e.g., Cu and Cd）. Thus, the relevance of surrounding cotton and urban vegetable plots with vetiver （Vetiveria zizanioides） hedges to reduce environmental pollution by micropollutants was investigated using a leaching experiment, with outdoor lysimeters filled with two representative agricultural soils of Burkina Faso： Vertisol and Lixisol. After 6 months, little Cu was found in the leachates （〈 0.010% of the applied amount） due to its high adsorption coefficient and its tendency to remain at the soil surface. Despite leachate and bromide recoveries being greater in soils planted with vetiver grass than in the bare soils, smaller amounts of endosulfan and Cd were found in the effluents from the planted soils （0.01% to 0.70% of the applied amount） than in those from the bare soils （0.01% to 1.48% of the applied amount）, in agreement with their adsorption coefficients. These results may also be explained by a greater degradation of endosulfan in planted soils compared to bare soils and the absorption of Cd by vetiver. Thus, vetiver may decrease the risk of groundwater contamination, especially for Cd and endosulfan, which are more mobile than Cu. In addition, despite the smaller amounts of endosulfan and Cd measured in the Vertisol leachates （0.01% and 0.04~ of the applied amount, respectively） compared to the Lixisol leachates, vetiver was more effective in decreasing the leaching of micropollutants if planted on Lixisol rather than on Vertisol. Further field monitoring is necessary to demonstrate the effectiveness of vetiver under the climatic conditions of Burkina Faso.
Bibliography:cadmium, copper, endosulfan, Lixisol, lysimeter, transfer, Vertisol
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In Burkina Faso, significant amounts of endosulfan are applied to cotton fields; in addition, urban vegetable agriculture is often characterised by high fertiliser inputs, such as urban solid wastes containing heavy metals （e.g., Cu and Cd）. Thus, the relevance of surrounding cotton and urban vegetable plots with vetiver （Vetiveria zizanioides） hedges to reduce environmental pollution by micropollutants was investigated using a leaching experiment, with outdoor lysimeters filled with two representative agricultural soils of Burkina Faso： Vertisol and Lixisol. After 6 months, little Cu was found in the leachates （〈 0.010% of the applied amount） due to its high adsorption coefficient and its tendency to remain at the soil surface. Despite leachate and bromide recoveries being greater in soils planted with vetiver grass than in the bare soils, smaller amounts of endosulfan and Cd were found in the effluents from the planted soils （0.01% to 0.70% of the applied amount） than in those from the bare soils （0.01% to 1.48% of the applied amount）, in agreement with their adsorption coefficients. These results may also be explained by a greater degradation of endosulfan in planted soils compared to bare soils and the absorption of Cd by vetiver. Thus, vetiver may decrease the risk of groundwater contamination, especially for Cd and endosulfan, which are more mobile than Cu. In addition, despite the smaller amounts of endosulfan and Cd measured in the Vertisol leachates （0.01% and 0.04~ of the applied amount, respectively） compared to the Lixisol leachates, vetiver was more effective in decreasing the leaching of micropollutants if planted on Lixisol rather than on Vertisol. Further field monitoring is necessary to demonstrate the effectiveness of vetiver under the climatic conditions of Burkina Faso.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1002-0160
2210-5107
DOI:10.1016/S1002-0160(15)60062-5