RodriguezBrisson2016

Référence

Rodriguez, M. and Brisson, J. (2016) Does the combination of two plant species improve removal efficiency in treatment wetlands? Ecological Engineering, 91:302-309. (Scopus )

Résumé

We explored the effect of combining two plant species with complementary traits (Phragmites australis and Phalaris arundinacea), planted sequentially, on the performance of treatment wetlands (TWs). We performed a year-long experiment in mesocosm-scale TWs, aiming to answer the following question: will the combined removal efficiency of the two species equal the average efficiency of the separate monocultures, or will it outperform both monocultures, thus supporting the hypothesis that plant diversity improves pollutant removal in TWs? Root and shoot density and morphology particular to each plant species influenced the redox conditions of the rhizosphere; Phragmites rhizosphere oxidizing conditions enhanced nitrification and ammonification processes, while possibly limiting denitrification rate. On the other hand, Phalaris reducing conditions seemed to limit nitrification and enhance denitrification and sulfate reduction. Our results revealed that Phragmites was equal to or more efficient in removal than Phalaris for all pollutants except for nitrate. We found no evidence that combining both species would improve treatment efficiency for any pollutant taken individually, the best monoculture being always as efficient as or more efficient in removal than the combination of two plant species. However, combining both plant species may represent the best tradeoff between overall high pollutant removal and low nitrate level in the effluent. © 2016 Elsevier B.V.

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@ARTICLE { RodriguezBrisson2016,
    AUTHOR = { Rodriguez, M. and Brisson, J. },
    TITLE = { Does the combination of two plant species improve removal efficiency in treatment wetlands? },
    JOURNAL = { Ecological Engineering },
    YEAR = { 2016 },
    VOLUME = { 91 },
    PAGES = { 302-309 },
    NOTE = { cited By 0 },
    ABSTRACT = { We explored the effect of combining two plant species with complementary traits (Phragmites australis and Phalaris arundinacea), planted sequentially, on the performance of treatment wetlands (TWs). We performed a year-long experiment in mesocosm-scale TWs, aiming to answer the following question: will the combined removal efficiency of the two species equal the average efficiency of the separate monocultures, or will it outperform both monocultures, thus supporting the hypothesis that plant diversity improves pollutant removal in TWs? Root and shoot density and morphology particular to each plant species influenced the redox conditions of the rhizosphere; Phragmites rhizosphere oxidizing conditions enhanced nitrification and ammonification processes, while possibly limiting denitrification rate. On the other hand, Phalaris reducing conditions seemed to limit nitrification and enhance denitrification and sulfate reduction. Our results revealed that Phragmites was equal to or more efficient in removal than Phalaris for all pollutants except for nitrate. We found no evidence that combining both species would improve treatment efficiency for any pollutant taken individually, the best monoculture being always as efficient as or more efficient in removal than the combination of two plant species. However, combining both plant species may represent the best tradeoff between overall high pollutant removal and low nitrate level in the effluent. © 2016 Elsevier B.V. },
    AUTHOR_KEYWORDS = { Constructed wetlands; Monoculture; Phalaris arundinacea; Phragmites australis; Plant diversity; Polyculture },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.ecoleng.2016.02.047 },
    KEYWORDS = { Denitrification; Efficiency; Nitrates; Nitrification; Pollution; Soils; Storm sewers; Wetlands, Constructed wetlands; Monoculture; Phalaris arundinacea; Phragmites australis; Plant diversity; Poly cultures, Effluents, Phalaris; Phalaris arundinacea; Phragmites; Phragmites australis },
    SOURCE = { Scopus },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84960332166&partnerID=40&md5=3185dff0ca7a021850818b721fc212ac },
}

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