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Agronomic fertility of dam sediment for soil construction in urban greening

Abstract : There is today a growing demand to develop green spaces in city, as they provide asupport for biodiversity and can contribute to ecological connectivity with surroundings.Greening urban areas requires large amounts of arable soil that is a non-renewable resource.The purpose of our study is to determine whether river dam sediments can be used as alter-native materials to preserve soil resource. Indeed, sediments are natural materials comingmainly from soils erosion available in large volumes (several hundred thousand cubic meterseach year in France coming from EDF hydraulic power installations).We studied four sediments coming from four hydroelectric plant dams showing differences intexture, mineral composition and initial organic matter content, that were compared withan agricultural loam soil. The sediments and the control soil were used alone or mixedwith green waste compost. Each substrate was put into individual instrumented lysimeters(350L) in July 2015 sown withLolium perenneand placed under natural outdoor conditionsover a three-year period. Experiments in greenhouse under controlled conditions were alsoconducted to understand fine process.In both experiments following parameters were measured:Physical properties: aggregate stability, bulk density, hydraulic conductivity at saturation,porosity; chemical properties: pH, CEC, organic matter content, nutriments contents; bio-logical properties: potential of mineralization of C, microbial and fungal biomasses, plantbiomasses.First results show that after six month, all sediments with or without compost favored plantdevelopment with differences in grass development depending on the sediments properties.Compost addition seems improve micro-organism performance in substrates.
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Submitted on : Monday, February 10, 2020 - 5:25:39 PM
Last modification on : Monday, July 6, 2020 - 3:38:30 PM

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  • HAL Id : hal-02469319, version 1

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Gaëtan Fourvel, Thagshayini Kumarasamy, Laure Vidal Beaudet, Patrice Cannavo, Laurent Eisenlohr, et al.. Agronomic fertility of dam sediment for soil construction in urban greening. Sfécologie, Oct 2016, Marseille, France. ⟨hal-02469319⟩

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