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Agromine associant plantes hyperaccumulatrice de nickel et légumineuse, comme service écosystémique des sols ultramafiques

Abstract : The application of agromining to abandoned ultramafic areas is a major challenge in the presence of potentially recoverable areas. Howerver, ultramafic soils are particular in terms of their fertility with high concentrations of metals and a near absence of organic matter. Nevertheless, this challenge was partly met by the application of chemical fertilizers and herbicides. Our challenge, through this PhD, was to develop a sustainable agro-ecosystem based on the introduction of a legume in association with the hyperaccumulating plant and then the reduction of any chemical input. Our results clearly confirmed that the introduction of a legume into these new cropping systems improved both the biomass production of Alyssum murale and the Ni yields in comparison to the fertilized and non-fertilized monoculture. Our work has also shown that the insertion of a legume into agromining cropping systems improves the structure of the soil due to stable and larger aggregates. In addition, higher levels of carbon and nitrogen and higher concentrations of organic matter were detected. These results led to an overall improvement of the soil structure, its fertility and its biofunctioning. Our results showed positive effects of these new cropping systems, both on the size of the bacterial communities and on the microbial enzymes involved in the soil biogeochemical cycles. In addition, the structure and diversity of bacterial communities were modified with the insertion of the legume, compared to the monoculture. Economically, the introduction of legume into cropping systems dedicated to Ni agromining involves a gain of money and time due to reduced application of mineral fertilizers as well as products of phytosanitary. Finally, all these benefits lead to the rehabilitation of ultramafic soils with the restoration of their physical, chemical and biological qualities while allowing these particular soils to offer many ecosystem services
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https://tel.archives-ouvertes.fr/tel-01827539
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Submitted on : Monday, July 2, 2018 - 2:27:07 PM
Last modification on : Tuesday, March 17, 2020 - 3:13:57 AM
Long-term archiving on: : Monday, October 1, 2018 - 11:00:04 AM

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  • HAL Id : tel-01827539, version 1

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Ramez Saad. Agromine associant plantes hyperaccumulatrice de nickel et légumineuse, comme service écosystémique des sols ultramafiques. Agronomie. Université de Lorraine; Université libanaise, 2017. Français. ⟨NNT : 2017LORR0155⟩. ⟨tel-01827539⟩

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