Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Arsenic removal from flooded paddy soil with spontaneous hygrophyte markedly attenuates rice grain arsenic
Abstract China ranks the top in global annual rice output. However, extensive mining and smelting has led to elevated arsenic (As) in paddy soils, potentially imperiling local population health and sustainable rice production in the country. Under flooded condition, reductive As mobilization generally occurs, providing a unique advantage for soil As removal. In this study, we explore the depletion magnitude of labile As from paddy soils through cycling of flooding-drainage with three distinct co-strategies, i.e. (1) no soil disturbance with spontaneously established hygrophyte plants, (2) selective fertilization to enhance soil As release, and (3) soil ploughing following each drainage. After 151 days of flooding with periodic drainage, diffusive gradients in thin film (DGT)-labile As through 0–14 cm soil profile with hygrophyte plants growing decreased from initial 292 μg l−1 to well below the required threshold level (57–77 μg l−1) for safe rice production. Correspondingly, an average of 22.9% of total soil As was removed, with up to 76.7% of As bound to amorphous Fe hydroxides being stripped in this treatment. In the following rice cultivation, inorganic As in the polished rice from the naturally vegetated treatment (0.15 mg kg−1) fell successfully below the Chinese food safety standard (0.2 mg kg−1). The results highlight that As removal from paddy soils with native hygrophyte under shallow flooded condition can decrease soil bioavailable As specifically to safe levels within a relatively short period, and thus provides a novel and quite cost-effective pathway securing rice production.
Graphical abstract Display Omitted
Highlights Arsenic accumulation in paddy rice grain poses a global health risk. Elevated As mobilization by flooding provides a unique advantage for soil As removal. Native hygrophyte inhabited quickly the paddy soil under shallow flooded condition. 123-d growth of hygrophyte markedly decreased rice As to lower than national standard. Soil As depletion with hygrophyte is a cost-effective pathway securing rice production.
Arsenic removal from flooded paddy soil with spontaneous hygrophyte markedly attenuates rice grain arsenic
Abstract China ranks the top in global annual rice output. However, extensive mining and smelting has led to elevated arsenic (As) in paddy soils, potentially imperiling local population health and sustainable rice production in the country. Under flooded condition, reductive As mobilization generally occurs, providing a unique advantage for soil As removal. In this study, we explore the depletion magnitude of labile As from paddy soils through cycling of flooding-drainage with three distinct co-strategies, i.e. (1) no soil disturbance with spontaneously established hygrophyte plants, (2) selective fertilization to enhance soil As release, and (3) soil ploughing following each drainage. After 151 days of flooding with periodic drainage, diffusive gradients in thin film (DGT)-labile As through 0–14 cm soil profile with hygrophyte plants growing decreased from initial 292 μg l−1 to well below the required threshold level (57–77 μg l−1) for safe rice production. Correspondingly, an average of 22.9% of total soil As was removed, with up to 76.7% of As bound to amorphous Fe hydroxides being stripped in this treatment. In the following rice cultivation, inorganic As in the polished rice from the naturally vegetated treatment (0.15 mg kg−1) fell successfully below the Chinese food safety standard (0.2 mg kg−1). The results highlight that As removal from paddy soils with native hygrophyte under shallow flooded condition can decrease soil bioavailable As specifically to safe levels within a relatively short period, and thus provides a novel and quite cost-effective pathway securing rice production.
Graphical abstract Display Omitted
Highlights Arsenic accumulation in paddy rice grain poses a global health risk. Elevated As mobilization by flooding provides a unique advantage for soil As removal. Native hygrophyte inhabited quickly the paddy soil under shallow flooded condition. 123-d growth of hygrophyte markedly decreased rice As to lower than national standard. Soil As depletion with hygrophyte is a cost-effective pathway securing rice production.
Arsenic removal from flooded paddy soil with spontaneous hygrophyte markedly attenuates rice grain arsenic
Wang, Xin (Autor:in) / Huang, Rui (Autor:in) / Li, Liang (Autor:in) / He, Sixue (Autor:in) / Yan, Lu (Autor:in) / Wang, Hao (Autor:in) / Wu, Xin (Autor:in) / Yin, Yulong (Autor:in) / Xing, Baoshan (Autor:in)
04.09.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| DOAJ | 2019
| DOAJ | 2015