Effects of decapitated and root-pruned Sedum alfredii on the characterization of dissolved organic matter and enzymatic activity in rhizosphere soil during Cd phytoremediation

Niu, Hong; Wu, Hang; Chen, Ke; Sun, Jutang; Cao, Min; Luo, Jie

doi:10.1016/j.jhazmat.2021.125977

Cited by 16 publications

(5 citation statements)

References 61 publications

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“…These interactions help to create a suitable environment for microbial development, increasing rhizodegradation and microbial degradation processes (Reilley et al, 1996;Epelde et al, 2009;Stefanowicz et al, 2012;Nui et al, 2021;Gómez-Sagasti et al, 2021). Different authors (Park et al, 2011;Niu et al, 2021) have already reported that plants can influence metal uptake and/or immobilization through different interactions in the rhizosphere. However, plant growth was not the unique factor to be taken into consideration regarding pollutants toxicity.…”

Section: Discussionmentioning

confidence: 99%

Integrative assessment of in situ combined bioremediation strategies applied to remediate soils spilled with sewage sludges

Pérez-Vázquez,

Urionabarrenetxea,

Artetxe

et al. 2024

Front. Environ. Sci.

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Landfills and waste disposal sites in the Basque Country are summarized in the inventory of soils that either currently support or have supported potentially polluting activities or facilities (Law 4/2015). Notably, “Landfill 17,” located in Gernika-Lumo, has been receiving, for decades, sewage sludges from the local wastewater treatment plant (WWTP) as agricultural amendment. In order to decontaminate and recover soil functionality, a combination of bioremediation (which involved bioagumentation and phyto- and vermitechnologies) and complementary bioremediation strategy (i.e., promotion and maintenance of the native vegetation) was implemented in situ. Physicochemical and ecotoxicological characterization were achieved. Furthermore, an ecotoxicological assessment of the soils upon flora and fauna was carried out through the application of different bioassays and biomarkers. Additionally, an integrative biomarker response (IBR/n) index was calculated to provide a holistic view of the soil general status. Critical pollutants [Cd, Cr, Ni, Pb, benzo(a)pyrene, and dieldrin] were observed in most of the treated sites. Microbial parameters did not present remarkable differences among sites. However, plant indicators pointed the non-treated site (MN8) as the unhealthiest. This was also observed in earthworms’ immune system, where cytotoxicity appears when exposed to non-treated soils. In conclusion, this field study showed that the combination of bioaugmentation, phytoremediation with native species, and vermiremediation is highly useful in eliminating mixed contamination, improving soil health, and ultimately restoring ecosystem functionality and biodiversity.

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Section: Discussionmentioning

confidence: 99%

Integrative assessment of in situ combined bioremediation strategies applied to remediate soils spilled with sewage sludges

Pérez-Vázquez,

Urionabarrenetxea,

Artetxe

et al. 2024

Front. Environ. Sci.

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“…A comparison of the soil nutrients among the different layers showed that the nutrients in the shallow soil were greater than those in the deep soil. The abundant plant litter on the forest land topsoil decomposes to structurally diverse organic matter, which is a major source of SMC ( Niu et al, 2021 ). Additionally, the death metabolism of the roots and the secretion from the roots are also sources of SOM ( Wang, Fang & Chen, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

Relationship between the roots of Hippophae rhamnoides at different stump heights and the root microenvironment in feldspathic sandstone areas

Liu

Guo

Liu

et al. 2023

PeerJ

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Background To solve the withering of Hippophae rhamnoides plantation in the feldspathic sandstone areas of Inner Mongolia and to promote the regeneration, rejuvenation, and sustainability of H. rhamnoides forests. Methods We stumped aging H. rhamnoides trees at the ground heights of 0, 10, 15, and 20 cm (S1, S2, S3, and S4, respectively) and utilized unstumped trees as the control (CK). We then analyzed the effects of the different stump heights on the roots and the root microenvironment of H. rhamnoides and the relationship between the roots and the root microenvironment in the stumped H. rhamnoides. Results The root fractal features, root branching rate, root length, root soluble proteins, soil moisture content, and soil nutrients among the different treatments were ranked as S3>S2>S1>S4>CK (P < 0.05). The root topological index, root proline, and malondialdehyde among the different treatments were ranked as S3<S2<S1<S4<CK (P < 0.05). The topological indices of S1, S2, S3, S4, and CK were 0.80, 0.86, 0.89, 0.94, and 0.98, respectively, and all were near 1. This result indicated a typical fishtail-shaped branching structure. The root length and root fractal dimensions were primarily affected by the positive correlation of the soil moisture content and the soil organic matter, and the root topological index was primarily affected by the negative correlation of the root proline. Root nutrients were dominant in the changes in the root architecture, while soil moisture and nutrients played supporting roles. These results indicated that stumping can promote plant root growth and root nutrient accumulation, thereby improving soil moisture and the soil nutrient distribution, and the S3 treatment had the greatest impact on the H. rhamnoides roots and root microenvironment. Therefore, the 15 cm stump height treatment should be implemented for withering H. rhamnoides in feldspathic sandstone areas to promote vegetation restoration.

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“…At present, the detoxification mechanisms of hyperaccumulators to heavy metals generally include the chelation of heavy metals by cytoplasmic substances, the repair of stress damage and the compartmentalization of vacuolar ( Hall, 2002 ), but the detoxification mechanisms need to be further explored. Moreover, plants such as Viola baoshanensis ( Shu et al., 2019 ), Sedum alfredii ( Chen et al., 2020 ; Niu et al., 2021 ), Leersia hexandra Swartz ( Liu et al., 2011 ), and Pteris vittata ( Han et al., 2022 ) have the ability to repair heavy metal pollution, but few studies have been done on their specific regulatory mechanisms. The response mechanism of plants to heavy metals is complex, so we should deeply study the uptake, translocation, chelation and other mechanisms of super enriched plants to further promote the development of phytoremediation.…”

Section: New Technologies For Developing Synthetic Biology Modulesmentioning

confidence: 99%

Shoot-root signal circuit: Phytoremediation of heavy metal contaminated soil

2023

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High concentrations of heavy metals in the environment will cause serious harm to ecosystems and human health. It is urgent to develop effective methods to control soil heavy metal pollution. Phytoremediation has advantages and potential for soil heavy metal pollution control. However, the current hyperaccumulators have the disadvantages of poor environmental adaptability, single enrichment species and small biomass. Based on the concept of modularity, synthetic biology makes it possible to design a wide range of organisms. In this paper, a comprehensive strategy of “microbial biosensor detection - phytoremediation - heavy metal recovery” for soil heavy metal pollution control was proposed, and the required steps were modified by using synthetic biology methods. This paper summarizes the new experimental methods that promote the discovery of synthetic biological elements and the construction of circuits, and combs the methods of producing transgenic plants to facilitate the transformation of constructed synthetic biological vectors. Finally, the problems that should be paid more attention to in the remediation of soil heavy metal pollution based on synthetic biology were discussed.

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Effects of decapitated and root-pruned Sedum alfredii on the characterization of dissolved organic matter and enzymatic activity in rhizosphere soil during Cd phytoremediation

Cited by 16 publications

References 61 publications

Integrative assessment of in situ combined bioremediation strategies applied to remediate soils spilled with sewage sludges

Integrative assessment of in situ combined bioremediation strategies applied to remediate soils spilled with sewage sludges

Relationship between the roots of Hippophae rhamnoides at different stump heights and the root microenvironment in feldspathic sandstone areas

Shoot-root signal circuit: Phytoremediation of heavy metal contaminated soil

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