Remediation of cadmium-contaminated coastal saline-alkaline soil by Spartina alterniflora derived biochar

Cai, Jing-Fang; Zhang, Li; Zhang, Yu; Zhang, Mingxiang; Li, Hongli; Xia, Huijuan; Kong, Weijing; Yu, Fei‐Hai

doi:10.1016/j.ecoenv.2020.111172

Cited by 29 publications

(5 citation statements)

References 52 publications

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“…This result indicates that increasing planting density might decrease the Cd uptake efficiency, although the biomass significantly increased. Overall, our results indicate that biochar application can largely promote the Cd uptake of T. repens population, which have been found in many previous studies ( Wang et al., 2019 ; Cai et al., 2020 ; Tu et al., 2020 ; Xiao et al., 2020b ), however, this promotion in the present study depends on the planting density. Generally, rhizobium could fix and provide large amount of the nitrogen nutrients to T. repens , and poor nitrogen nutrients in soil could promote the nitrogen fixation ( Hoglund and Brock, 1987 ).…”

Section: Discussionsupporting

confidence: 85%

“…The biochar with its large specific surface area, great porous structure, active functional groups and high cation exchange capacity has been widely used to adsorb heavy metals in soils and water environment ( Narayanan et al., 2021 ; Chen et al., 2022 ; Gao et al., 2022 ; Issaka et al., 2022 ). For instance, many studies indicated that biochar could effectively immobilize Cd in soils by reducing the mobility and bioavailability, through high polarity and/or abundant chemical functional groups, e.g., hydroxyl, carboxyl, phenolic groups, and π electron-rich domain on the aromatic structures ( Cai et al., 2020 ; Tu et al., 2020 ). These groups give biochar the property of high polarity, thus increasing the interaction between Cd and biochar, resulting in an increase of Cd immobilization ( Sumaraj & Padhye, 2017 ; Wang R. et al., 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Effects of biochar application and nutrient fluctuation on the growth, and cadmium and nutrient uptake of Trifolium repens with different planting densities in Cd-contaminated soils

Zheng,

Wang,

et al. 2023

Front. Plant Sci.

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Biochar has been used to remediate contaminated-soil with heavy metals, however, less is known on how biochar interacts with planting density and nutrient fluctuation to affect the remediation. A pot experiment was conducted in the greenhouse to investigate the effects of biochar application (without vs. with 1% biochar, g/g substrate), nutrient fluctuation (constant vs. pulsed) and planting density (1-, 3- and 6-individuals per pot) on the growth, and cadmium (Cd) and nutrient uptake of Trifolium repens population. Our results found that the growth of T. repens population increased significantly with increasing planting density, and the increment decreased with increasing planting density. Both the Cd and nutrient uptake were higher at higher planting density (e.g., 3- and 6-individuals) than at lower planting density (e.g., 1-individual). Biochar application increased the biomass and shoot Cd uptake, but decreased the ratio of root to shoot and root Cd uptake of T. repens population, the effects of which were significantly influenced by planting density. Although nutrient fluctuation had no effect on the growth of T. repens population, but its interaction with planting density had significant effects on Cd uptake in tissues. Overall, the effects of biochar application and nutrient fluctuation on the growth and Cd uptake were both influenced by planting density in the present study. Our findings highlight that biochar application and constant nutrient supply at an appropriate planting density, such as planting density of 3-individuals per pot in the present study, could promote the growth, and Cd and nutrient uptake of T. repens population.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Effects of biochar application and nutrient fluctuation on the growth, and cadmium and nutrient uptake of Trifolium repens with different planting densities in Cd-contaminated soils

Zheng,

Wang,

et al. 2023

Front. Plant Sci.

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“…S. alterniflora is an alien invasive plant in China with strong adaptability, fast reproduction, spreading capabilities and high resistance to salinity [36], which can displace native species, thereby threatening local biodiversity [37] and damaging the natural ecosystems and coastal aquaculture, therefore causing direct economic losses for China [38]. However, S. alterniflora as a plant can serve as a resource, and previous studies have reported that the transformation of S. alterniflora into biochar by pyrolysis can be applied in the remediation of heavy metal contamination [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Nanoparticles Loaded on Biochar Derived from Spartina alterniflora with Superior Photocatalytic Degradation Performance

Hua

Wang³

et al. 2021

Nanomaterials

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Spartina alterniflora is an invasive plant from coastal wetlands, and its use in applications has garnered much interest. In this study, a composite photocatalyst (ZnO@BC) was synthesized by preparing zinc oxide (ZnO) nanoparticles with S. alterniflora extracts, S. alterniflora, and one-step carbonization, which was characterized using scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Raman, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy (UV–vis DRS), photoluminescence (PL) and N2 adsorption–desorption isotherm. The degradation capacity and mechanism of malachite green (MG) using ZnO@BC were analyzed under visible irradiation, and the degradation products of malachite green were detected by LC–MS. The results show that ZnO@BC has a larger surface area (83.2 m2/g) and various reactive groups, which enhance its photocatalytic efficiency, with the presence of oxygen vacancy further improving the photocatalytic activity. The total removal rate of malachite green (400 mg/L) using ZnO@BC is up to 98.38%. From the LC–MS analysis, it could be concluded that malachite green is degraded by demethylation, deamination, conjugate structure and benzene ring structure destruction. This study provides a novel idea for the high-value utilization of S. alterniflora.

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“…As a result, this can help in reducing salt accumulation in the topsoil ( Yuan et al., 2023 ). However, it was observed that there was no significant change in soil salinity from CK for 3% SBC and 5% SBC treatments ( Figure 1B ), which could possibly be attributed to the fact that S. alterniflora is a halophyte ( Cai et al., 2020 ; Wang et al., 2024 ). Hence, to prevent soil salinization during the application of SBC, it is necessary to desalt before carbonizing S. alterniflora .…”

Section: Discussionmentioning

confidence: 94%

Biochar addition can negatively affect plant community performance when altering soil properties in saline-alkali wetlands

Wang,

He,

et al. 2024

Front. Plant Sci.

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Biochar is a widely proposed solution for improving degraded soil in coastal wetland ecosystems. However, the impacts of biochar addition on the soil and plant communities in the wetland remains largely unknown. In this study, we conducted a greenhouse experiment using soil seed bank from a coastal saline-alkaline wetland. Three types of biochar, including Juglans regia biochar (JBC), Spartina alterniflora biochar (SBC) and Flaveria bidentis biochar (FBC), were added to the saline-alkaline soil at ratios of 1%, 3% and 5% (w/w). Our findings revealed that biochar addition significantly increased soil pH, and increased available potassium (AK) by 3.74% - 170.91%, while reduced soil salinity (expect for 3% SBC and 5%SBC) by 28.08% - 46.93%. Among the different biochar types, the application of 5% FBC was found to be the most effective in increasing nutrients and reducing salinity. Furthermore, biochar addition generally resulted in a decrease of 7.27% - 90.94% in species abundance, 17.26% - 61.21% in community height, 12.28% - 56.42% in stem diameter, 55.34% - 90.11% in total biomass and 29.22% - 78.55% in root tissue density (RTD). In particular, such negative effects was the worst in the SBC samples. However, 3% and 5% SBC increased specific root length (SRL) by 177.89% and 265.65%, and specific root surface area (SRSA) by 477.02% and 286.57%, respectively. The findings suggested that the plant community performance was primarily affected by soil pH, salinity and nutrients levels. Furthermore, biochar addition also influenced species diversity and functional diversity, ultimately affecting ecosystem stability. Therefore, it is important to consider the negative findings indirectly indicate the ecological risks associated with biochar addition in coastal salt-alkaline soils. Furthermore, Spartina alterniflora was needed to desalt before carbonization to prevent soil salinization when using S. alterniflora biochar, as it is a halophyte.

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Remediation of cadmium-contaminated coastal saline-alkaline soil by Spartina alterniflora derived biochar

Cited by 29 publications

References 52 publications

Effects of biochar application and nutrient fluctuation on the growth, and cadmium and nutrient uptake of Trifolium repens with different planting densities in Cd-contaminated soils

Effects of biochar application and nutrient fluctuation on the growth, and cadmium and nutrient uptake of Trifolium repens with different planting densities in Cd-contaminated soils

Synthesis of ZnO Nanoparticles Loaded on Biochar Derived from Spartina alterniflora with Superior Photocatalytic Degradation Performance

Biochar addition can negatively affect plant community performance when altering soil properties in saline-alkali wetlands

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