Accumulation of Heavy Metals by Wetland Plants with Different Root Systems in a Karst Mountainous Area

Wang, Yi; Huang, Xianfei; Hu, Ji Wei; Xiong, Kangning; Duan, Su Ming

doi:10.4028/www.scientific.net/amr.788.460

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The extensive root networks of trees and understory plants facilitate efficient nutrient uptake, including nitrogen, from the soil. The deeper root systems enable access to deeper soil layers where nitrogen may be more abundant, enhancing nitrogen absorption and accumulation in the soil [31]. Furthermore, the forest environment provides favorable conditions for the proliferation of soil microorganisms.…”

Section: Soil Nitrogenmentioning

confidence: 99%

Effects of Heavy Metals on Nitrogen in Soils of Different Ecosystems in the Karst Desertification of South China

Zhang

Xiong

Wan

2023

Forests

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Nitrogen, as a crucial limiting nutrient in terrestrial ecosystems, plays a vital role in determining land quality. Heavy metals, as drivers of soil substance transformation, are important indicators for assessing ecosystem function. Currently, the relationship between soil nitrogen and heavy metals in karst desertification areas remains unclear. Therefore, this study focuses on the soil of grassland, forest, and agroforestry ecosystems in a karst desertification area to investigate the relationship between heavy metals and nitrogen distribution using ecological stoichiometry. The findings revealed the following: (i) Total nitrogen (TN) and available nitrogen (AN) exhibited the trend of agroforestry * > forest > grassland, while soil microbial biomass nitrogen (SMBN) showed the trend of forest * > grassland * >> agroforestry; (ii) Chromium (Cr), Ferrum (Fe), Niccolum (Ni), and Plumbum (Pb) showed the trend of agroforestry * > grassland > forest, while Cuprum (Cu) demonstrated the trend of agroforestry > grassland > forest, and Zincum (Zn) exhibited the trend of grassland > forest * >> agroforestry. The Nemerow comprehensive pollution index were 0.77 for grassland, 0.69 for forest, and 0.94 for agroforestry; (iii) The sensitivity of soil nitrogen and heavy metals ranked as grassland > agroforestry > forest. The research findings aim to provide a scientific reference for karst desertification control, ecological protection and restoration, and enhancement of ecosystem function.

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Section: Soil Nitrogenmentioning

confidence: 99%

Effects of Heavy Metals on Nitrogen in Soils of Different Ecosystems in the Karst Desertification of South China

Zhang

Xiong

Wan

2023

Forests

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“…Among various properties, pH value is an important factor affecting the bioavailability of soil bound heavy metals ( Zhang et al, 2021 ). To solve the major practical problems including hostile environment and hindered agricultural production caused by soil heavy metal pollution, a lot of studies focused on the migration and enrichment of heavy metal pollutants in soil ( Yao et al, 2021 ; Li, Jin & Gu, 2011 ; Wang et al, 2013 ) as well as the treatment of heavy metal contaminated soil with phytoremediation technology ( Zhou et al, 2022 ; He et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of vegetation restoration on distribution characteristics of heavy metals in soil in Karst plateau area of Guizhou

Tian

Wang

et al. 2023

PeerJ

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In southwest China, vegetation restoration is widely used in karst rocky desertification control projects. This technology can effectively fix the easily lost soil, gradually restore the plant community and improve soil fertility. However, the change law of soil heavy metals in the restoration process remains to be further studied. Therefore, in this work, Guizhou Caohai Nature Reserve as a typical karst area was taken as the research object to investigate the influence of vegetation restoration technology on repairing soil heavy metal pollution. The spatial distribution characteristics of soil heavy metals (chromium, nickel, arsenic, zinc, lead) before and after vegetation restoration in karst area were studied by comparative analysis and linear stepwise regression analysis. The main influencing factors and spatial distribution characteristics of heavy metals in karst area were further discussed. The results showed that: (1) heavy metals in karst soils are affected by surface vegetation, root exudates, microorganisms and leaching. Only heavy metals nickel (Ni) and lead (Pb) showed the tendency of surface enrichment and bottom precipitation enrichment in non-karst soils. Path analysis suggested that non-metallic soil factors such as soil bulk density (BD), total nitrogen (TN) and ammonium nitrogen (NH4+-N) had direct effect on the content of heavy metals in soil. (2) The proportion of 0.25–2 mm aggregates in the surface soil of vegetation restoration belt was more than 40%, and the proportion of surface soil ≤2 mm aggregates in this increased to 83% and 88%, respectively, which could improve the soil structure and properties effectively. (3) Vegetation restoration effectively restored the nutrient elements such as carbon and nitrogen in the soil, and enhanced the soil material circulation. Furthermore the content of heavy metals in the surface soil higher than that in the 10–20 cm soil layer. Plant absorption, biosorption mechanism of microorganisms, coupling of root exudates, dissolution of soil soluble organic carbon and pH make the contents of heavy metals Cr, Ni and Pb in vegetation restoration belt slightly lower than those in karst soil. At the same time, affected by vegetation coverage, residual heavy metals in soil are further leached by surface runoff. Therefore, the content of heavy metals in soil could reduce combined heavy metal enrichment plants for extraction with remediation. This study elucidates the advantages and remedy mechanism of vegetation restoration in the remediation of heavy metal contaminated soils in Caohai area of Guizhou, and this plant activation and enrichment extraction remediation technology would be popularized and applied in the remediation of heavy metal contaminated soils in other karst areas.

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Designing a biochar-based pretreatment method for distillery effluents entering constructed wetlands

Cakin,

Pap,

Gaffney

et al. 2024

Journal of Cleaner Production

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Accumulation of Heavy Metals by Wetland Plants with Different Root Systems in a Karst Mountainous Area

Cited by 3 publications

References 9 publications

Effects of Heavy Metals on Nitrogen in Soils of Different Ecosystems in the Karst Desertification of South China

Effects of Heavy Metals on Nitrogen in Soils of Different Ecosystems in the Karst Desertification of South China

Effects of vegetation restoration on distribution characteristics of heavy metals in soil in Karst plateau area of Guizhou

Designing a biochar-based pretreatment method for distillery effluents entering constructed wetlands

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