Field controlled experiments of mercury accumulation in crops from air and soil

Niu, Zhenchuan; Zhang, Xiaoshan; Wang, Zhangwei; Ci, Zhijia

doi:10.1016/j.envpol.2011.05.029

Cited by 50 publications

(41 citation statements)

References 33 publications

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“…The author concluded that Hg in crop foliages was found mainly from air. Hg concentrations in roots were generally correlated with soil Hg concentrations (p < 0.05) but insignificantly correlated with air Hg concentrations, indicating that Hg in crop roots was mainly from soil (Niu et al, 2011). Mercury treatment at all concentration decreased seed germination, root length and seedling dry weight of V. radiata (Fig.2).…”

Section: Resultsmentioning

confidence: 99%

Effect of Mercury on Seed Germination and Seedling Growth of Mungbean (<i>Vigna radiata</i> (L.) Wilczek)

Muhammad¹,

Maria²,

Mohammad³

et al. 2015

Journal of Applied Sciences and Environmental Management

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Among the toxic elements release in the environment, mercury is considered highly toxic to the growth of plants. The present studies report the effects of different concentrations (1, 3, 5 and 7 mM) of mercury on seed germination and seedling growth performance of mungbea (Vigna radiata) as compared to control. Mercury treatment in the form of mercuric chloride at 1 mM did not show significant reduction in seed germination of V. radiata as compared to control. Increase in concentration of mercury to 3 mM produced significant (p<0.05) reduction in seed germination. Mercury treatment at 7 mM-produced significant (p<0.05) reduction in seedling and root length of the plants. The increase in concentration of mercury treatment at 7 mM was found sufficient to cause significant reductions in seedling dry weight of as compared to control. Mercury treatment at all concentrations decreased seed germination, shoot, and root length and seedling dry weight. Increase in mercury concentration upto 7 mM showed highest percentage of decrease in seed germination (42%), seedling length (70%), root length (66%) and seedling dry weight (47%) of mungbean as relation to control. V. radiata were more sensitive to mercury stress in seedling growth and root elongation than seed germination. The seedlings of V. radiata showed greater tolerance to mercury at 1 mM (85.83 %) and lowest at 7 mM (34.13%). These results show that there is a negative effect towards germination and growth of mungbean by mercury treatment. Minimum use of the mercury containing compounds in fungicide, pesticide and nematicide is recommended. Special care should be taken to monitor the toxic pollutants available in the immediate environment. The accumulation of such types of toxic pollutants in larger concentrations by crop can produce harmful effects to crops and ecosystem as well. © JASEM http://dx

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Section: Resultsmentioning

confidence: 99%

Effect of Mercury on Seed Germination and Seedling Growth of Mungbean (<i>Vigna radiata</i> (L.) Wilczek)

Muhammad¹,

Maria²,

Mohammad³

et al. 2015

Journal of Applied Sciences and Environmental Management

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“…Hg concentration in foliage is generally influenced by the level of ambient air Hg 0 (Ericksen et al, 2003;Frescholtz et al, 2003;Ericksen and Gustin, 2004;Millhollen et al, 2006a;Fay and Gustin, 2007a;Niu et al, 2011). Climate factors (e.g., solar irradiation, temperature), biological factors (e.g., leaf age, plant species) and ambient air components (e.g., CO 2 ) also significantly influence foliar Hg 0 flux (Rea et al, 2002;Millhollen et al, 2006a, b;Fay and Gustin, 2007a;Bushey et al, 2008;Stamenkovic and Gustin, 2009;Rutter et al, 2011a).…”

Section: Air-vegetation Hg 0 Exchangementioning

confidence: 99%

Global observations and modeling of atmosphere–surface exchange of elemental mercury: a critical review

et al. 2016

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Abstract. Reliable quantification of air-surface fluxes of elemental Hg vapor (Hg 0 ) is crucial for understanding mercury (Hg) global biogeochemical cycles. There have been extensive measurements and modeling efforts devoted to estimating the exchange fluxes between the atmosphere and various surfaces (e.g., soil, canopies, water, snow, etc.) in the past three decades. However, large uncertainties remain due to the complexity of Hg 0 bidirectional exchange, limitations of flux quantification techniques and challenges in model parameterization. In this study, we provide a critical review on the state of science in the atmosphere-surface exchange of Hg 0 . Specifically, the advancement of flux quantification techniques, mechanisms in driving the air-surface Hg exchange and modeling efforts are presented. Due to the semi-volatile nature of Hg 0 and redox transformation of Hg in environmental media, Hg deposition and evasion are influenced by multiple environmental variables including seasonality, vegetative coverage and its life cycle, temperature, light, moisture, atmospheric turbulence and the presence of reactants (e.g., O 3 , radicals, etc.). However, the effects of these processes on flux have not been fundamentally and quantitatively determined, which limits the accuracy of flux modeling.We compile an up-to-date global observational flux database and discuss the implication of flux data on the global Hg budget. Mean Hg 0 fluxes obtained by micrometeorological measurements do not appear to be significantly greater than the fluxes measured by dynamic flux chamber methods over unpolluted surfaces (p = 0.16, one-tailed, Mann-Whitney U test). The spatiotemporal coverage of existing Hg 0 flux measurements is highly heterogeneous with large data gaps existing in multiple continents (Africa, South Asia, Middle East, South America and Australia). The magnitude of the evasion flux is strongly enhanced by human activities, particularly at contaminated sites. Hg 0 flux observations in East Asia are comparatively larger in magnitude than the rest of the world, suggesting substantial re-emission of previously deposited mercury from anthropogenic sources. The Hg 0 exchange over pristine surfaces (e.g., background soil and water) and vegetation needs better constraints for global analyses of the atmospheric Hg budget. The existing knowledge gap and the associated research needs for future measurements and modeling efforts for the air-surface exchange of Hg 0 are discussed.

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“…Significant correlations were found between concentrations of total mercury and MeHg in rice plants and Hg levels in soils (Meng et al, 2014). Hg concentrations in wheat foliage were significantly correlated with Hg in air but not with Hg in soil, indicating that Hg in crop foliage was mainly from the air (Niu et al, 2011). It remains uncertain whether the primary source of mercury in plants is from the atmosphere or soil (Meng et al, 2014;Niu et al, 2011;Patra and Sharma, 2000).…”

Section: Introductionmentioning

confidence: 96%

“…It remains uncertain whether the primary source of mercury in plants is from the atmosphere or soil (Meng et al, 2014;Niu et al, 2011;Patra and Sharma, 2000). This poses a key question in the cycling of Hg concerning which sources contribute most significantly to Hg accumulation in plants (Ericksen et al, 2003;Niu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Accumulation, transfer, and potential sources of mercury in the soil-wheat system under field conditions over the Loess Plateau, northwest China

Wang

Zhang

Prete

et al. 2016

Science of The Total Environment

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Field controlled experiments of mercury accumulation in crops from air and soil

Cited by 50 publications

References 33 publications

Effect of Mercury on Seed Germination and Seedling Growth of Mungbean (<i>Vigna radiata</i> (L.) Wilczek)

Effect of Mercury on Seed Germination and Seedling Growth of Mungbean (<i>Vigna radiata</i> (L.) Wilczek)

Global observations and modeling of atmosphere–surface exchange of elemental mercury: a critical review

Accumulation, transfer, and potential sources of mercury in the soil-wheat system under field conditions over the Loess Plateau, northwest China

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