Effects of humic acid on transport and transformation of mercury in soil-plant systems

Wang, D. Y.; Chang-le, Qing; Guo, T. Y.; Guo, Y-J

doi:10.1007/bf02406154

Cited by 48 publications

(30 citation statements)

References 9 publications

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“…This is why we used bulk density, penetration resistance, shear resistance and soil porosity for measuring soil compaction. In agreement with the results of previous studies (Wang et al 1997, Williamson & Neilsen 2000, Wallbrink et al 2002, Han et al 2009), our findings showed that the investigated physical parameters of soil were significantly affected mainly by the first vehicle passes (comparison between Time 1 and Time 2). Further machine passes slightly increased or did not affect soil physical parameters.…”

Section: Discussionsupporting

confidence: 93%

Estimating machine impact on strip roads via close-range photogrammetry and soil parameters: a case study in central Italy

Cambi¹,

Giannetti²,

Bottalico³

et al. 2018

iForest

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Several studies have been carried out to investigate soil compaction and rutting after logging vehicle traffic, based on time consuming and punctual field measurements. The objective of this study was to measure soil disturbances with two methods: (i) a new, image-based models derived by a structure-frommotion (SfM) photogrammetry approach; and (ii) a traditional soil sampling (bulk density and shear strength). Two trails were selected in a logging area (central Italy), one trafficked by a forwarder (FT) and one trafficked by a skidder (ST). Data collection was conducted before, during and after timber extraction. Image-based models derived by SfM photogrammetry was used to highlight the differences in the shape and distribution of the disturbances along ST and FT. Results showed that the physical parameters of soil significantly changed due to both FT and ST traffic. Machine passes increased bulk density (111% and 31% for FT and ST, respectively), penetration resistance (29% and 24% for FT and ST, respectively) and shear resistance (14% and 6% for FT and ST, respectively), whereas porosity decreased (46% and 9% for FT and ST, respectively). Significant differences between FT and ST were found when comparing ruts removal and bulges with SfM photogrammetry. After logging, FT clearly showed ruts and bulges, whereas in ST ruts and bulges were not visible, but soil displacement in the direction of extraction was evident and measurable. Nevertheless, although our result shows a larger soil disturbance caused by forwarders than skidders, it is not possible to draw any general conclusions about differences between the two machines. Data about the machine passes, or the wood volumes transported over each trial area were not available; therefore, any general conclusion is misleading. SfM photogrammetry give information not available via traditional methods, thus improving impact assessment.

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Section: Discussionsupporting

confidence: 93%

Estimating machine impact on strip roads via close-range photogrammetry and soil parameters: a case study in central Italy

Cambi¹,

Giannetti²,

Bottalico³

et al. 2018

iForest

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“…Wang et al (1997) observed that the increase of humus in soils affects the decrease of Hg content in plants, which could indicate strong binding of this element by organic matter. Montgomery et al (2000), however, found relatively high concentration of mobile and available mercury forms in soils with comparatively high amount of organic matter.…”

Section: Mercury Bound To Organic Mattermentioning

confidence: 99%

“…High content of clay fraction and Fe o , which forms soil sorption complex, leads to binding of mercury by the solid phase of the soil (Boszke et al 2003;Dreher and Follmer 2004). This fact does not limit mercury bioavailability when soil shows low amount of organic matter (Biester et al 2002a;Wang et al 1997). The process of mercury binding by clay minerals has been observed in soils containing a minimum of 15 % of clay (Wang et al 1997).…”

Section: Content Of Bioavailable Mercurymentioning

confidence: 99%

“…This fact does not limit mercury bioavailability when soil shows low amount of organic matter (Biester et al 2002a;Wang et al 1997). The process of mercury binding by clay minerals has been observed in soils containing a minimum of 15 % of clay (Wang et al 1997).…”

Section: Content Of Bioavailable Mercurymentioning

confidence: 99%

“…Montgomery et al (2000), however, found relatively high concentration of mobile and available mercury forms in soils with comparatively high amount of organic matter. Furthermore, the influence of soil humus on binding of mercury is dependent on the clay content, and whether clay is high may even play the dominant role in this process (Inácio et al 1998;Wang et al 1997).…”

Section: Mercury Bound To Organic Mattermentioning

confidence: 99%

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Bioavailability and mobility of mercury in selected soil profiles

2016

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To understand the behaviour of mercury in soils and assess the risk of its toxicity, the forms in which the element is found in the environment must be detected. In the occurrence of favourable alkylation conditions (for example in floodplain soils), the content of methyl and ethyl mercury is higher. These Hg forms in comparison with mineral compounds are toxic for the same organisms in concentrations from 10 to 100 times lower. The research concerned eight selected soil profiles representing six different types of soils (Endogleyic Phaeozem, Endogleyic Fluvisol, Eutric Fluvisol, Haplic Luvisols, Brunic Arenosol, Albic Podzol) placed in croplands. The content of mobile (water soluble), available (DTPA-extractable) and bound with organic matter (NaOH-extractable) Hg forms was determined after thermal decomposition using AMA mercury analyser. The mobility as well as availability of mercury in the analysed soils was very low, with average percentage to 0.28 and 2.45 % of the total content of this metal, respectively. It was mainly dependent on texture, the amount of organic matter and soil pH. The percentage of mercury bound with organic matter ranged from 2.34 to 73.70 % of the total content of this metal and was correlated with amount of clay and Fe oxides. Considering these results, the hazard of migration of this element into deeper horizons of the soil profile and ground water is very low. Moreover, crops from the investigated area are not at risk from mercury contamination.

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Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling

Kwon

Selin

Giang

et al. 2018

Global Biogeochemical Cycles

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We construct a rice paddy biogeochemical cycle model to investigate processes governing rice mercury sources and to understand factors influencing spatiotemporal variability in Chinese rice mercury concentrations. The rice paddy model takes atmospheric mercury deposition, simulated from a global atmospheric chemistry transport model (GEOS‐Chem), and soil and irrigable surface water mercury concentrations obtained from literature and calculates rice inorganic (IHg) and methylmercury (MeHg) concentrations. We use ranges of GEOS‐Chem‐simulated future atmospheric mercury deposition—no policy and strict policy to regulate mercury emissions from Chinese coal‐fired power plants under the Minamata Convention on Mercury—to simulate future rice IHg and MeHg concentrations. Sensitivity analyses suggest that rice IHg and MeHg concentrations are more sensitive to the process of soil desorption than infiltration of recently introduced mercury (atmospheric and irrigation source). The rate of internal methylation via microbial activity has the largest modeled influence on rice MeHg concentration. We find that soil mercury, rather than atmospheric deposition, explains observed spatial variability in rice IHg and MeHg concentrations and captures locations of rice mercury hot spots (>20 ng/g; China National Standard Limit). Under our future scenarios, the Chinese median rice IHg and MeHg concentration increases by 13% and decrease by 18% under no policy and strict policy, respectively. Regions with the largest percentage decline in rice IHg and MeHg concentrations under strict policy are in central China, which have high rice mercury concentrations, rice production, and consumption. Our study suggests that addressing Chinese rice mercury contamination requires attention to contaminated soil and regulation of anthropogenic mercury emissions.

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Effects of humic acid on transport and transformation of mercury in soil-plant systems

Cited by 48 publications

References 9 publications

Estimating machine impact on strip roads via close-range photogrammetry and soil parameters: a case study in central Italy

Estimating machine impact on strip roads via close-range photogrammetry and soil parameters: a case study in central Italy

Bioavailability and mobility of mercury in selected soil profiles

Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling

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