Mercury in rice ( Oryza sativa L. ) and rice-paddy soils under long-term fertilizer and organic amendment

Tang, Zhenya; Fan, Fangling; Wang, Xinyue; Shi, Xiaojun; Deng, Shiping; Wang, Dingyong

doi:10.1016/j.ecoenv.2017.12.021

Cited by 58 publications

(20 citation statements)

References 46 publications

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“…Converse to our predictions, mercury was lower in bats living in the less heterogeneous landscapes. In Asia, soils of rice paddies may be sinks for mercury deposition and accumulation and provide an ideal environment for bacteria that methylate inorganic mercury (Stubner et al, 1998;Horvat et al, 2003;Meng et al, 2010Meng et al, , 2011Feng et al, 2016;Tang et al, 2018). One reason for the lower concentration of mercury in bats from the less heterogeneous landscapes might relate to their lower trophic position as compared to bats from the more heterogeneous landscapes, which would be consistent with the hypothesis of a lower bioamplification effect due to shorter and less complex food webs.…”

Section: Discussionmentioning

confidence: 53%

“…The Food and Agriculture Organization estimate that South and Southeast Asia experienced the highest loss of canopy cover (over 50 million ha) from 2000 to 2012 and the highest loss in carbon stock from 2010 to 2015 compared to other regions (FAO, 2015). In many tropical regions, deforestation and conversion of natural lands into agricultural lands, soil erosion, and gold mining have also increased exposure of wildlife and humans to mercury contamination (Stubner et al, 1998;Horvat et al, 2003;Meng et al, 2010Meng et al, , 2011Krisnayanti et al, 2012;Tang et al, 2018). For example, several studies in Asia have found that rice paddy soil hosts bacteria that can methylate inorganic mercury, which facilitates the bioaccumulation of mercury along food chains (e.g., Stubner et al, 1998;Meng et al 2010Meng et al , 2011.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of land use on an insectivorous tropical bat: The importance of mercury, physio-immunology and trophic position

Czirják

Bustamante

Bumrungsri

et al. 2019

Science of The Total Environment

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Deforestation, agricultural intensification, and habitat homogenization are critical threats to biodiversity in Southeast Asia. Limited information is available on the trophic and physiological responses of tropical animals to these environmental changes. The wrinklelipped free-tailed bat Chaerephon plicatus is a cave roosting species that is experiencing population declines across Southeast Asia, where landscapes have been drastically modified.In our study site in central Thailand, we tested the hypothesis that wrinkle-lipped free-tailed bats living in landscapes that contrast in heterogeneity and land-use differed in mercury contamination, trophic position and physio-immunological status. Bats from less heterogeneous landscapes (dominated by rice crops, absence of large forest patches) occupied a lower trophic position than conspecifics from more heterogeneous landscapes (including large forest patches). Additionally, bats from these habitats had lower concentrations of mercury in erythrocytes, lower body mass, higher antioxidant superoxide dismutase (SOD), lower antioxidant glutathione peroxidase (GPx) and lower values of the GPx/SOD ratio than bats from more heterogeneous landscapes. Individual bat mercury concentrations were positively correlated with body mass and two immune markers (lysozyme and immunoglobulin) but were negatively correlated with plasma non-enzymatic antioxidant capacity. Our results suggest various links between landscape heterogeneity, mercury accumulation/exposure, and health status of wildlife in Southeast Asian countries.

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Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Impacts of land use on an insectivorous tropical bat: The importance of mercury, physio-immunology and trophic position

Czirják

Bustamante

Bumrungsri

et al. 2019

Science of The Total Environment

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“…Soil nutrients are necessary for tree growth and fruit nutrient enrichment. There have been numerous studies of the scientific management of orchard soils as well as reasonable quantitative fertilization formulas [26, 27]. Wang et al explored the fertilization measures for high yield and a high amylopectin/total starch ratio in the Hongliangfeng 1 waxy sorghum cultivar.…”

Section: Discussionmentioning

confidence: 99%

Two-dimensional fruit quality factors and soil nutrients reveals more favorable topographic plantation of Xinjiang jujubes in China

Wang

He²,

Kang³

et al. 2019

PLoS ONE

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Jujubes (Ziziphus jujuba Mill.) are among the main agroeconomically important crops in Xinjiang, China, and those from this region have the highest production worldwide. However, the reason for the high quality of the jujubes in the region is unknown. In our current research, the total phosphorus (P), total nitrogen (N), organic matter (OM), available P, alkaline N and quick potassium (K) were quantitatively analyzed in soils collected from orchards in 11 geographical locations, counties or cities, in Xinjiang. Meanwhile, the P, total triterpenoids, soluble solids, polysaccharide and cyclic adenosine monophosphate (CAMP) contents were also used to indicate fruit quality. Based on the analyzed data, principal component analysis (PCA) and multiple regression analysis revealed a high correlation between soil nutrients and the quality of the Jun jujube, which was used as an example. Specifically, the total P and quick K contents significantly differed among the orchard soils. Moreover, they significantly affected fruit quality. Total P significantly affected the soluble solids and total triterpenoids contents and was negatively correlated with the former and positively correlated with the latter. In addition, the soluble solids and total triterpenoids contents were significantly affected by the quick K content; as the quick K content increased, the soluble solids content gradually increased, while the total triterpenoids content decreased. According to the response surface model, we suggest that when the total P and quick K contents in the soil in Xinjiang were 0.76 g/kg and 365.04 mg/kg, respectively, the optimal fruit quality was obtained. Therefore, two-dimensional analysis of fruit quality and soil nutrients showed that it is necessary to increase the total P and quick K contents in the soil used to grow jujubes in Xinjiang.

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“…Hg methylation and mobilization is intensively studied in paddy field soils and peat soils due to their relevance in food production or the Hg global cycle (Wang et al, 2019;Tang et al, 2018;Liu et al, 2016;Hu et al, 2019;Wang et al, 2016;Zhao et al, 2018;Zhu et al, 2016;Kronberg et al, 2016;Skyllberg, 2008;Skyllberg et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…However, only few studies focused on Hg methylation and mobility in temperate floodplain soils (Frohne et al, 2012;Hofacker et al, 2013;Weber et al, 2009;Gilli et al, 2018;Poulin et al, 2016). As well, few studies have examined the effect of flooding and/or land use (NOM addition in the form of animal manure) in polluted soils with respect to Hg release and methylation potential (Tang et al, 2018;Gygax et al, 2019;Zhang et al, 2018;Hofacker et al, 2013;Frohne et al, 2012). Furthermore, most of these studies were focusing on soils with rather high OC https://doi.org/10.5194/bg-2020-466 Preprint.…”

Section: Introductionmentioning

confidence: 99%

Comment on bg-2020-466

Poulin¹

2021

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Floodplain soils polluted with high levels of mercury (Hg) are potential point sources to downstream eco-systems.Repeated flooding (e.g. redox cycling) and agricultural activities (e.g. organic matter addition) may influence the fate and speciation of Hg in these soil systems. The formation and aggregation of colloids and particles influences both Hg mobility and its bioavailability to methylmercury (MeHg) forming microbes. In this study, we conducted a microcosm flooding-draining experiment on Hg polluted floodplain soils originating from an agriculturally used area situated in the Rhone Valley (Valais, Switzerland). The experiment comprised two 14 days flooding periods separated by one 14 days draining period. The effect of freshly added natural organic matter on Hg dynamics was assessed by adding liquid cow manure (+MNR) to two control soils characterized by different Hg (47.3 ± 0.6 mg kg -1 or 2.38 ± 0.01 mg kg -1 ) and organic carbon (OC: 1.92 wt. % or 3.45 wt. %) contents. During the experiment, the release, colloid formation and methylation of Hg in the soil solution were monitored. Upon manure addition in the highly polluted soil (lowest OC), an accelerated release of Hg to the soil solution could be linked to a fast reductive dissolution of Mn oxides. The manure treatments showed a fast sequestration of Hg and a higher percentage of particulate (0.02 -10 µm) bound Hg. As well, analyses of soil solutions by asymmetrical flow field-flow fractionation coupled with inductively coupled plasma mass spectrometry (AF4-ICP-MS) revealed a proportional increase of colloidal DOM-Hg and inorganic colloidal Hg (+MNR: 70 -100 %; control: 32 -70 %) upon manure addition. Our experiment shows that net Hg methylation (MeHg/Hg) was highest after the first draining period and decreased again after the second flooding period. No significant effects on methylation upon manure addition was found. The results of this study suggest that manure addition may promote sequestration by Hg complexation on large organic matter components and the formation/aggregation of inorganic HgS(s) colloids in Hg polluted fluvisols with low levels of natural organic matter.

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Mercury in rice ( Oryza sativa L. ) and rice-paddy soils under long-term fertilizer and organic amendment

Cited by 58 publications

References 46 publications

Impacts of land use on an insectivorous tropical bat: The importance of mercury, physio-immunology and trophic position

Impacts of land use on an insectivorous tropical bat: The importance of mercury, physio-immunology and trophic position

Two-dimensional fruit quality factors and soil nutrients reveals more favorable topographic plantation of Xinjiang jujubes in China

Comment on bg-2020-466

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