Geochemical investigation of soils developed in different lithologies in Bhutan, Eastern Himalayas

Caspari, Thomas; Bäumler, Rupert; Norbu, Chencho; Tshering, Kinlay; Baillie, Ian

doi:10.1016/j.geoderma.2006.04.017

Cited by 66 publications

(35 citation statements)

References 54 publications

(69 reference statements)

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“…Persistent investigations on the controls of chemical weathering have contributed a lot to our understanding on the links between chemical weathering and its controlling factors, such as tectonics (geological settings and topographical conditions) (Raymo et al, 1988;Drever and Zobrist, 1992;Raymo and Ruddiman, 1992;Berner and Berner, 1997;Riebe et al, 2001;Jacobson et al, 2003;West et al, 2005;Liu et al, 2007a,b;Moore et al, 2013); provenance (or lithology of source rock) (Sawyer, 1986;Nesbitt and Wilson, 1992;Le Pera et al, 2001;Dessert et al, 2003;Price and Velbel, 2003;Caspari et al, 2006); climate (temperature, precipitation and runoff) (Velbel, 1993;Brady and Carroll, 1994;White and Blum, 1995;Riebe et al, 2001Riebe et al, , 2004Yang et al, 2004;Deepthy and Balakrishnan, 2005;Singh et al, 2005;West et al, 2005;Liu et al, 2007a,b;Gislason et al, 2008;Gabet et al, 2010;Li and Yang, 2010); vegetation (Berner, 1992;Drever, 1994;Gislason et al, 1996); time (Grantham and Velbel, 1988;Taylor and Blum, 1995;Gislason et al, 1996;White and Brantley, 2003); and even human activities (Motuzova and Hong Van, 1999;Chetelat et al, 2008). Although much work has been done, controversies still remain on the control...…”

Section: Introductionmentioning

confidence: 99%

“…To solve this problem, various solutions and chemical indices have been established and applied, most of which are based on major element analyses, such as SiO 2 /Al 2 O 3 ratio (Ruxton, 1968), WIP (weathering index of Parker) (Parker, 1970), CIA (chemical index of alteration) (Nesbitt and Young, 1982), CIW (chemical index of weathering) (Harnois, 1988), and ternary diagrams of chemical elements (Nesbitt and Young, 1989;Ohta and Arai, 2007). Good results have been obtained in their applications to the geochemistry of weathering profiles (Nesbitt and Young, 1989;Nesbitt and Wilson, 1992;Ng et al, 2001;Duzgoren-Aydin and Aydin, 2003;Price and Velbel, 2003;Deepthy and Balakrishnan, 2005;Singh et al, 2005;Caspari et al, 2006;Ohta and Arai, 2007;Shao et al, 2012) and river chemistry of dissolved loads (Liu et al, 2004(Liu et al, , 2007a(Liu et al, ,b, 2009Li and Yang, 2010;Shao et al, 2012). In fact, till present, most of our chemical weathering information is obtained from the geochemistry of weathering profiles and river chemistry of dissolved loads.…”

Section: Introductionmentioning

confidence: 99%

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Chemical weathering of monsoonal eastern China: implications from major elements of topsoil

Qiu

Zhu

Tian

et al. 2014

Journal of Asian Earth Sciences

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical weathering of monsoonal eastern China: implications from major elements of topsoil

Qiu

Zhu

Tian

et al. 2014

Journal of Asian Earth Sciences

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“…Metals generally have a strong af fi nity for the soil-clay fraction (Owojori et al 2010 ) , and that fi ne soil fraction is often pollutant enriched. In contrast, Zr is mainly present as zircon grains in the coarse fractions of soils (Stiles et al 2003 ;Caspari et al 2006 ) . However, Zr sorption onto the solid surfaces of soil may in fl uence its mobility and bioavailability (Klechkovsky and Gulyakin 1958 ;Udovic and Lestan 2009 ;Rascio and NavariIzzo 2011 ) .…”

Section: Retention Mobility and Bioavailability Of Zr In Soilsmentioning

confidence: 99%

Behavior and Impact of Zirconium in the Soil–Plant System: Plant Uptake and Phytotoxicity

Shahid

Ferrand

Schreck

et al. 2012

Reviews of Environmental Contamination and Toxicology Volume 221

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Zirconium (Zr) is a transition metal that has both stable and radioactive isotopes.This metal has gained significant attention as a major pollutant of concern, partly because it has been prominent in the debate concerning the growing anthropogenic pressure on the environment. Its numerous past and present uses have induced significant soil and water pollution. Zr is generally considered to have low mobility in soils. The behavior of Zr particularly depends on the characteristics of the media in which it exists, and even its presence in the biosphere as a contaminate may affect its behavior. In this chapter, we describe the relationship between the behavior of Zrand its speciation in soils, its uptake and accumulation by plants, its translocation and toxicity inside plants, and mechanisms by which plants detoxify it.Zr is abundant and occurs naturally in the earth's crust. Zr emissions to the atmosphere are increasing from anthropogenic activities such as its use in industry and nuclear reactors. Zr forms various complexes with soil components, which reduces its soil mobility and phytoavailabilty. The mobility and phytoavailabilty of Zr in soil depend on its speciation and the physicochemical properties of soil that include soil pH, texture, and organic contents. Despite having low soil mobility and phytoavailability,amounts of Zr are absorbed by plants, mainly through the root system and can thereby enter the food chain.After plant uptake, Zr mainly accumulates in root cells. Zr does not have any known essential function in plant or animal metabolism. Although little published data are available, we conclude that the phytotoxicity of Zr is generally low.Notwithstanding, Zr can significantly reduce plant growth and can affect plantenzyme activity. When exposed to Zr-induced toxicity, plants possess numerous defense mechanisms to cope with the toxicity. Such strategies include Zr sequestration in plant roots and activation of various antioxidants. Because Zr may have impact on the biosphere, we believe it deserves to be evaluated in supplementary studies that will enhance the understanding of its behavior in soil-plant systems.

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“…There is also a difference concerning light and heavy REE behavior in soil, with LREE being mainly associated to clayey soils, whereas HREE are more associated to sandy soils [62]. This occurs because HREE are more associated to refractory minerals (e.g., zircon), which are more resistant to weathering, and therefore remain in the coarser fraction of the soil [63].…”

Section: Soil Behaviormentioning

confidence: 99%

Rare Earth Elements in the Soil Environment

et al. 2016

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Rare earth elements (REE) are a homogenous group of 17 chemical elements in the periodic table that are key to many modern industries including chemicals, consumer electronics, clean energy, transportation, health care, aviation, and defense. Moreover, in recent years, they have been used in agriculture. One of the consequences of their worldwide use is the possible increase of their levels in various environmental compartments. This review addresses major topics concerning the study of REE in the soil environment, with special attention to the latest research findings. The main sources of REE to soils, the contents of REE in soils worldwide, and relevant information on the effects of REE to plants were explored. Ecological and human health risk issues related to the presence of REE in soils were also discussed. Although several findings reported positive effects of REE on plant growth, many questions about their biological role remain unanswered. Therefore, studies concerning the actual mechanism of action of these elements on cellular and physiological processes should be further refined. Even more urgent is to unveil their chemical behavior in soils and the ecological and human health risks that might be associated with the widespread use of REE in our modern society.

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Geochemical investigation of soils developed in different lithologies in Bhutan, Eastern Himalayas

Cited by 66 publications

References 54 publications

Chemical weathering of monsoonal eastern China: implications from major elements of topsoil

Chemical weathering of monsoonal eastern China: implications from major elements of topsoil

Behavior and Impact of Zirconium in the Soil–Plant System: Plant Uptake and Phytotoxicity

Rare Earth Elements in the Soil Environment

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