Silicon isotope fractionation between rice plants and nutrient solution and its significance to the study of the silicon cycle

Ding, Tao; Tian, Shihong; Sun, Li; Wu, Lianghuan; Zhou, Jianxi; Chen, Z.Y.

doi:10.1016/j.gca.2008.09.006

Cited by 65 publications

(81 citation statements)

References 83 publications

(145 reference statements)

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“…These all show that the new secondary mineral phases have less of the heavier isotopes relative to river waters. The same discrimination is also well established for plants (Ding et al, 2005(Ding et al, , 2008aOpfergelt et al, 2006a,b), freshwater diatoms Panizzo et al, 2016) and sponges, which preferentially utilize 28 Si over 30 Si (and 29 Si), thus leading to an increase in δ 30 Si in the host water.…”

Section: Riverssupporting

confidence: 60%

Section: Vegetationmentioning

confidence: 99%

“…The δ 30 Si composition of these plants (Figure 1), and in particular of phytoliths is in the first instance regulated by the physical environment around the plant including the soluble Si concentration of the medium (Opfergelt et al, 2006b), the weathering of the soil substrate (Opfergelt et al, 2008) and soil organic matter (Ding et al, 2008a). Beyond this, there is clear evidence that significant isotopic fractionation can occur between plants with increased fractionation in heavy Si accumulators (Ding et al, 2005(Ding et al, , 2008aOpfergelt et al, 2006a,b). Rayleigh fractionation during the transportation of Si within plants also causes heavier isotopes to be concentrated within the xylem whilst lighter isotopes are preferentially deposited in phytoliths lower down the plant (Ding et al, 2005(Ding et al, , 2008aOpfergelt et al, 2006a,b;Hodson et al, 2008).…”

Section: Vegetationmentioning

confidence: 99%

“…Beyond this, there is clear evidence that significant isotopic fractionation can occur between plants with increased fractionation in heavy Si accumulators (Ding et al, 2005(Ding et al, , 2008aOpfergelt et al, 2006a,b). Rayleigh fractionation during the transportation of Si within plants also causes heavier isotopes to be concentrated within the xylem whilst lighter isotopes are preferentially deposited in phytoliths lower down the plant (Ding et al, 2005(Ding et al, , 2008aOpfergelt et al, 2006a,b;Hodson et al, 2008). Phytoliths have higher dissolution rates than other silicate materials (e.g., tephra, clay, feldspars, quartz), and provide a major source of DSi in some soil/terrestrial environments (Derry et al, 2005;Struyf et al, 2009;Cornelis et al, 2010;Opfergelt et al, 2010).…”

Section: Vegetationmentioning

confidence: 99%

See 3 more Smart Citations

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

et al. 2018

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Section: Riverssupporting

confidence: 60%

Section: Vegetationmentioning

confidence: 99%

Section: Vegetationmentioning

confidence: 99%

Section: Vegetationmentioning

confidence: 99%

See 2 more Smart Citations

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

et al. 2018

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“…DSi is unaffected by atmospheric contribution and is treated here as a record of the dissolution of primary silicate minerals. Cycling of Si by vegetation (Derry et al, 2005;Ding et al, 2005Ding et al, , 2008Ding et al, , 2009) and clay precipitation and/or dissolution (Georg et al, 2007) impact the stable isotope composition of dissolved silica but not the export flux, unless the system is out of steady state. The Si-cycle is, perhaps somewhat simplistically, treated as a steady state system in this study.…”

Section: Introductionmentioning

confidence: 99%

Chemical weathering fluxes from volcanic islands and the importance of groundwater: The Hawaiian example

Schopka

Derry

2012

Earth and Planetary Science Letters

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We investigated the products and rates of chemical weathering on the Hawaiian Islands, sampling streams on Kaua'i and both streams and groundwater wells on the island of Hawai'i. Dissolved silica was used to investigate the flowpaths of water drained into streams. We found that flowpaths exert a major control on the observed chemical weathering rates. A strong link exists between the degree of landscape dissection and flowpaths of water through the landscape, with streams in undissected landscapes receiving water mainly from surface runoff and streams in highly dissected landscapes receiving a considerable fraction of their water from groundwater (springs and/or seepage). Total alkalinity in Hawaiian streams and groundwater is produced exclusively by silicate chemical weathering. We find that fluxes of total alkalinity (often called "CO 2 consumption rate" in the geochemical literature), from the islands are lower than those observed in basaltic regions elsewhere. Groundwater is, overall, the major transport vector for products of chemical weathering from the Hawaiian Islands. On the youngest and largest island, submarine groundwater discharge (SGD) transports more than an order of magnitude more solutes to the ocean than surface water and on the youngest part of the youngest island, SGD is the only link between the terrestrial weathering system and the ocean. These results suggest that groundwater, and particularly SGD, needs to be included in geochemical weathering budgets of volcanic islands.

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Silicon isotope fractionation in rice and cucumber plants over a life cycle: Laboratory studies at different external silicon concentrations

Sun

et al. 2016

JGR Biogeosciences

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Understanding the variations of silicon isotopes in terrestrial higher plants can be helpful toward elucidating the global biogeochemical silicon cycle. We studied silicon isotope fractionation in rice and cucumber plants over their entire life cycles. These two different silicon‐absorbing plants were grown hydroponically at different external silicon concentrations. The ranges of δ30Si values in rice were −1.89‰ to 1.69‰, −1.81‰ to 1.96‰, and −2.08‰ to 2.02‰ at 0.17 mM, 1.70 mM, and 8.50 mM silicon concentrations, respectively. The ranges of δ30Si values in cucumber were −1.38‰ to 1.21‰, −1.33‰ to 1.26‰, and −1.62‰ to 1.40‰ at 0.085 mM, 0.17 mM, and 1.70 mM external silicon concentrations, respectively. A general increasing trend in δ30Si values from lower to upper plant parts reflected the preferential incorporation of lighter silicon isotopes from transpired water to biogenic opal. Furthermore, the active uptake mechanism regulated by several transporters might have also played an important role in the preferential transport of heavy silicon isotopes into aboveground plant parts. This suggested that silicon isotope fractionation in both rice and cucumber was a Rayleigh‐like process. The data on δ30Si values for the whole plants and nutrient solutions indicated that biologically mediated silicon isotope fractionation occurred during silicon uptake by roots. At lower external silicon concentrations, heavy silicon isotopes entered plants more readily than light silicon isotopes. Conversely, at higher external silicon concentrations, light silicon isotopes entered plants more readily than heavy silicon isotopes.

show abstract

Silicon isotope fractionation between rice plants and nutrient solution and its significance to the study of the silicon cycle

Cited by 65 publications

References 83 publications

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

Chemical weathering fluxes from volcanic islands and the importance of groundwater: The Hawaiian example

Silicon isotope fractionation in rice and cucumber plants over a life cycle: Laboratory studies at different external silicon concentrations

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