scholarly journals Silicon Fractionation of Soluble Silicon in Volcanic Ash Soils That May Affect Groundwater Silicon Content on Jeju Island, Korea

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2686
Author(s):  
Won-Pyo Park ◽  
Hae-Nam Hyun ◽  
Bon-Jun Koo
Keyword(s):  
Silicon Content ◽  
Volcanic Ash ◽  
Jeju Island ◽  
Sequential Extraction Method ◽  
Amorphous Si ◽  
High Precipitation ◽  
Si Content ◽  
Pedogenic Processes ◽  
Soluble Silicon ◽  
Volcanic Ash Soils

Silicon (Si) is found in various fractions of soil, depending on the pedogenic processes of the environment. Dissolved Si (DSi) is adsorbed in soil particles or leaches through the soil profile into the groundwater. The objective of this study is to quantify, using the sequential extraction method, the different Si fractions in volcanic ash soils on Jeju Island that may affect groundwater Si content, and to compare them with those in forest soils on mainland Korea. Most of the Si in these soils was bound in unavailable forms as primary and secondary silicates. The second largest proportion of Si in the non-Andisols of Jeju Island and Korean mainland soils was accumulated as amorphous Si, while in the Andisols of Jeju Island, the second most significant Si fraction was in pedogenic oxides and hydroxides. The products of these soil formations were short-range-order minerals such as allophane (4–40%). The adsorbed Si concentration tended to increase at lower depths in Andisols (100–1400 mg kg−1) and was approximately five times higher than that in non-Andisols. The results indicate that Si is more soluble in the Andisols of high precipitation regions and that Andisols on Jeju Island potentially affect groundwater Si concentration.

scholarly journals Distribution of Available Silicon of Volcanic Ash Soils in Jeju Island

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Won-Pyo Park ◽  
Kwan-Cheol Song ◽  
Bon-Jun Koo ◽  
Hae-Nam Hyun
Keyword(s):  
Volcanic Ash ◽  
Chemical Properties ◽  
Jeju Island ◽  
A Value ◽  
Dissolved Silicon ◽  
Highly Correlated ◽  
Si Content ◽  
Pedogenic Processes ◽  
The Relationship ◽  
And Chemical Properties

In soils, dissolved silicon (Si) is adsorbed onto soil particles or is leached into groundwater through the soil profile. Andisols may play an important role in contributing to high dissolved Si concentrations in groundwater on Jeju Island, Korea. In this study, we evaluated the available Si content that potentially affects groundwater composition and investigated the relationship between the available Si content and chemical properties of volcanic ash soil on Jeju Island. We used the 1 M sodium acetate buffer (pH 4.0) to extract the available Si. Selected chemical properties were determined for 290 topsoil samples collected from different land sites throughout Jeju Island, and we analyzed the available Si content in the typifying pedons of Jeju Island and mainland Korea. The available Si content in Jeju Island topsoils ranged from 75 to 150 mg·kg−1, and the available Si content of Andisols in both orchards and grasslands was significantly higher than that of non-Andisols. The available Si content was highly correlated with the amounts of oxalate extractable Si, Al, and Fe in Andisols and was negatively related to the Alp/Alo ratio. With increasing elevation, we detected a decrease in the available Si and allophane content in Andisols, whereas Al-humus complexes increased with increasing elevation. The ratio of available Si in the lowest subsoil/topsoil increased to a value of 6.0, indicating that large amounts of available Si are present in the subsoil. The available Si content in the lowest subsoil of Andisols on Jeju Island was 10 times higher than that in the typifying pedons of the Korean mainland. In contrast, there were no differences in the available Si content between the topsoil and the subsoil of the typifying pedon series of Jeju and mainland non-Andisols because of differences in pedogenic processes. Collectively, our findings indicate that weathering of Andisols on Jeju Island potentially affects the Si concentration in groundwater.

scholarly journals Sorption and leaching characteristics of pesticides in volcanic ash soils of Jeju Island, Korea

2020 ◽  
Vol 63 (1) ◽  
Author(s):  
Won-Pyo Park ◽  
Kong-Man Chang ◽  
Hae-Nam Hyun ◽  
Kyung-Hwan Boo ◽  
Bon-Jun Koo
Keyword(s):  
Volcanic Ash ◽  
Agricultural Soils ◽  
Distribution Coefficients ◽  
The Other ◽  
Jeju Island ◽  
European Standard ◽  
Leaching Behavior ◽  
Mobility Assessment ◽  
Leaching Characteristics ◽  
Volcanic Ash Soils

Abstract It is important to evaluate leaching behavior in agricultural soils to prevent the pollution of groundwater by pesticides. We identified the distribution coefficients (Kd) of ten pesticides with different physicochemical properties and compared their leaching characteristics using wick lysimeters from three distinct soil types on Jeju Island. The Kd values varied by pesticide and soil, but were within the range of 1.2 to 4231 L kg−1. Based on the European standard (Kd < 10 L kg−1), six pesticides (alachlor, ethoprophos, carbofuran, napropamide, tebuconazole, and etridiazole) were mobile in at least one tested soil, and their soil organic carbon affinity was ≤ 5.811. This value differed greatly from the other pesticides (16.533 and higher). The solubility of the six mobile pesticides was ≥ 32 mg L−1, which substantially differed from the other pesticides (≤ 0.71 mg L−1). Thus, we conclude that our mobility assessment, which is based on Kd values, can be used to predict the leaching of pesticides in the volcanic ash soils of Jeju Island. The use of pesticides should be strictly controlled to reduce the possibility of groundwater contamination.

Leaf silicon content in banana (Musa spp.) reveals the weathering stage of volcanic ash soils in Guadeloupe

2008 ◽  
Vol 313 (1-2) ◽  
pp. 71-82 ◽  
Author(s):  
C. Henriet ◽  
L. Bodarwé ◽  
M. Dorel ◽  
X. Draye ◽  
B. Delvaux
Keyword(s):  
Silicon Content ◽  
Volcanic Ash ◽  
Musa Spp ◽  
Volcanic Ash Soils

scholarly journals Silicon and Aluminum Mobility in Soils of Jeju Island, Korea

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Won-Pyo Park ◽  
Bon-Jun Koo
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Jeju Island ◽  
Annual Precipitation ◽  
Mean Annual Precipitation ◽  
Soil Series ◽  
High Concentration ◽  
Volcanic Ash Soil ◽  
Low Altitude ◽  
Volcanic Ash Soils

The objective of the study is to investigate the effect of released silicon (Si) and aluminum (Al) during the formation of volcanic ash soil on the content of Si in groundwater on Jeju Island. Volcanic ash soils in Jeju Island were formed from pyroclastic materials that originated from basalt. We sampled four profiles, including basaltic bedrock of each soil series with large variations in elevation (160–320 m) and mean annual precipitation (MAP; 1,800–2,600 mm). The soil and bedrock minerals were analyzed for weathering of volcanic ash soils related to mineralogical transformations and mobility of Si and Al. Andisols (above 2,000 mm MAP) were dominantly composed of allophane and gibbsite. In Andisols used in the study, 10–70% of Si was lost, whereas the amount of Al was relatively conserved. This is because Al forms Al-humus complex and Andisols contain allophane. In contrast, non-Andisols located at low altitude with lower than 1,800 mm MAP were enriched with considerable amounts of Si and Al, because non-Andisols have crystalline clay minerals and quartz. These results indicate that Andisols, which are widely distributed in Jeju Island, may play an important role in contributing to the high concentration of dissolved Si in the groundwater.

scholarly journals Assessment of Riverbed Sediments Originated from Volcanic Ash Soils in Jeju Island

2019 ◽  
Vol 22 (4) ◽  
pp. 303-311
Author(s):  
Ki Moon Bong ◽  
Hae Jong Yang ◽  
Tae-Woo Kang ◽  
Jong Hak Han ◽  
Hyo Jin Jeong ◽  
...  
Keyword(s):  
Volcanic Ash ◽  
Jeju Island ◽  
Riverbed Sediments ◽  
Volcanic Ash Soils

Specific Retention of Radiocesium in Volcanic Ash Soils Devoid of Micaceous Clay Minerals

2004 ◽  
Vol 68 (1) ◽  
pp. 313 ◽  
Author(s):  
Emmanuel Joussein ◽  
Nathalie Kruyts ◽  
Dominique Righi ◽  
Sabine Petit ◽  
Bruno Delvaux
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Specific Retention ◽  
Volcanic Ash Soils

scholarly journals Alkalinity–silicon ratio as an assessment factor for the efficiency of silicate slags in wetland rice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thoppil Sreenivasan Sandhya ◽  
Nagabovanalli Basavarajappa Prakash
Keyword(s):  
Silicon Content ◽  
Chemical Properties ◽  
Magnesium Content ◽  
Wetland Rice ◽  
Agronomic Efficiency ◽  
Economic Production ◽  
Incubation Experiments ◽  
Calcium And Magnesium ◽  
Si Content ◽  
Assessment Factor

AbstractSilicate slags are one of the most widely used silicon (Si) source in agriculture. Even though the agronomic significance of slags has been demonstrated in several crops, only a few attempts were made to evaluate these Si sources based on their chemical composition. The main objective of this study was to characterize different silicate slags based on their chemical properties and to explore the effect of these chemical properties on the yield, and Si uptake in wetland rice, and dissolution of Si into the soil. Slags were characterised for pH, calcium and magnesium content (alkalinity, A), silicon content, 5 day Na2CO3 + NH4NO3 extractable Si content, and alkalinity to Si ratio (A/Si). Greenhouse and incubation experiments were also conducted using different silicate slags and wollastonite applied at the rate of 300 kg Si ha−1. Slags with A/Si < 3 were found to be ideal Si sources for the economic production of wetland rice and found consistent in increasing soil Si content and rice Si uptake. We conclude that the A/Si ratio of slags can be used as an important parameter to assess the agronomic efficiency of silicate slags in wetland rice.

Aluminum concentrations in sclerotia from a buried humic horizon of volcanic ash soils in Mt. Myoko, Central Japan

2001 ◽  
Vol 47 (2) ◽  
pp. 411-418 ◽  
Author(s):  
Makiko Watanabe ◽  
Nobuhide Fujitake ◽  
Hiroyuki Ohta ◽  
Takushi Yokoyama
Keyword(s):  
Volcanic Ash ◽  
Central Japan ◽  
Humic Horizon ◽  
Volcanic Ash Soils

Models relating soil pH measurements in H2O, KCl and CaCl2 for volcanic ash soils of Cameroon

2018 ◽  
Vol 14 ◽  
pp. e00185 ◽  
Author(s):  
Georges Kogge Kome ◽  
Roger Kogge Enang ◽  
Bernard Palmer Kfuban Yerima ◽  
Meli Gilles Raoul Lontsi
Keyword(s):  
Soil Ph ◽  
Volcanic Ash ◽  
Ph Measurements ◽  
Volcanic Ash Soils
Sign in / Sign up

Export Citation Format

Share Document