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Dr. Won-Pyo Park
Major of Plant Resources and Environment, Jeju National University

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0 Fertilizers
0 Soil
0 Soil Analysis And Management
0 soil and enviroment
0 volcanic ash soil

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Research article
Published: 10 October 2020 in Applied and Environmental Soil Science
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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.

ACS Style

Won-Pyo Park; Bon-Jun Koo. Silicon and Aluminum Mobility in Soils of Jeju Island, Korea. Applied and Environmental Soil Science 2020, 2020, 1 -12.

AMA Style

Won-Pyo Park, Bon-Jun Koo. Silicon and Aluminum Mobility in Soils of Jeju Island, Korea. Applied and Environmental Soil Science. 2020; 2020 ():1-12.

Chicago/Turabian Style

Won-Pyo Park; Bon-Jun Koo. 2020. "Silicon and Aluminum Mobility in Soils of Jeju Island, Korea." Applied and Environmental Soil Science 2020, no. : 1-12.

Journal article
Published: 30 September 2020 in Chemosphere
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In this study, we investigated the concentrations of Fukushima nuclear power plant accident (FNPPA)-derived radiocesium (134Cs, 137Cs) deposited in the topsoil of Jeju Island, Korea. We also evaluated the soil inventories of radionuclides and compared the concentrations deposited by rainwater and fallout. We present the first evidence of FNPPA-derived radionuclides directly entering the environment of Jeju Island. In the case of FNPPA-derived 134Cs in soil, only a trace amount was identified in the surface layer (1 cm depth), whereas 137Cs derived from past atmospheric deposition of nuclear testing were detected along with those derived from the nuclear power plant accident. The total measured radiocesium (134Cs + 137Cs) indicates that although the value obtained from soils was slightly lower, both values were within the same order of magnitude. Of the FNPPA-derived radiocesium deposited in the soil, the impact from April 2011 was the largest at most sampling sites indicating that the radioactive plume directly covered Jeju Island. Furthermore, a variety of long- and short-lived gamma-emitting radionuclides were detected in the rainwater samples collected on April 7, 2011. Among them, short-lived radionuclides such as 140La, 110mAg, 95Nb, 125Sb, 113Sn, 129Te, 129mTe, 132Te, 132I, and 136Cs, were observed. The findings of this study provide evidence for the direct effects of FNPPA-derived radionuclides in Jeju Island. This is the first location in Korea and the first in the entire East Asian region, excluding Japan that is confirmed to have been directly affected FNPP accident.

ACS Style

Tae-Woo Kang; Young-Un Han; Eun Hye Na; Bon-Jun Koo; Won-Pyo Park. Deposition of Fukushima nuclear power plant accident-derived radiocesium in the soils of Jeju Island, Korea, and evidence for long- and short-lived radionuclides in rainwater. Chemosphere 2020, 264, 128457 .

AMA Style

Tae-Woo Kang, Young-Un Han, Eun Hye Na, Bon-Jun Koo, Won-Pyo Park. Deposition of Fukushima nuclear power plant accident-derived radiocesium in the soils of Jeju Island, Korea, and evidence for long- and short-lived radionuclides in rainwater. Chemosphere. 2020; 264 ():128457.

Chicago/Turabian Style

Tae-Woo Kang; Young-Un Han; Eun Hye Na; Bon-Jun Koo; Won-Pyo Park. 2020. "Deposition of Fukushima nuclear power plant accident-derived radiocesium in the soils of Jeju Island, Korea, and evidence for long- and short-lived radionuclides in rainwater." Chemosphere 264, no. : 128457.

Journal article
Published: 25 September 2020 in Water
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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.

ACS Style

Won-Pyo Park; Hae-Nam Hyun; Bon-Jun Koo. Silicon Fractionation of Soluble Silicon in Volcanic Ash Soils That May Affect Groundwater Silicon Content on Jeju Island, Korea. Water 2020, 12, 2686 .

AMA Style

Won-Pyo Park, Hae-Nam Hyun, Bon-Jun Koo. Silicon Fractionation of Soluble Silicon in Volcanic Ash Soils That May Affect Groundwater Silicon Content on Jeju Island, Korea. Water. 2020; 12 (10):2686.

Chicago/Turabian Style

Won-Pyo Park; Hae-Nam Hyun; Bon-Jun Koo. 2020. "Silicon Fractionation of Soluble Silicon in Volcanic Ash Soils That May Affect Groundwater Silicon Content on Jeju Island, Korea." Water 12, no. 10: 2686.

Research article
Published: 22 September 2019 in Applied and Environmental Soil Science
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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.

ACS Style

Won-Pyo Park; Kwan-Cheol Song; Bon-Jun Koo; Hae-Nam Hyun. Distribution of Available Silicon of Volcanic Ash Soils in Jeju Island. Applied and Environmental Soil Science 2019, 2019, 1 -10.

AMA Style

Won-Pyo Park, Kwan-Cheol Song, Bon-Jun Koo, Hae-Nam Hyun. Distribution of Available Silicon of Volcanic Ash Soils in Jeju Island. Applied and Environmental Soil Science. 2019; 2019 ():1-10.

Chicago/Turabian Style

Won-Pyo Park; Kwan-Cheol Song; Bon-Jun Koo; Hae-Nam Hyun. 2019. "Distribution of Available Silicon of Volcanic Ash Soils in Jeju Island." Applied and Environmental Soil Science 2019, no. : 1-10.