研究者詳細 - 中丸　康夫

論文 - 中丸　康夫

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Role of soil organic matter in the mobility of radiocesium in agricultural soils common in Japan

Nao Ishikawa, Keiko Tagami, Shugeo Uchida、中丸　康夫

Colloids and Surfaces A: Physicochemical and Engineering Aspects,306, 111-117 (2007) 2007年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Cesium-137 is an important radionuclide. In order to evaluate the radiation dose from 137Cs, it is important to know its mobility in different soils. Soil organic matter (SOM) might affect the 137Cs mobility because SOM is a reactive colloid. Therefore, tracer studies were carried out to clarify the effect of SOM on Cs mobility in different soils. The experimental results suggested that SOM could increase the mobility of 137Cs in soils by binding it in exchangeable and DOM-bound forms.
土壌中におけるCs-137の収着挙動を調べた結果，土壌有機物はCs-137の収着を妨げることがわかった。

DOI： https://doi.org/10.1016/j.colsurfa.2007.01.014

Distribution coefficients of tin (Sn) in Japanese agricultural soils

Shigeo Uchida、中丸　康夫

Proceedings of 18th World Congress of Soil Science 2006年07月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Sorption behavior of tin (Sn) in Japanese agricultural soils was studied. Soil-soil solution distribution coefficient (Kd) of Sn (Kd-Sn) for 142 soil samples were ranged between 128-1590000 (L/kg) with the geometric mean of 12400 (L/kg).. The pH effect on Sn mobility in soil-solution system was also investigated. The Kd-Sn values for the soils The Kd values for Andosols tended to be higher than those of the other soil groups. The Kd measurements under different pH levels showed that the Kd-Sn increased with decreasing pH. This suggested that the low pH condition enhanced the sorption reaction of Sn in soils. The soil-sorbed Sn fractions in each type of soil colloid were also evaluated with selective extraction methods. The results showed that most of the soil-sorbed Sn was as organic matter-bound and Al/Fe-(hydr)oxide-bound forms.

DOI： https://doi.org/10.1016/j.jenvrad.2007.11.012

根圏土壌におけるCsおよびSrの可給性に及ぼす植物生育ステージの影響

中丸　康夫

Radioisotopes,55, 125-133 (2006) 2006年03月

記述言語：日本語掲載種別：研究論文（学術雑誌）

CsおよびSrの土壌-植物移行における、植物生育段階の影響について、ダイズを用いたポット栽培試験によって検討した。ダイズ植栽区と無植栽区を設け、生育期間中のMg、K、Ca、SrおよびCsの土壌溶液中濃度、植物中濃度、および蒸散量を測定した。植物生育にともない、土壌溶液中のMg、K、Ca、SrおよびCs濃度は減少した。Mg、Ca、KおよびSrの濃度低下は植栽区で顕著であり、ダイズによる吸収により、土壌溶液中の濃度が減少したと考えられる。一方でCsについては、植栽区と無植栽区との差は少なかった。蒸散量から各元素のマスフローによる根表面への移動量を計算し、実際の吸収量と比較したところ、Csについては、根近傍（根圏）においてCsの吸収が阻害され、それは生育後半においてより顕著となることが示された。根密度
の高い小スケール栽培により、根圏土壌におけるCs、Srの可給性について検討した結果、根圏において局所的にCs の分配係数(Kd)が増加することが示された。これらの結果から、長期的な栽培においては、栽培にともなう根圏のK濃度減少にともない、根圏においてCsの固定が促進され、生育後半にはCsの可給性が減少したものと考えられる。こうした根圏における可給性の低下はSrについては認められなかった。

DOI： https://doi.org/10.3769/radioisotopes.55.125

Effect of nutrient uptake by plant roots on the fate of REEs in soil

Tagami, K., and Uchida, S.、中丸　康夫

Journal of Alloys and Compounds, 408-412, 413-416 (2006) 2006年02月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Concentrations of rare earth elements (REEs) and major ions in soil solutions were observed under different growth stages of soybean in order to evaluate the effect of nutrient uptake by plant roots on the mobility of REEs in soil-plant systems. Soybean plants were grown in pots, which were kept in a greenhouse for 84 d. The concentrations of major nutrient cations (K and Ca) in the soil solution decreased with the soybean growth. On the other hand, the concentrations of Al, Y, La, Ce, Nd, Gd, Dy, Er and Yb increased. Although no decrease of pH was observed, it was assumed that the REEs and Al were dissolved from the soil solid phase due to H+ release from the plant roots for K+ and Ca2+ uptake. Subsequently, the bioaccumulation of REEs in the soybean roots was observed in the maturing stage of the soybean. These results showed that the soybean roots could enhance the dissolution of REEs from the soil solid phase and they also could accumulate REEs through plant growth.

DOI： https://doi.org/10.1016/j.jallcom.2004.12.102

Effect of phosphate addition on the sorption-desorption reaction on the selenium in Japanese agricultural soils

Tagami, K., and Uchida, S.、中丸　康夫

Chemosphere, 63, 109-115 (2006) 2006年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Desorption levels of soil-sorbed selenium (Se) were studied by adding phosphate to 22 typical Japanese agricultural soils. Soil-soil solution distribution coefficients of Se (Kd-Se) were measured using a batch process as an index of Se sorption level, adding 75Se as a tracer. After the Kd measurement, extraction of soil-sorbed 75Se with a 0.1 M or 1 M Na2HPO4 solution followed to determine the amount of 75Se desorbed by the phosphate. When the 0.1 M Na2HPO4 solution was used, 18-70% of soil-sorbed Se was extracted (average: 47%). However, when the 1 M Na2HPO4 solution was used, 27-83% of soil-sorbed Se was extracted (average: 57%). The observed 75Se desorption percentage indicated the maximum Se removability by phosphate addition. The desorption percentage of Se with 1 M Na2HPO4 correlated with Kd-Se values, suggesting that the soil sample with higher Kd-Se contained more reactive components for phosphate-sorption than the soil sample with lower Kd-Se. To evaluate the effect of phosphate concentration on the Se sorption, the Kd-Se was measured for two typical soils under different levels of phosphate (0.1-10 mM PO4). The Kd values were decreased by phosphate addition for both soils. The Kd decrease was observed even for just 1 mM PO4. The phosphate addition with 1 mM PO4 is the same level as in P fertilizer applied to paddy fields in Japan. Therefore, it was suggested that Se desorption should occur in Japanese soils due to the phosphate input.

DOI： doi.org/10.1016/j.chemosphere.2005.07.046

Sorption behavior of antimony in Japanese agricultural soil

Keiko Tagami, Shigeo Uchida、中丸　康夫

8th International Conference on the Biogeochemistry of Trace Elements 2005年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Antimony (Sb) is a natural occurring trace element in most soils, and is likely to be a pollutant in industrial environment. Important sources of Sb pollutions are emissions of smelters and vehicle emissions. Ainsworth and Cooke (1990) reported that Sb tended to concentrate in surface soils near a smelter. Toxicity of Sb to plants can be affected by its bioavailability in soil (Wolfram et al., 2000). However, there are not many reports on the sorption behaviour of Sb in soils. Soil-soil solution distribution coefficients (Kds) are often used to predict the mobility of an element in soil, which is defined as “concentration of an element in or on the soil solid phase” divided by “concentration of the element in the soil solution.” In this study, the Kd-Sb values were obtained for 110 Japanese agricultural soils by the batch technique using 124Sb as a tracer. In addition, the sorbed 124Sb was extracted from soils with NH4NO3 in order to evaluate its mobile and/or bioavailable fractions.

Antimony mobility in Japanese agricultural soils and the factors affecting antimony sorption behavior.

Tagami, K., and Uchida, S.、中丸　康夫

Environmental Pollution,141,321-326 (2005) 2005年08月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Mobility of antimony (Sb) in Japanese agricultural soils was studied by radiotracer experiments using 124Sb tracer. The soil- solution distribution coefficients (Kds) of Sb were measured for 110 soil samples. These Kds ranged from 1 to 2 065 L kg-1; the geometric mean was 62 L kg-1 excluding one extremely high value, 2 065 L kg-1. Experimental measurement of Kds showed a decrease with both increasing pH and increasing phosphate concentration. The latter suggested that one aspect of the Sb sorption phenomena in Japanese soil was influenced by specific adsorption ofanions such as phosphate. However, other aspects could not be explained by this specific adsorption mechanism, because only 20-40% of soil-sorbed Sb could be extracted by phosphate solution.

DOI： https://doi.org/10.1016/j.envpol.2005.08.040

Depletion of selenium in soil solution due to its enhanced sorption in the rhizosphere of soybean

Tagami, K., and Uchida, S.、中丸　康夫

Plant and Soil,278, 293-301 (2005) 2005年06月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The effect of plant roots on selenium (Se) mobility in soil was studied by a large-scale pot experiment in order to understand the environmental behavior of Se in agricultural soils under plant growth conditions. Soybean plants (Glycine max (L.) Merrill) were grown in a greenhouse for 84 d. The concentrations of Se and major elements (K, Ca, Mg, Na, and Al) in the soil solutions and in the plants were measured at different growth periods. Concentrations of Se and major cations in soil solution decreased as the soybean plants grew, while the concentrations of Al increased. It was assumed that the soybean roots released H+ with the uptake of cations; consequently, due to the acidification of the rhizosphere, Al3+ was released starting from the soil solid phase. The decreased Se concentration in the soil solution should be due to the enhancement of Se sorption onto the soil solid phase.
The increase of Se sorption level in the rhizosphere was examined in a small-scale pot experiment. The soil-soil solution distribution coefficient of Se (Kd-Se) was observed as an index of Se sorption level. Kd-Se clearly increased in the rhizosphere soil after cultivation. The effects of pH and Al3+ in the rhizosphere on Se sorption were assessed by Kd-Se measurements at different levels of HCl and AlCl3. In this third experiment, a decrease in pH increased Kd-Se values, but no specific effect was observed on Se sorption due to increased Al3+.
These results show that the Se mobility in agricultural soil could be decreased by plant roots under plant growth conditions due to enhanced Se sorption in the rhizosphere.

DOI： link.springer.com/article/10.1007/s11104-005-8769-5

Distribution coefficient of selenium in Japanese agricultural soils

Tagami, K., and Uchida, S、中丸　康夫

Chemosphere,58, 1347-1354 (2005) 2005年05月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In order to evaluate the selenium (Se) sorption level in Japanese soils, soil/soil solution distribution coefficients (Kds) were obtained for 58 agricultural soil samples (seven soil classification groups) using 75Se as a tracer. Although several chemical forms of Se are present in agricultural fields, selenite was used, because it is the major inorganic Se form in acid soils such as found in Japan. The Kd values obtained covered a wide range, from 12 to 1060 L kg-1, and their arithmetic mean was 315 L kg-1. Among the soil groups, Andosols had higher Kd values. The Kd values for all samples were highly correlated with soil active-aluminum (Al) and active-iron (Fe) contents. Thus, active-Al and active-Fe were considered to be the major adsorbents of Se. Then, a new sequential extraction procedure was applied to 12 soil samples in order to quantify the effect of soil components on Se adsorption. The sequential extraction results showed that 80-100% of the adsorbed Se was recovered as Al-bound Se and Fe-bound Se. The amount of Al-bound Se was the highest in the soils that showed high Kd values, though the relative contribution of Fe-bound Se tended to increase with decreasing Kd values. The high values of Kd seemed to be caused mainly by the adsorption of Se onto active-Al in Japanese soils.

DOI： doi: 10.1016/j.chemosphere.2004.09.086.

ダイズ根圏におけるAlの濃度変化に対する養分吸収の影響

中丸康夫・内田滋夫

日本土壌肥料学雑誌, 76, 15-20 (2005) 2005年02月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

Pot cultivation experiment of soybean was carried out using volcanic ah soil (Andosol) in order to evaluate the effect of plant growth stage on the changes in chemical properties of the rhizosphere. Soybean was sown into 12 pots and three pots were left unplanted. Soybean plants were grown in greenhouse for 84 days. To evaluate the mass flow of element, transpiration was calculated by the weight of the planted pots and the unplanted pots. Plant and soil solutions were sampled at each growth stage. The concentrations of K, Ca, Mg,, Na and Al in the plants and the soil solutions were monitored. The uptakes of all elements were exceeded in the podding stage of soybean. The concentrations of Al were increased with soybean growth while the concentrations of Ca and K were decreased. The concentrations of Ca and K were correlated negatively with the concentrations of Al. The exchangeable Al content in the soil was increased after the cultivation. These results suggest that the soil Al solubility was increased by plant growth because the soybean roots released proton with the uptake of nutrient cation. In order to verify the relationship between the concentrations of elements in the soil solution and their uptake by the plant, the ratio of an actual uptake and mass flow was calculated. The ratio of an actual uptake and mass flow for Al was 1.1-1.4 in the vegetative growth stage, and increased to 2.1-7.3 at the podding stage. This suggest that the mass flow of Al was excess of what is absorbed by the plants, leaded the accumulation near the root surface. It can be considered that the accumulation of Al in the rhizosphere was higher in the podding stage than in the vegetative growth stage by increased uptake of nutrient cations.

DOI： https://doi.org/10.20710/dojo.76.1_15

Effect of phosphate addition on the desorption of Se from soil

Keiko Tagami, Shigeo Uchida、中丸　康夫

Proceedings of Waste Management Symposium 2005年02月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Desorption levels of soil-sorbed Se by adding phosphate (P) ion were studied for 10 typical Japanese agricultural soils. Soil-solution distribution coefficients of Se (Kd-Se) were measured using the batch technique as an index of Se sorption level in the batch process, Se-75 was added to the soils as a tracer. After the Kd measurement, added Se-75 was extracted by a 0.1 M or 1 M Na2HPO4 solution to determine the amount of Se-75 desorbed by the P. When the 0.1 M Na2HPO4 solution was used, 18-57% of sorbed-Se was extracted into the solution (average: 41%). The percentage of Se extracted with the 1 M Na2HPO4 solution was 1.1-1.5 times higher than the percentage extracted with 0.1 M Na2HPO4 for which 27-71% of sorbed-Se was extracted (average: 50%). The observed desorption rates of Se indicated the existence of an upper limit to the Se desorption by P addition. The desorption percentage of Se increased with increasing Kd values, suggesting that the soil with higher Kd-Se contains more reactive components for phosphate-sorption than the soil with lower Kd-Se. To evaluate the effect of phosphate concentration on the Se sorption, the Kd-Se was measured for two typical soils under different levels of P (0.1-20 mM PO4). The Kd value decreased by P addition for both soils. The Kd decrease was observed even for just 0.1 mM P. The P addition with 0.1 mM P corresponded to 0.3 g P per kg dry soil, which is the same level as in phosphate fertilizer applied to paddy fields in Japan. Therefore, it was suggested that Se desorption should occur in Japanese soils due to the phosphate input.

DOI： www.sciencedirect.com/science/article/pii/S0045653505009525

土壌中元素濃度分布マッピングシステムによる放射性核種の移動性評価

内田滋夫・荻生延子・高橋知之・寺門正人・富田賢一・池田浩・黒澤直弘・中丸　康夫

日本土壌肥料学雑誌,76,421-426 (2005) 2005年01月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

In order to evaluate the environmental behavior of contaminants such as radionuclides, we collected soil samples throughout Japan and measured their characteristics. The characteristics include CEC, soil pH, exchangeable Ca and K, concentrations of major elements (e.g., Al, Fe, Mg and Mn) and trace elements (e.g., Cs, Se, Co, Th and U). The soil-soil solution distribution coefficients (Kds) of some radionuclides were also determined in our institute.
Using these data sets, a mapping system to show distributions of elements, radionuclides and related data (e.g., CEC, pH and Kd) in soil was developed, which is called as “MdsoiL”. MdsoiL is a set of databases of soil characteristics data and a mapping system to make contour maps of the data using inverse distance weighting to visualize the geographic distribution of the data. For example, the contour map of Kd values for Se (Kd-Se) is made without obtaining Kd-Se data for all Japanese soils to evaluate the mobility of Se in Japanese soils. The Kd value is defined as “concentration of an element in or on the soil solid phase” divided by “concentration of the element in the soil solution”. The contour map showed that the Kd-Se was higher in Kyushu, Kanto and Tohoku districts than those in Tyugoku, Shikoku and Kansai districts. This trend corresponded with the geographic distribution of volcanic ash soil. It is known that the Se sorption level is relatively higher in volcanic ash soils than other soil groups in Japan, because volcanic ash soils contain large amounts of active Al. Subsequently, the Se mobility differences among districts were clearly observed due to the geographic distribution of soil types. Thus, MdsoiL is a useful tool to evaluate environmental behaviors of contaminants.

DOI： https://doi.org/10.20710/dojo.76.4_421

Effect of plant growth on selenium leaching in volcanic ash soil Proceedings of 6th International Symposium on “Plant-soil interaction at low pH

Keiko Tagami, Shigeo Uchida、中丸　康夫

Proceedings of 6th International Symposium on “Plant-soil interaction at low pH 2004年08月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Selenium (Se) is an important trace element in agro-ecosystems, however, the behavior in acidic soil such as volcanic ash soil is not clear. Concentrations of Se in soil solutions of volcanic ash soils (Alic Melanudand) in pot experiments were observed in order to evaluate the mobility of Se. The pot experiment was carried out with and without soybean plants in a greenhouse for 84 days. Soil solutions were collected through plastic-porous tubes or by a centrifugation method. For the evaluation of leaching, zero-retention drainage water was also collected from the bottom of the plant pots. The plants were collected at 24, 32, 61 and 84 d intervals after sowing. The concentrations of Se, Fe, Al in these samples were measured by ICP-MS and ICP-AES.
The concentrations of Al and Fe in the soil solutions of the pots with the plants were higher than those of the control (no plants), but the concentrations of Se in the soil solutions and the drainage water showed the opposite trend. The concentrations of Se in the soil solutions were negatively correlated with the concentrations of Al. The results suggest that the increased Al activity induced by the growth of soybean roots decreased the Se leaching from the soil.

Selectivity for Sr, Cs and other alkaline and alkaline earth metals by plant roots under different growth stages

Keiko Tagami, Shigeo Uchida、中丸　康夫

Proceedings of 11th International Congress of the International Radiation Protection Association 2004年05月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A greenhouse experiment using stable elements was carried out to understand the soil-plant transfer of Sr-90 and Cs-137 at different growth stages of soybean. The concentrations of alkaline metals (Na, K, Rb, Cs) and alkaline earth metals (Mg, Ca, Sr, Ba) in plants and in soil solutions sampled at different growth periods were measured by ICP-MS and ICP-AES. The selectivity coefficient (SC), which is the ratio of actual element uptake by roots and mass flow of the element from soil solution, was calculated from measured values. The SC values of alkaline and alkaline earth metals were obtained for the vegetative growth stage (0-32 d) and podding stage (32-61d) of soybean. The concentrations of each alkaline and alkaline earth metal in the soil solution decreased with the soybean growth. The SC values of alkaline earth metals increased with the soybean growth; for example, the value for Sr at the vegetative growth stage was 1.26, and it increased to 2.06 at the podding stage. The results indicated that the soybean growth enhanced the uptake rate of Sr and the other alkaline earth metals. On the other hand, the SC values of alkaline metals decreased; e.g. the value of 0.73 for Cs in the vegetative growth stage dropped to 0.24 in the podding stage. This suggested that the decrease of K in the soil solution due to its uptake by the soybean plants increased the amount of Cs sorbed onto soil; consequently, the soil-plant transfer of Cs was inhibited by the soybean growth.

Using a sequential extraction procedure for selective determination of soil-adsorbed Se

Keiko Tagami, Shigeo Uchida、中丸　康夫

Proceedings of Waste Management Symposium 2004年02月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

To understand Se adsorption behavior in acid soils, soil/soil solution distribution coefficient (Kd) was obtained for 58 Japanese agricultural soil samples using Se-75 as a tracer. It was found that the Kd-Se values, ranged from 12 to 1060 (arithmetic mean =315), were highly correlated to the soil active-aluminum (Al) and active-iron (Fe) contents. Those two components were considered to be the major adsorbents of Se in Japanese soils. The mechanism of Se adsorption by the active-Al and active-Fe is regarded to be ligandexchange, which is the same adsorption mechanism for phosphorus (P). Therefore, using a modified sequential extraction procedure proposed for soil adsorbed P, the adsorbed Se-75 was extracted from 12 selected soil samples. In this procedure, we employed 1 mol L-1 NH4Cl, 4 mol L-1 NH4F and 0.1 mol L-1 NaOH for extracting loosely bound Se, active-Al bound Se and active-Fe bound Se, respectively. The results showed that 80-100% of the adsorbed Se was recovered as active-Al and active-Fe bound forms. The loosely bound Se was less than 2% of the total amount of Se sorbed on each soil. The active-Al bound Se was the dominant form in the soils that had higher Kd values, while the active-Fe bound Se was the dominant form in the soils that had lower Kd values. Therefore, we considered that the higher values of Kd-Se were mainly caused by the sorption on active-Al.

DOI： cholar.google.co.jp/scholar?q=Using+a+sequential+extraction+procedure+for+selective+determination+of

ピナツボ火山灰(1991)における黒雲母,リン灰石のバイオジオケミストリー : 火山放出物被災地における農業・植生回復の基礎査読あり

中丸康夫

東北大学大学院農学研究科博士論文　甲第7489号 2000年03月

担当区分：筆頭著者記述言語：日本語掲載種別：学位論文（博士）

Utilization of apatite in fresh volcanic ash by pigeon pea and chickpea

Nanzyo, M., and Yamasaki, S.、中丸　康夫

Soil Science and Plant Nutrition, 46, 591-600 (2000) 2000年03月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

フィリピンピナツボ火山の噴火（1992）による火山灰被災地の農業回復のため、火山灰中のアパタイトに含まれるリン酸の農業利用について検討した。その結果、火山灰中アパタイトリン酸はキマメ、ヒヨコマメなど、有機酸を分泌する植物により利用されうることが示された。

DOI： https://doi.org/10.1080/00380768.2000.10409124

新鮮火山灰に含まれるアパタイトと土壌-植物系における主な活性成分との短期間における反応性