Potassium behavior and clay mineral composition in the soil with low effectiveness of potassium application
Potassium behavior and clay mineral composition in the soil with low effectiveness of potassium application
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DOI：
10.1080/00380768.2017.1419830
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发表时间：
2018-03
影响因子：
2
通讯作者：
K. Kubo;T. Hirayama;Shigeto Fujimura;Tetsuya Eguchi;N. Nihei;S. Hamamoto;M. Takeuchi;Takashi Saito;T. Ota;T. Shinano
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文献类型：
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作者：
K. Kubo;T. Hirayama;Shigeto Fujimura;Tetsuya Eguchi;N. Nihei;S. Hamamoto;M. Takeuchi;Takashi Saito;T. Ota;T. Shinano
提高土壤交换性钾（ExK）含量对缓解放射性铯向农作物的转移具有重要意义。在2011年3月东京电力公司福岛第一核电站事故后，我们重点研究了日本福岛县（A区）的荞麦（荞麦）田，尽管施用了K，但ExK含量低。为了弄清施入土壤中的钾是被淋溶还是被固定，我们对A田土壤中钾浓度与粘土矿物组成的关系进行了研究，并与福岛县的另一个田（B田）进行了比较。盆栽试验结果表明，灌水后，A田盆栽渗水中的钾浓度显著低于B田。大豆种植后土壤ExK含量A田低于B田。这些结果表明，施于农田A的钾被固定在土壤中。粘土矿物成分分析证实了A区土壤独特的蛭石性质。这种粘土矿物学与A田土壤比B田土壤具有更高的固钾能力有关。本研究表明，钾固定在蛭石是一个因素，防止增加ExK含量从施钾到外地A。
ABSTRACT Increasing exchangeable potassium (ExK) content in soil to an appropriate level is important to mitigate the transfer of radioactive cesium to crops. We focused on a buckwheat (Fagopyrum esculentum Moench) field with a low ExK content, despite the application of K, in Fukushima Prefecture, Japan (Field A), following the Tokyo Electric Power Company Fukushima Dai-ichi (No. 1) Nuclear Power Plant accident in March 2011. We examined the relationship between K concentration and clay mineral composition in the soil of Field A and compared the findings with another field in Fukushima Prefecture (Field B) to clarify whether K applied to the soil was leached or remaining fixed. Pot experiments showed that K concentration in water seepage from pots following irrigation was significantly lower in pots from Field A than in those from Field B. Soil ExK content after soybean cultivation was lower in soils of Field A than those of Field B. These results indicate that K applied to Field A was fixed in the soil. Analysis of clay mineral composition confirmed the distinctive vermiculitic nature of Field A soils. This clay mineralogy would be associated with the higher K fixation ability of Field A than Field B soils. This study demonstrated that K fixation in vermiculite was a factor preventing the increase in ExK content from K application to Field A.