토양 비소 오염원의 종류가 봉의꼬리의 생육 및 비소 축적에 미치는 영향
Effect of Arsenic Types in Soil on Growth and Arsenic Accumulation of Pteris multifida
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비소의 종류에 따른 봉의꼬리의 생육 반응 및 비소 축적능을분석하기 위해 sodium arsenate, calcium arsenate, sodiumarsenite 및 potassium arsenite 등의 4종류를 선정하여 500㎎·kg-1의 농도로 토양에 처리하여 봉의꼬리를 12주간 재배하였다. 그 결과, calcium arsenate 처리구의 봉의꼬리 생육은 다소감소하였으나, 나머지 비소 처리구에서는 무처리구에서 재배한 생육과 비슷하였다. Sodium arsenate 처리구의 봉의꼬리 지상부는 4주의 단기간 재배만으로 2,289.5 ㎎·kg-1 DW의 높은 비소 축적능을 보였으며, 12주에는 비소 축적능이 2,956.0 ㎎·kg-1DW로 더욱 증가하였다. 반면, 지하부는 potassium arsenite 처리구에서 2,470.2 ㎎·kg-1 DW로 가장 높았으며, calciumarsenate 처리구는 1,060.7 ㎎·kg-1 DW의 비소를 축적하였다. 봉의꼬리 지상부의 비소 축적능은 비소의 종류에 관계없이1,000 ㎎·kg-1 DW 이상으로 매우 우수하였다. 그리고 토양의 비소 제거량도 높았다. 따라서 봉의꼬리는 다양한 비소 오염 지역의 식물상 정화기법 소재로 활용이 가능할 것으로 생각된다.
Abstract
This study was carried out to analyze the effect of arsenic types on growth and arsenic accumulation ability of Pteris multifida. Among arsenic pollution sources, Sodium arsenate, Calcium arsenate, Sodium arsenite and Potassium arsenite were treated in horticultural compost contaminated with 500 ㎎·kg -1 . P. multifida was cultivated for 12 weeks. The results of study, Calcium arsenate treatment showed slightly decreased growth of P. multifida. But, growth of P. multifida cultivated in the remaining arsenic treatment was similar to untreated control plot. With only short-term cultivation of 4 weeks, aerial part of P. multifida in Sodium arsenate treatment showed high arsenic accumulation of 2,289.5 ㎎·kg -1 DW. The arsenic accumulation (2,956.0 ㎎·kg -1 DW) was the highest at 12 week. On the other hand, underground part showed the highest arsenic accumulation in Potassium arsenite treatment (2,470.2 ㎎·kg -1 DW) and Calcium arsenate treatment accumulated 1,060.7 ㎎·kg -1 DW of arsenic. Regardless of arsenic types, aerial part of P. multifida was absorbed more than 1000 ㎎·kg -1 DW of arsenic. And removal of arsenic in soil was also higher. Therefore, Pteris multida is considered to be suitable phytoremediation meterial of various arsenic contaminated areas.
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