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이선일 ( Sun-il Lee ),임상선 ( Sang-sun Lim ),딘비홍 ( Dinh-viet Hung ),이동석 ( Dong-suk Lee ),이광승 ( Kwang-sung Lee ),박래성 ( Re-sung Park ),박연주 ( Yeon-joo Park ),윤광식 ( Kwang-sik Yoon ),최우정 ( Woo-jung Choi ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-
Floating plant system can remove phosphorus (P) from water via plant absorption of P. As fly ash (FA) is a good phosphorus (P) adsorbent, using FA as a medium for the floating plant system may enhance P removal. In this study, the effect of FA mixture on P removal was investigated through an experiment using box planted with rice (Oryza sativa L.). Sand mixed with 0 (code FA0), 25 (FA<sub>25</sub>), and 50% (FA<sub>50</sub>) of FA (w/w) was placed into the box (21 cm × 16 cm × 8 cm) and the box was floated on container (8 L) filled with P-contaminated water (3 mg P L<sup>-1</sup> as KH<sub>2</sub>PO<sub>4</sub>). Totally 24 mg of P was added into the container. On 7 days after treatment, chlorophyl-a concentration was 0.20 mg L<sup>-1</sup> for FA<sub>0</sub>, 0.05 mg L<sup>-1</sup> for FA<sub>25</sub>, and 0.04 mg L<sup>-1</sup> for FA<sub>50</sub>, indicating suppression of algae growth. On the same day, concentration of total P was 3.3, 2.7, and 2.3 mg P L<sup>-1</sup> for FA<sub>0</sub>, FA<sub>25</sub>, and FA<sub>50</sub>, respectively, suggesting that the suppression of algae growth by FA application is linked with decrease in P concentration. At the end of experiment (20 days after treatment), removal efficiency of P for FA<sub>0</sub> was as high as 84.8% and this was ascribed to rice uptake and P adsorption by sand. In FA treatment, the removal efficiency increased to 95.8% for FA<sub>25</sub> and 95.7% for FA<sub>50</sub>. Therefore, it was suggested that FA can be used as a plant growth medium in floating plant system for enhanced removal of water P.
나이테 Ca/Al를 이용한 남부지역 소나무 산림의 토양 산성화 이력 평가
이광승 ( Kwang-seung Lee ),딘비흥 ( Dinh Viet Hung ),임상선 ( Sang-sun Lim ),이계한 ( Kye-han Lee ),최우정 ( Woo-jung Choi ) 한국농공학회 2011 한국농공학회 학술대회초록집 Vol.2011 No.-
Soil acidification, which is known to be one of the reasons of forest decline, is associated with decreases exchangeable Ca and increases in Al concentration, leading to low Ca/Al ratio in soil solution. As tree rings are datable archives of environmental changes, Ca/Al ratios of annual growth ring may show deceasing pattern in accordance with the progress of soil acidification. This study was conducted to investigate Ca/Al pattern of Pinus densiflora tree ring in relation with the changed exchangeable Ca/Al ratios of soils with the progress of soil acidification. Three P. densiflora tree disks were collected from P. densiflora forests in Jeonnam province, and soil samples (0-10, 10-20, and 20-30 cm in depth) were also collected from the tree locations. Soils were analyzed for pH, exchangeable Ca and Al concentrations, and Ca/Al was calculated. Annual growth rings formed between 1969 and 2007 were separated and analyzed for Ca/Al. Soil Ca/Al was positively (P<0.01) correlated with soil pH, reflecting changed soil chemistry due to soil acidification. The Ca/Al of tree rings also showed a decreasing pattern from 18.2 to 5.5 during the period, and this seemed to reflect historical acidification of the soils. Our results suggest that Ca/Al of tree ring is likely to be affected by exchangeable Ca/Al ratio of the soils and thus it needs to be considered as a proxy of the progress of soil acidification in P. densiflora forest in southern Korea.