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경사지에서 고추 정식시기에 따른 토양유실과 유출수에 대한 식생피복 효과
조희래(Cho H.R.),하상건(S.K. Ha),현승훈(S.H. Hyun),허승오(S.O. Hur),한경화(K.H. Han),홍석영(S.Y. Hong),전상호(S.H. Jeon),김은진(E.J. Kim),이동성(D.S. Lee) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.3
As sloped farmland is subject to runoff and soil erosion and consequently require appropriate vegetative coverage to conserve soil and water, a field study was carried out to evaluate the impact of crop canopy coverage on soil loss and runoff from the experimental plot with three different textural types (clay loam, loam, and sandy loam). The runoff and soil loss were examined at lysimeters with 15% slope, 5 m in length, and 2 m in width for five months from May to September 2009 in Suwon (37° 16" 42.67" N, 126° 59" 0.11" E). Red pepper (Capsicum annum L. cv. Daechon) seedlings were transplanted on three different dates, May 4 (RP1), 15 (RP2), and 25 (RP3) to check vegetation coverage. During the experimental period, the vegetation coverage and plant height were measured at 7 day-intervals and then the "canopy cover subfactor" (an inverse of vegetation cover) was subsequently calculated. After each rainfall ceased, the amounts of soil loss and runoff were measured from each plot. Under rainfall events >100 mm, both soil loss and runoff ratio increased with increasing canopy cover subfactor (R²=0.35, p<0.01, R²=0.09, p<0.1), indicating that as vegetation cover increases, the amount of soil loss and runoff reduces. However, the soil loss and runoff were depending on the soil texture and rainfall intensity (i. e., EI30). The red pepper canopy cover subfactor was more highly correlated with soil loss in clay loam (R²=0.83, p<0.001) than in sandy loam (R²=0.48, p<0.05) and loam (R²=0.43, p<0.1) plots. However, the runoff ratio was effectively mitigated by the canopy coverage under the rainfall only with EI30<1000 MJ mm ha<SUP>-1</SUP> hr<SUP>-1</SUP> (R²=0.34, p<0.05). Therefore, this result suggested that soil loss from the red pepper field could be reduced by adjusting seedling transplanting dates, but it was also affected by the various soil textures and EI30.
황문현 ( Moon H. Hwang ),현승훈 ( Seong H. Hyun ),장남정 ( Nam J. Jang ),조재원 ( Jea W. Cho ),김인수 ( In S. Kim ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.2
Landfill leachate is one of highly contaminated and heterogeneous wastewater. The leachate from initial landfill can be treated by anaerobic process because it contains biodegradable matters, particularly, volatile fatty acids (VFAs). However, the anaerobic treatment of leachate is generally required longer hydraulic retention time (HRT) than aerobic process and another treatment process to satisfy effluent concentration. Therefore the modification of conventional anaerobic treatment is needed. Two phase anaerobic membrane process (TPAMP) is an integrated membrane process to be able to separate anaerobic metabolism into two phase which are acidogenesis and methanogenesis for improvement of anaerobic treatment efficiency. In this study, the efficiency of TPAMP and conventional anaerobic treatment were compared in terms of HRT, effluent SCOD, VFAs Membrane used in TPAMP was the UF of capillary type with the surface area of 0.048 ㎡. The average effluent SCOD of conventional anaerobic treatment was 1352 mg/L and the removal was 96 % at HRT 60 days, while in TPAMP, 927 mg/L and 98% at HRT 30 days.