밭토양 양분과 비점오염물질 변동에 대한 상승온도의 영향

• 영문명: Effects of Elevated Temperature on Nutrient and Non-point Source Pollutant Change in Upland Soil
• 발행기관: 유기성자원학회
• 저자명: 홍성창(Sung-Chang Hong) 허승오(Seung-Oh Hur) 최순군(Sun-Gun Choi)
• 간행물 정보: 『유기성자원학회 학술발표대회논문집』2017년도 추계학술대회 발표집, 165~166쪽, 전체 2쪽
• 주제분류: 공학 > 토목공학
• 파일형태: PDF
• 발행일자: 2017.09.30

영문 초록

Climate change inducing higher temperature can affect not only crop growth, yield but also availability of soil nutrient, chemical fertilizer, and manure in agricultural field. There is little information about the effect of higher temperature on non-point source pollutant of paddy and upland field runoff. Therefore, the objective of the study was to investigate the effects of elevated temperature on nutrient and dynamic of non-point source pollutant in upland soils. Temperature treatments were consisted of ambient as a control, ambient plus 2℃ and ambient plus 4℃, respectively. Each elevated temperature controlled by ten step alternating temperature programming using incubator. Content of soil and water NH4+-N, NO3--N, total nitrogen, and total phosphorus were measured. Dissolved nitrogen (N) and phosphorus (P) of maize straw were measured additionally. Treated with ambient plus 2℃, mineralization (NH4+-N/TN) of nitrogen decreased in sandy loam soils, whereas that of clay loam soils increased compared to ambient. With ambient plus 2℃ treatment, nitrification(NO3--N) of nitrogen increased in two types of soil. Concentrations of soil phosphorus and potassium showed increasing trend with the elevated temperature. Nitrate concentrations of filtered water were higher than those of ambient. Concentrations of dissolved nitrogen (N) and phosphorus of maize straw significantly increased by elevated temperature within three to five days. Thus, it was considered that in an environment higher than current temperature, water soluble nitrogen (NO3--N) and phosphorus (PO4--P) of crop residue could be released easily by rain from the agricultural fields. Therefore, upland field scale experiments are needed under natural environment using practical open top chamber. Overall, it wassuggested that elevated temperatures have effect on acceleration of mineralization and nitrification of soil nitrogen under climate change environment.

키워드

Climate change Elevated temperature Non-point source pollutant Nutrient Upland soil