유역 내 토지이용도에 따른 N2O 배출양상

Abstract

The gaseous product of nitrogen cycle, nitrous oxide (N2O) is a potent greenhouse gas whose Global Warming Potential (GWP) is about 300 times greater than CO2. The dynamics of N2O emission are controlled by such environments and soil conditions. The main aim of this study is to investigate variations of N2O emission and its controlling factors with different land-use patterns in Haean basin. A forest, a radish field and a rice paddy were selected as three different land-use patterns. Their N2O emissions were measured every month during a growing season. We also collected soil samples with seasons and analyzed soil characteristics including inorganic nitrogen content. N2O emission was greatest at the radish field likely due to anthropogenic nitrogen addition by fertilization. Soils of forest and rice paddy also contained inorganic nitrogen originated from organic matter. However, the spatial variation was great and it looks that nitrogen cycle and N2O production were slower than that of radish field. Intensive observation and control of fertilization would be requiredto adjust N2O emission from agriculture soils.