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Effect of Soil Carbon Saturation Degree on Mineralization Rate of Soil Organic Carbon
So Yeong Park(박소영),Hyung Ji Song(송현지),Pil Joo Kim(김필주) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Continuous organic amendment application has been strongly recommended to improve soil quality and mitigate global warming. However, each soil has its own saturation degree which is generally decided by silt and clay content. Amended organic matter can be stabilized with stable form (i.e., mineral associated organic C) under a low soil C saturation state. However, under a high soil C saturation state, organic amendment application can increase labile organic C fraction and then might highly increase greenhouse gas (GHG) emission like carbon dioxide (CO₂) and methane (CH₄). To determine the effect of soil C saturation degree on mineralized C loss of organic amendment, the same level (4.28 Mg ha<SUP>-1</SUP>) of cover crop biomass was applied in different C saturation degrees of soils (56.4, 60.0, and 65.4%) in the rice paddy. CO₂ and CH₄ emissions were characterized during the rice cultivation period. Total mineralized C loss (CO₂-C+CH₄-C) was more highly increased with a higher soil C saturation degree. Approximately 47.43% of amended organic C was mineralized in 56.4% of C saturated soil, but it was increased to 68.04% under 65.4% of C saturation. CH₄ fraction of mineralized C loss was highly increased with increasing soil C saturation degree and then significantly increased global warming impact. Therefore, soil C saturation degree should be additionally considered in organic amendment management in the rice paddy. Under high soil C saturation, stable types of organic amendments might be recommended to increase soil C stock and decrease GHG emissions.
Comparison of Characteristic of Food Waste Composting with Various Bulking Agent
Kyung-Rai Yeom(염경래),Soo-Hun Kim(김수훈),Hyung-Ji Song(송현지),Ye-Jin Kim(김예진),Chang-Jun Sung(성창준),Hye-Min Jung(정혜민),Yun-Goo Kang(강윤규),Ji-Sun Lim(임지선),Jae-Han Lee(이재한),Taek-Keun Oh(오택근) 한국토양비료학회 2017 한국토양비료학회 학술발표회 초록집 Vol.2017 No.10