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Evaluating Soil Carbon Changes in Paddy Field based on Different Fraction of Soil Organic Matter
서명철,조현숙,김준환,상완규,신평,이건휘 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6
Organic matter plays important roles in soil ecosystem in terms of carbon and nitrogen cycles. Due to recent concerns on climate change, carbon sequestration in agricultural land has become one of the most interesting and debating issues. It is necessary to understand behavior of soil carbon for evaluating decomposition or sequestration of organic matter and analyzing potential carbon decomposition pattern about the kinds of organic matter sources to cope with well. In order to evaluate decomposition of soil carbon according to organic material during cultivating rice in paddy field, we treated organic material such as hairy vetch, rice straw, oil cake fertilizer, and manure compost at 50 × 50 × 20 cm blocks made of wood board, and analyzed carbon contents of fulvic acid and humic acid fraction, and total carbon periodically in 2013 and 2014. Soil sampling was conducted on monthly basis. Four Kinds of organic matter were mixed with soil in treatment plots on 2 weeks before transplanting of rice. The treatment of animal compost showed the highest changes of total carbon, which showed 7.9 g kg-1 in May 2013 to 11.6 g kg-1 in October 2014. Fulvic acid fraction which is considered to easily decompose ranged from 1 to 2 g kg-1. Humic acid fraction was changed between 1 to 3 g kg-1 in all treatments until organic material had been applied in 2014. From May to August in the second year, the contents of humic acid fraction increased to about 4 g kg-1. The average of humic fraction carbon at treatments of animal compost was recorded highest among treatments during two years, 2.1 g kg-1. The treatment of animal compost has showed the lowest ratio of fulvic acid fraction, humic acid fraction compared with other treatments. The average ratio of fulvic fraction carbon in soil ranged from 16 to 20%, and humic fraction carbon ranged from 19 to 22%. In conclusion, animal compost including wood as bulking agent is superior in sequestrating carbon at agricultural land to other kinds of raw plant residue.
Highly Aggressive de novo Aleukemic Variant of Mast Cell Leukemia Without KIT D816V Mutation
서명철,함지연,박태인,문준호,서장수 대한진단검사의학회 2017 Annals of Laboratory Medicine Vol.37 No.6
Mastocytosis refers to a group of rare clinical disorders, in which mast cells expand abnormally and accumulate in various organs [1, 2]
기후변화에 따른 국내 벼 품종과 재배기술의 적응성에 관한 고찰
서명철,김준환,최경진,이윤호,상완규,조현숙,조정일,신평,백재경,Seo, Myung-Chul,Kim, Joon Hwan,Choi, Kyeong Jin,Lee, Yun-Ho,Sang, Wan-Gyu,Cho, Hyeon Suk,Cho, Jung-Il,Shin, Pyeong,Baek, Jae Kyeong 한국작물학회 2020 한국작물학회지 Vol.65 No.4
In recent years, the temperature of Korea has been rapidly increasing due to global warming. Over the past 40 years, the temperature of Korea has risen by about 1.26℃ compared to that in the early 1980s. By region, the west region of the Gangwon Province was the highest at 1.76℃ and the Jeonnam Province was the lowest at 0.96℃. As the temperature continues to rise, it is expected that the rice yield will decrease in the future using the current standard cultivation method. As a result of global warming, the periods in which rice cultivation could be possible in regions each year has increased compared those to the past, showing a wide variety from 110 days in Taebaek to 180 days in Busan and Gwangyang. In addition, the transplanting time was delayed by 3-5 days in all regions. The average annual yield of rice showed an increasing trend when we analyzed the average productivities of developed varieties for cooked rice since the 1980s, especially in the early 1990s, which showed a rapid increase in productivity. The relationship between the average temperature at the time of development and the rice yield was divided into the periods before and after 1996. The higher the average temperature, the lower the yield of the developed varieties until 1996. However, since 1996, the increase in the average temperature did not show a trend in the productivity of the developed varieties. The climate change adaptability of developed rice varieties was investigated by analyzing the results of growing crops nationwide from 1999 to 2016 and the change in the annual yields of developed varieties and recently developed varieties as basic data to investigate the growth status of the crops in the country. As a result of annual comparisons of the yields of Taebongbyeo (2000) and Ungwangbyeo (2004) developed in the early 2000s for Odaebyeo, which was developed in the 1980s, the annual yields were relatively higher in varieties in the 2000s despite the increase in temperature. The annual yields of Samgwangbyeo (2003) and Saenuribyeo (2007), which were recently developed as mid-late-type varieties, were higher than those of an earlier developed variety called Chucheongbyeo, which was developed in the 1970s. Despite the rapid increase in temperature, rice cultivation technology and variety development are well adapted to climate change. However, since the biological potential of rice could reach its limit, it is necessary to develop continuous response technology.
서명철,조현석,성기영,김민태,박태선,강항원,신국식 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.6
In order to evaluate drought risk at upland according to climate change scenario (RCP8.5), we have carried outthe simulation using agricultural water balance estimation model, called AFKAE0.5, at 66 weather stationsites in 2020, 2046, 2050, 2084, and 2090. Total Drought Risk Index between the first month (f) and last month(l) (TDRI(f/l)) and maximum continuous drought risk index (MCDRI(f/l)) were defined as the index foranalyzing pattern and strength of drought simulated by the model. Based on distribution maps of MCDRI(1/12), drought strength was predicted to be most severe in 2084 for all regions. Some regions showed severerisk of drought meaning over 20 days of MCDRI (1/12) in the other years, while MCDRI (1/12) in otherregions did not reach 5 days. Even though maximum value of TDRI (1/12) in 2090 was greater than in 2050,more severe drought risk in 2050 than in 2090 was predicted based on MCDRI (4/6). It implies that droughtrisk should be assessed for each crop with its own growing season.