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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.
서명철,조현숙,김준환,상완규,신평,이건휘 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.1
In order to assess risk of high temperature damages about corn during reproduction stages in the future, wecarried out analysis of climate change scenarios RCP (Representative Concentration Pathway) 4.5 and RCP8.5distributed by KMA (Korea Meteorological Administration) in 2012. We established two indexes such asaverage of annual risk days of high temperature damage which express frequency and strengthen index of hightemperature damage. As results of producing maps for 157 cities and counties about average of annual risk daysof high temperature damage during total periods of scenarios, the risk of high temperature in RCP8.5 wasevaluated to increase at all over nation except inland area of Gangwon province, while RCP4.5 showed similarto present, or little higher. The maps of annual risk days of high temperature damage with 10 years interval inRCP8.5 prospected that the risk for damaging corn growth would increase rapidly from 2030’s. The largest riskof high temperature damage in the future of RCP8.5 was analyzed at Changnyeong county located east-southinland area in Kyeongnam province, while the smallest of risk counties were Pyeongchang, Taebaek, Inje, andJeongseon. The prospect at 12 counties which is large to produce corn at present and contains large plains havebeen showed that there will be only a little increase of risk of high temperature at Goesan, Yangpyeong,Hongcheon, Seosan, and Mooju until 2060’s. But considering strengthen index of high temperature damage,most regions analyzed would be prospected to increase rapidly after 2030’s. To cope with high temperaturedamage of corn in the future, we should develop various practical technologies including breeding adaptedvarieties and controlling cultivation periods.
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.
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]
서명철,성기영,조현석,김민태,박태선,강항원 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.1
In order to evaluating physiochemical properties of soil under minimum tillage and direct seeding cultivationon dry rice paddy, we conducted to analyze the soil physiochemical characteristics in treatment with 2-yearminimum tillage and dry direct seeding (2MT), 3-year minimum tillage and dry direct seeding (3MT), andtillage transplanting cultivation (TT). As results of analyzing soil organic matter (OM) contents with 2 cm soildepth of interval from surface to 30 cm, OM contents with surface soil from 0 to 2MT and 3MT were higherthan TT, recorded 34.6, 28.1 and 19.8 g kg-1, respectively. But until 20cm in soil depth, it was not so large onthe deviation of OM contents among the 3 treatments comparing with 2cm surface. Beneath 20 cm in soildepths, 2- and 3-year, OM contents in TT were distributed to be lower than 2MT and 3MT. The contents oftotal nitrogen in 2MT and 3MT were higher than the content in TT across the soil profile. Consequently,though minimum tillage and direct seeding farming is obviously the practice to saving of machinery work andlabor, other practices such as continuously input OM should be needed to achieve carbon sequestration goalthrough minimum tillage and direct seeding on dry paddy.