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RISS 인기검색어
- 검색키워드
- 저자 : 홍성창(Seung-Chang Hong) (검색결과 71 건)
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홍성창 ( Hong Sung-chang ),장은숙 ( Jang Eun-suk ),허승오 ( Hur Seung-oh ),최순군 ( Chio Soon-kun ),유선영 ( Yu Sun-young ),이규현 ( Lee Gyu-hyen ),김경식 ( Kim Kyeong-sik ) 한국환경농학회 2019 한국환경농학회 학술대회집 Vol.2019 No.-
Temperature increases due to climate change are affecting various sectors of agriculture. Elevated temperatures can affect the growth and yield of crops and can also affect the utilization efficiency of nutrient input materials such as soil nutrients, chemical fertilizers, and compost. The outflow of non-point pollutant sources from farmlands is strongly influenced by physical factors such as rainfall, rainfall intensity, and slope of agricultural land. In order to simulate the outflow of non-point pollutant sources due to climate change, it is necessary to find out not only the physical factors but also the changes in the biological factors induced by the elevated temperature in detail. Temperature is one of the most important environmental factors controlling the growth and yield of plants, and the rate of reaction depends on temperature in all biological processes. Elevated temperatures increase nitrogen mineralization and net nitrification rate. The degradation, absorption, utilization, and outflow of the variety of nutrient input materials for crop cultivation can differ due to temperature rise. This study was carried out to investigate the changes of nitrogen in the nutrients of the cultivated waters by cultivating rice and maize in pots after simulating climate change and by establishing an elevated temperature environment with the chemical fertilizer and livestock compost. The elevated temperature environment was established using the modified medium open-top chamber whose width is 6m and height is 3m. The medium open-top chamber has a merit of increasing only temperature while maintaining the environmental factors such as rainfall, wind, and sunlight intensity similar as those in the field. The maximum temperature in the open-top chamber measured on the 15th of May, 2018 was higher by 2.7℃ than the field, while the average temperature was higher by 0.4℃ so that the elevated temperature could be applied to the rice and maize throughout the growth period. The rice and maize were planted in Wagner pots filled with sandy loam and clay loam, and then placed in a medium open-top chamber and grown at elevated temperatures. The analysis results of nitrogen by periodically collecting the cultivation water from the Wagner pots during the cultivation period of the rice and maize showed that the NO<sub>3</sub>―N concentration in the paddy cultivation water was decreased in the no-fertilization block, chemical fertilizer treated block, and cow dung compost treated block in the paddy cultivation sandy loam under elevated temperature compared to those in the field. Meanwhile, the NH<sub>4</sub>― N concentration was increased in the rice cultivation clay loam soil in all the treated blocks compared to the field. The NO<sub>3</sub>―N concentration in the cultivated water was decreased in all the treatment blocks in the maize cultivation clay loam soil by the elevated temperature than that of field. However, NH<sub>4</sub>―N concentration in the water from the maize cultivation sandy loam soil, as well as the clay loam soil with the chemical fertilizer, was increased by elevated temperature compared to the field. The results indicate that the nitrogen changes in the water of the paddy field and upland are induced under the elevated temperature. The outflow of the non-point pollutant sources towards the water system near the cultivation fields also can be changed by rainfall.
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온도상승 환경 처리가 논토양과 용수에서 탄소량 변화와 벼 생육에 미치는 영향
홍성창 ( Sung-chang Hong ),허승오 ( Seung-oh Hur ),최순군 ( Soon-kun Choi ),최동호 ( Dong-ho Choi ),장은숙 ( Eun-suk Jang ),( Climate Change ) 한국환경농학회 2018 한국환경농학회지 Vol.37 No.1
상승온도 처리에 따른 논토양 탄소의 변동과 벼 생육을 조사한 결과를 요약하면 다음과 같다. 소형 상부개방형 챔버를 이용하여 대기온도 보다 0.4℃, 0.5℃, 0.9℃ 상승온도 환경을 조성하여 상승온도를 처리할 수 있었다. 사각챔버의 내부온도는 대기보다 평균온도와 최고온도가 높고 최저온도는 낮은 특징을 나타내었다. 상승온도 처리구의 포트 내 표면수의 TOC 농도는 대조구 보다 상승온도 처리구에서 높았고 시간이 경과함에 따라 점차 낮아졌다. 벼 재배후 토양의 TOC함량은 대조구 보다 상승온도 처리구에서 낮았다. 상승온도 처리로 벼 식물체의 탄소함량은 감소하고 질소함량은 증가하여 C/N 율은 감소하는 경향을 나타내었다. 상승온도 처리로 대조구 보다 벼의 줄기 길이와 줄기무게가 유의하게 증가하였으나 이삭수와 벼 낱알 무게는 유의한 차이를 나타내지 않았다. BACKGROUND: The global mean surface temperature change for the period of 2016∼2035 relative to 1986~2005 is similar for the four representative concentration pathway (RCP)’s and will likely be in the range of 0.3℃ to 0.7℃. Climate change inducing higher temperature could affect not only crop growth and yield, but also dynamics of carbon in paddy field. METHODS AND RESULTS: This study was conducted to evaluate the effect of elevated temperature on the carbon dynamics in paddy soil and rice growth. In order to control the elevated temperatures, the experiments were set up as the small scale rectangular open top chambers (OTCs) of 1 m (width)×1 m (depth)×1 m (height) (Type 1), 1 m (W)×1 m (D)×1.2 m (H) (Type 2), and 1 m (W)×1 m (D)×1.4 m (H) (Type 3). The average temperatures of Type 1, Type 2, and Type 3 from July 15 to October 30 were higher than the ambient temperatures at 0.4℃, 0.5℃, and 0.9℃, respectively. For the experiment, Wagner’s pots (1/2,000 area) were placed inside chambers. The pots were filled with loamy soil, and chemical fertilizer and organic compost were applied as recommended after soil test. The pots were flooded with agricultural water and rice (Shindongjin-byeo) was planted. It was observed that TOC (total organic carbon) of the water increased by the elevated temperatures and the trend continued until the late growth stage of the rice. Soil TOC contents were reduced by the elevated temperatures. C/N ratios of the rice plant decreased by the elevated temperature treatments. Thus, it was assumed that the elevated temperatures induced to decompose soil organic matter. Elevated temperatures significantly increased the culm length (P<0.01) and culm weight (P<0.05) of rice, but the number and weight of rice panicle did not showed significant differences. CONCLUSION: Based on the results, it was suggested that the elevated temperatures had an effect on changes of soil and water carbons under the possible future climate change environment.
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홍성창 ( Seung Chang Hong ),김민경 ( Min Kyeong Kim ),김명현 ( Myung Hyun Kim ),최순군 ( Soon Kun Choe ),어진우 ( Jin Woo Eo ),정구복 ( Goo Bok Jung ),소규호 ( Kyu Ho So ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.4
BACKGROUND: Many strawberry growers are utilizing daylength extension by using incandescent bulb or fluorescent lamp to break dormancy of strawberry induced by low temperature and short day conditions. Conventional incandescent bulb and fluorescent lamp consume a lot of electricity and have short longevity. Red light known for most efficient wavelength for daylength extension light of short-day plant and long-day plant. This study was conducted to verify the effects of red light to enhance growth and to increase production of strawberry (Fragaria × ananassa Duch. cvs. “Seolhyang”) METHODS AND RESULTS: Three red light (660nm) of 0.70, 0.87, and 1.05 μmol/m2/s (PAR) and conventional incandescent bulb of 40 Lux were treated respectively under the pot experiment. All treatment irradiated from 18:00 to 24:00 for 6 hours. Red light treatment tend to increase leaf stem number, flower stem number, weight of flower stem, crown weight, root weight, and leaf area of strawberry then incandescent bulb treatment. In field experiment, red light of 0.7 μmol/m2/s (PAR) andconventional incandescent bulb of 40 Lux were irradiated respectively. Field experiment showed that the leaf number, leaf weight, and crown weight of strawberry increased than those of incandescent bulb control with red LED of 0.7 μ mol/m2/s (PAR). Red LED treatment increased the fruit number over 15g than incandescent bulb. Furthermore, red LED treatment decreased fruit number below 15g of strawberry than incandescent bulb treatment. Therefore, We believed that red LED treatment increased marketable fruit number by increment of weight of each fruit. Consequently, marketable fruit number, fruit weight, and fruit production of strawberry were increased than those of incandescent bulb by 5 %, 2.9 %, and 8.5 % respectively, but not showed significantly differences. CONCLUSION: These results presumably due to directly enhanced photosynthesis of strawberry leaves and activated action of Pfr phytochrome form by red light. In conclusion, red LED of 660nm could be used for daylength extension light source to enhance production of strawberry.
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이산화티탄과 UV-B 수준에 따른 벼 생육과 프로테옴 해석
홍성창,신평균,장안철,이기상,이철원,우선희,Hong, Seung-Chang,Shin, Pyung-Gyun,Chang, An-Cheol,Lee, Ki-Sang,Lee, Chul-Won,Woo, Sun-Hee 한국작물학회 2007 한국작물학회지 Vol.52 No.1
태양광과 반응하여 독특한 광화학적 작용을 하는 이산화티탄($TiO_2$)을 벼 잎 표면에 처리하였을 때 벼 엽신의 광합성 대사에 대한 영향을 검토하고 프로테옴 분석을 통해 생리변화를 구명하고자 수행한 결과를 요약하면 다음과 같다. 1. 광합성유효파장이 $2,400\;{\mu}mol\;m^{-2}\;s^{-1}$과 $2,200\;{\mu}mol\;m^{-2}\;s^{-1}$ 배치구에서 이산화티탄 10, 20 ppm 처리는 광적응상태의 엽록소형광지수(Yield)를 낮추었고 $450\;{\mu}mol\;m^{-2}\;s^{-1}$ 처리구는 엽록소형광지수를 높였다. 2. 노지조건인 PAR $2,400\;{\mu}mol\;m^{-2}\;s^{-1}$ 배치구에서 광합성 명반응의 상대전자전달율은 이산화티탄 10 ppm 처리에서 평균 45 %, 무처리 32.4 %, diuron 10 ppm 처리구에서 15.3%로 이산화티탄 처리는 광합성 명반응의 상대전자전달율을 높였다. 3. UV-B 4.9, $0.6\;KJ\;m^{-2}\;day^{-1}$ 배치구에서 이산화티탄 처리로 초장이 증가하였고 UV-B $0.15\;KJ\;m^{-2}\;day^{-1}$ 배치구에서 초장은 증가하고 건물중은 감소하였다. 4. 광합성은 노지의 UV-B 조건인 $13.6\;KJ\;m^{-2}\;day^{-1}$ 배치구에서 이산화티탄 처리로 종가하였고 UV-B 4.9, 0.6, $0.15\;KJ\;m^{-2}\;day^{-1}$ 배치구는 다소 증가하였으나 통계적으로 유의한 차이는 나타내지 않았다. 5. 이산화티탄 처리 후 자연광 중의 UV-B를 99% 차단하여 저수준으로 조절한 결과 68%의 단백질 발현이 감소하였고 각각 16%의 단백질 발현이 증가 또는 신생 합성되었다. 6. 이산화티탄 20 ppm 처리 후 자연광 중의 UV-B를 99% 차단시켰을 때 주로 광합성 Calvin cycle에서 $CO_2$ 결합을 촉매하는 결정구조 Rubisco의 chain E 발현이 감소하였다. Among the photoactive semiconductors such as $TiO_2,\;ZnO,\;Fe_2O_3,\;WO_3,\;and\;CdSe,\;TiO_2$ is the most widely used as photocatalyst in different media, because of its lack of toxicity and stability. In this study, the effects of titanium dioxide were investigated to obtain the information of physiological change in rice plant. Light-adapted Chlorophyll flourescence index decreased and relative electron transport rate of rice leaves was activated by titanium dioxide under $2,400\;{\mu}mol\;m^{-2}\;s^{-1}$ PAR (Photosynthetic active radiation). Relative electron transport rate of rice leaf treated with titanium dioxide 10 ppm was high in order of $2,400\;{\mu}mol\;m^{-2}\;s^{-1}\;PAR,\;2,200\;{\mu}mol\;m^{-2}\;s^{-1}\;PAR,\;450\;{\mu}mol\;m^{-2}\;s^{-1}\;PAR$ and titanium dioxide 10 ppm (45.1%), control (32.4%), diuron 10 ppm (15.3%) under $2,400\;{\mu}mol\;m^{-2}\;s^{-1}\;PAR$. Titanium dioxide increased photosynthesis of the rice leaf under $13.6\;KJ\;m^{-2}\;day^{-1}$ UV-B only. With titanium dioxide 20 ppm, reduced UV-B ($0.15\;KJ\;m^{-2}\;day^{-1}$) intensity changed the induction of proteins and twenty-five proteins were identified. Among them, seventy proteins were up-regulated, four proteins were down-regulated and four proteins were newly synthesized. Function of these proteins was related to photosynthesis (52%), carbohydrate metabolism (4%), stress/defense (8%), secondary metabolism (4%), energy/electron transport (4%), and miscellaneous (28%).
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몇가지 채소 유묘의 초기생장과 양분함량에 미치는 바이오차 효과
홍성창 ( Hong Sung-chang ),최순군 ( Chio Soon-kun ),최동호 ( Choi Dong-ho ),허승오 ( Hur Seung-oh ),신중두 ( Shin Jung-do ),장은숙 ( Jang Eun-suk ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-
Carbon sequestration, amendment on green house gas emission, and soil remediation can enhanced by the biochar. Biochar effects on soil fertility and nutrient cycling. Crops growing on the biochar applied soil could be affected on its characteristics. There are many seeding mixes for a lot of vegetable seedling. The objective of this study was to investigate the effects of biochar contents of seeding mixes on early growing of lettuce (Lactuca sative) and red pepper (Capsicum annunm), The consist of treatments were control(0 : 1, biochar ratio to seeding mixes (w/w)), 1 : 9(10%), 3 : 7 (30%), 5 : 5 (50%), and 7 : 3 (70%), respectively. The pH of mixed substrates were increased from 5.5 (control) to 8.3 (biochar 70%) depending on biochar contents, while the EC were decreased from 2.1 (control) to 0.8 (biochar 70%). As the biochar content increased in the mixed substrate, the T-N and K content were decreased. The plant length, leaf number, and dry weight of lettuce and red pepper were in order of 50%, 30%, 10%, control, and 70%. These characteristics of lettuce and red pepper seedling showed significantly differences. Increasing content of biochar (10%, 30%, and 50%) progressively activate growing of the lettuce and red pepper but at 70% treatment growing of these were retarded. As the biochar content in the mixed substrate increased T-N, P, K, Mg, and Na content of lettuce, 30 days after sowing, were increased, but Ca content not showed differences. 80 days after sowing red pepper seedling showed different nutrient content compared to those of lettuce seedling. The content of K of red pepper seedling increased depending on the biochar content but the content of P, Ca, and Mg were decreased. On the point of view nutrient content of seeding mixes, at the 50% treatment plot, the amount of nitrogen was 80% of the control, but fresh weight of the lettuce and red pepper were most heavy. Thus, it was assumed that early growing of the lettuce and red pepper seedling were affected by the action of biochar that adsorption and holding nutrient reaction in seeding mixes. In conclusion, adding the biochar to seeding mixes was considered as an important measures for growing healthy seedling and carbon sequestration. More field experiments are needed to verify the biochar effect of crop growth over the entire growing season.
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연구보문 : 식물환경 ; 적색 비닐멀칭과 흑색 비닐멀칭의 반사광 특성과 참외와 토마토의 품질과 수량에 미치는 영향
홍성창 ( Seung Chang Hong ),허정욱 ( Jeong Wook Heo ),이정택 ( Jeong Taek Lee ),강기경 ( Kee Kyung Kang ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.4
BACKGROUND: Plastic mulches widely used in raised-bed culture mainly to conserve water, control weeds and raise soil temperature. The most widely used plastic mulch colour is black. Reflective red and far-red light can affect on growth and yield of various vegetable crops. Objectives of this study were to investigate the characteristics of reflective light of black and red plastic mulches, and to evaluate the reflective red and far-red light on the quality characteristics and yield of the Oriental melon (Cucumis. Melo L.) and tomato (Lycopersicon esculentum L.). METHODS AND RESULTS: Oriental melon and tomato were cultivated over the reflective red and black plastic mulches in plastic house. Reflected red and far-red light over the red plastic mulch were 2.6 times higher than those of black plastic mulch. Red to F-Red ratio of black plastic mulch, red plastic mulch and sunlight were 1.14, 0.93 and 1.16 respectively. Intensity of reflected red and far-red light over red plastic mulch were highest at surface height of 30 cm. The higher the height of the surface decrease the intensity of far-red light. Accordingly, Red to F-Red ratio were increased. Reflective red plastic mulch increased the weight of fruit and content of sugar in Oriental melon and tomato. CONCLUSION(s): Yield of Oriental melon over reflective red plastic mulch was higher than that of black plastic mulch. These results suggested that reflected red and far-red light over the red plastic mulch affected allocation of photosynthate in growing Oriental melon.
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