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김동진,강다슬,안병구,이진호 한국유기농업학회 2015 韓國有機農業學會誌 Vol.23 No.3
Soil chemical properties in paddy fields were found to be varied depending upon different cultivation methods such as environmentally-friendly, conventional, and two-crop farming systems and different topographical regions, namely plain, middle mountainous, and reclaimed land regions. Overall soil pH was found to be in optimal range (pH 5.5~6.5) for rice cultivation, except with conventional cultiva-tion fields of the reclaimed lands in Jeonnam province. Electrical conductivity (EC) was relatively higher in the two-crop cultivation fields than in others. How-ever, the concentrations of available phosphate as P2O5 were exceptionally higher in the two-crop farming fields, thus in submerged paddy condition the phosphate could be released into streams and rivers. Soil organic matter (SOM) contents were mostly in optimal range (25~30 g kg-1) for paddy field in Jeonbuk province, but in Jeonnam province they were slightly higher values of the range. The concentra-tions of available silicate (SiO2) were mostly depended on the cultivation methods and the region, but some of paddy fields contained extremely high SiO2 concentra-tion. Statistical relationships among the soil chemical properties showed as follows: Correlations between EC values and exchangeable cation concentrations, between SOM contents and CEC values, and between available SIO2 concentrations and pH, EC, exchangeable cations, and CEC values were positively significant, whereas total nitrogen concentrations were significantly negatively correlated with the concentrations of exchangeable K and Mg. These results might be very useful to establish benchmark paddy fields contained with certain levels of soil fertility.
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김동진,강다슬,안병구,이진호 한국유기농업학회 2015 한국유기농업학회지 Vol.23 No.3
Soil chemical properties in paddy fields were found to be varied depending upon different cultivation methods such as environmentally-friendly, conventional, and two-crop farming systems and different topographical regions, namely plain, middle mountainous, and reclaimed land regions. Overall soil pH was found to be in optimal range (pH 5.5~6.5) for rice cultivation, except with conventional cultivation fields of the reclaimed lands in Jeonnam province. Electrical conductivity (EC) was relatively higher in the two-crop cultivation fields than in others. However, the concentrations of available phosphate as P2O5 were exceptionally higher in the two-crop farming fields, thus in submerged paddy condition the phosphate could be released into streams and rivers. Soil organic matter (SOM) contents were mostly in optimal range (25~30 g kg-1) for paddy field in Jeonbuk province, but in Jeonnam province they were slightly higher values of the range. The concentrations of available silicate (SiO2) were mostly depended on the cultivation methods and the region, but some of paddy fields contained extremely high SiO2 concentration. Statistical relationships among the soil chemical properties showed as follows: Correlations between EC values and exchangeable cation concentrations, between SOM contents and CEC values, and between available SIO2 concentrations and pH, EC, exchangeable cations, and CEC values were positively significant, whereas total nitrogen concentrations were significantly negatively correlated with the concentrations of exchangeable K and Mg. These results might be very useful to establish benchmark paddy fields contained with certain levels of soil fertility.
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김대환,김은주,강다슬,박성권 한국부동산연구원 2017 부동산연구 Vol.27 No.2
Under the circumstance that the proportion of real assets among whole household assets is high and the roles of real assets play are not only limited to residence but extended to investment in Korea, the economy of the real estate is essential to individual perspectives as well as macroeconomic point of view. Whereas priori studies related with the real estate have focused on macroeconomic perspectives or estimating the real estate cycles, there is little studies the association between the real estate and individual mental health. By applying the correlated random effect lodit model to Korea Health Panel of 2008~2013, this study investigates whether the house price affects individual’s mental health or not. Further, we examine the hypothesis that the house price would affect differently between the individuals who own a house and those who do not. The empirical results show that the likelihood of experiencing depression for house owners decreases when a house price increases and such association between the house price and depression is not detected for tenants. The results of this study imply that the government’s intervention to avoid hard landing of the real estate market would be positive for people’s mental health as well as macro-economy. 전체 가계자산 중 부동산 비중이 높을 뿐만 아니라 부동산을 거주의 개념을 넘어 투자의 주요 도구로 접근하고 있는 우리나라의 상황에서, 부동산경기는 거시경제적 차원을 넘어 개인차원에서도 매우 중요하다. 하지만 부동산과 관련한 선행연구는 주로 거시경제적 차원에서 주로 이루어졌거나 부동산시장을 전망하는 연구가 주를 이루고 있을 뿐, 주택의 가격변화가 개인의 정신건강에 미치는 영향에 대한 연구는 국내외적으로 전무하다. 본 연구는 한국의료패널의 2008~2013년 자료를 활용해 주택가격의 상승 또는 하락에 따른 정신적 건강상태의 변화를 CRE Logit모형으로 분석했다. 특히 주택가격의 변화가 정신건강에 미치는 영향이 주택의 소유여부에 따라 다를 수 있다는 가정 하에 주택소유자와 비소유자로 샘플을 구분하여 분석하였다. 분석 결과, 주택가격이 상승할 경우 주택소유자는 우울감을 경험할 가능성이 감소하는 반면 비소유자의 우울감 경험 가능성은 주택가격과 무관한 것으로 나타났다. 부동산시장의 악화나 경착륙을 방지하기 위한 노력들이 거시경제차원 뿐만 아니라 국민들의 정신건강 차원에서도 긍정적일 수 있음을 시사한다.
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