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박현진 ( Hyun-jin Park ),양혜인 ( Hye-in Yang ),최우정 ( Woo-jung Choi ),이영한 ( Young-han Lee ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
Tree foliage litter chemistry such as the concentrations of lignin (L), nitrogen (N), calcium (Ca) and manganese (Mn) plays important roles in the litter decomposition and thus carbon (C) dynamics of forest soils. It has been reported that high quality litters with high N and low L concentrations decompose fast as compared to low quality litters. However, such findings are based on the studies with different tree species such as coniferous and deciduous. Therefore, it is unknown if the effects of litter chemistry on the litter decomposition rate still valid within a species. This study was conducted to investigate the effects of litter chemistry on litter decomposition using litters with contrasting chemical properties for two functionally different species (pine and oak). To collect foliage litter samples with contrasting chemistry, trees were grown under different CO2 concentration, air temperature and soil water and nutrient availability for two years. Four treatments with two litter type and two species were laid out in triplicates. Soils treated with litters were incubated for 45 days and CO2 emission was monitored. At the end of incubation, the microbial community structure was determined by the analysis of easter-linked fatty acid methyl esters (FAMEs). Cumulative CO2 emission was higher for oak than pine litters and this collaborates with the higher litter quality of oak than pine litters such as lower L concentrations and higher Ca and Mn concentrations. However, within the species, the cumulative CO2 emission was higher for litters with lower N and higher L concentrations which is contrasting to the current understandings of the effects of litter chemistry on the decomposition. This result suggests that the current litter chemistry theory on litter decomposition are valid only to compare litter decomposition between different species but not for within the same species. Recent studies suggested that lignin is not stable as it is thought and thus more CO2 can be emitted from soils treated with high lignin litters due to the lower substrate use efficiency, the proportion of assimilated substrates which is utilized for growth relative to substrate being mineralized and respiration, of lignin as compared to other components such as cellulose. In addition, lignin decomposition decreases with increasing Nconcentration of litters as high N availability suppresses the activity of ligninolytic enzyme. The total FAMEs, bacteria and fungi were greater for soil amended with pine than oak, and this also contradicts to the current knowledge that soils of deciduous trees have higher microbial population than soils of conifers due to readily decomposability of deciduous litters. However, as indicated by the lower CO2 emission in the pine than that in oak litters amended soils, C derived from pine litters can be utilized more efficiency by microbes to increase biomass. In this context, the higher microbial populations in the deciduous tree soils than in the coniferous tree soils reported in other studies should be ascribed to the greater amount of annual litters inputs. This study highlights that the current litter chemistry theory is useful in understanding the differences in the litter decomposition between different species; however, a novel theory need to be established to understand the differences in litter decomposition within a species.
신체이미지와 쾌락적 쇼핑성향 및 스키니 진 구매 시 정보원 활용의 관계 연구
양혜인 ( Hye-in Yang ),김한나 ( Hanna Kim ) 한국패션비즈니스학회 2017 패션 비즈니스 Vol.21 No.2
This study examines the effects of body image and the hedonic shopping orientation of female consumers on using fashion information to purchase skinny jeans. For this purpose, an online survey was carried out during the recent year targeting female consumers who had purchased skinny jeans. A total of 464 responses were analyzed in this study. The SPSS 22.0 program was used to perform frequency analysis, factor analysis, reliability analysis, and multiple regression analysis. The results are as follows. First, interest in appearance and apparel had a significant influence on every factor of the hedonic shopping orientation, except for the relational shopping orientation, and interest in body weight had a significant effect on the enjoying, relational, and impulsive shopping orientations. Additionally, body satisfaction, except for the impulsive shopping orientation, had a significant influence on the enjoying, brand, loyalty, and relational shopping orientations; body dissatisfaction affected the brand, loyalty, relational, and impulsive shopping orientations. Second, the enjoying shopping orientation significantly influenced every factor of fashion information, and the brand shopping orientation had a positive effect on mass media information, but a negative effect on street information. Furthermore, the loyalty shopping orientation had a significant influence only on store information, the relational shopping orientation had a significant effect on both mass media and verbal information, and the impulsive shopping orientation did not exert any influence on any factors of fashion information.