Showing papers by "Korea Forest Service published in 2017"

Forest aesthetic indicators in sustainable forest management standards

Abstract: Sustainable forest management (SFM) standards have been criticized for their lack of aesthetic indicators, which some consider to be an important social component of forestry. To provide a basis fo...

Biotransformation of fatty acid-rich tree oil hydrolysates to hydroxy fatty acid-rich hydrolysates by hydroxylases and their feasibility as biosurfactants

Abstract: The fatty acid compositions of 10 types of tree oils were analyzed and Camellia japonica (CJ), Tetradium daniellii (TD), and Hovenia dulcis (HD) tree oils were selected to be oleic acid (OA)-, linoleic acid (LA)-, and α-linoleic acid (ALA)-rich tree oils, respectively. Recombinant Escherichia coli expressing 10-hydratase and 7,8-diol synthase converted 31.7 and 15.6 g/L unsaturated fatty acids (UFAs) in OA-rich oil hydrolysates to 21.7 g/L 10-monohydroxy fatty acid (monoHFA) and 13.3 g/L 7,8-diHFA, respectively. The cells expressing 13-hydratase, 13-lipoxygenase, 5,8-diol synthase, and 8,11-diol synthase converted 42.8, 28.5, 10.0, and 20.0 g/L UFAs in LA-rich oil hydrolysates to 28.2 g/L 13-monoHFA, 11.8 g/L 13-monoHFA, 7.2 g/L 5,8-diHFA, and 8.9 g/L 8,11-diHFA, respectively. The cells expressing 8,11-diol synthase converted containing 17.5 g/L UFAs in ALA-rich oil hydrolysate to 7.5 g/L 8,11-diHFA. The average emulsifying activities of diHFArich and monoHFA-rich tree oil hydrolysates were 13.9- and 4.3-fold higher than those of tree oil hydrolysates, respectively. Thus, HFA-rich tree oil hydrolysates derived from tree oils can be applied as biosurfactants, and the fatty acid-rich residue as by-product obtained from the tree refinery process may be recycled into biosurfactants.

Evaluation of stem taper models fitted for Japanese cedar (Cryptomeria japonica) in the subtropical forests of Jeju Island, Korea

Abstract: This study was conducted to evaluate the performance of the five stem taper models in predicting the diameter over bark at any given height (d) and total volume of Japanese cedar (Cryptomeria japonica D.Don) in the subtropical forests of Korea. The four fit statistics used in this study were standard error of estimate (SEE), mean bias (), mean absolute bias (MAB), and coefficient of determination (R2). For the lack-of-fit statistics, SEE, MAB, and of the five models in predicting d in the different relative height classes and in predicting the total volume in the different diameter at breast height (D) classes were determined. Results of the model evaluation indicated that the Kozak88 stem taper model had the best performance in most of the fit statistics followed by Kozak02 stem taper model. The Kozak88 model also provided the best performance in the lack-of-fit statistics having the best SEE, MAB, and in predicting d in most of the relative height classes. This model consistently performed well ...

First retrieval of fire radiative power from COMS data using the mid-infrared radiance method

Abstract: Fire radiative power (FRP), which is the power radiated by fire within a unit area, is a fundamental component for estimation of fire emissions. Successive information of FRP is provided by instruments on geostationary satellites, such as the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on board Meteosat, and the Imager on board Geostationary Operational Environmental Satellite (GOES) for Europe, Africa and America. In East Asia, however, the geostationary satellites such as Multifunctional Transport Satellite, Himawari, Fengyun, and Communication, Ocean and Meteorological Satellite (COMS) do not provide official FRP products yet. This article describes the first retrieval of COMS FRP using the mid-infrared radiance method with an optimal sensor coefficient derived from our experimental simulations. The COMS FRP retrievals were compared with Moderate Resolution Imaging Spectroradiometer (MODIS) FRP products in East Asia for each April during 2011–2014. The mean absolute percentage differ...