Climate Change Research Institute of Korea

Gangwon, South Korea

Climate Change Research Institute of Korea

Gangwon, South Korea
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Chae H.,Kangwon National University | Chae H.,Climate Change Research Institute of Korea | Lee H.,Kangwon National University | Lee H.,Climate Change Research Institute of Korea | And 10 more authors.
Journal of Mountain Science | Year: 2012

A novel embedded sensor network records changes in key climatic-environmental variables over a range of altitude in the BaekduDaegan Mountain (BDM) of Gangwon Province in Korea, a protected mountain region with unique biodiversity undergoing climate change research. The investigated area is subdivided into three horizontal north-south study areas. Three variables, temperature (T, °C), relative humidity (RH, %), and light intensity (LI, lumens m -2, or lux, lx), have been continuously measured at hourly intervals from June, 2010 to September, 2011 using HOBO H8 devices at 10 fixed study sites. These hourly observations are aggregated to monthly, seasonal and annual mean values, and results are summarized to inaugurate a long-term climate change investigation. A region wide T difference in accordance with altitude, or lapse rate, over the interval is calculated as 0. 4°C 100 m -1. T lapse rates change seasonally, with winter lapse rates being greater than those of summer. RH is elevated in summer compared to other seasons. LI within forestland is lower during summer and higher during other seasons. The obtained results could closely relate to the vegetation type and structure and the terrain state since data loggers were located in forestland. © 2012 Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg.

Bao H.H.,Gangneung - Wonju National University | Bao H.H.,Heilongjiang Bayi Agricultural University | Tarbasa M.,Gangneung - Wonju National University | Chae H.M.,Climate Change Research Institute of Korea | You S.G.,Gangneung - Wonju National University
Molecules | Year: 2012

Four proteoglycans were sequentially extracted from Hypsizygus marmoreus using 0.1 M NaOH (alkali-soluble proteoglycans [F1] and alkali-insoluble proteoglycans [F3]) and 0.1 M HCl (acid-soluble proteoglycans [F2] and acid-insoluble proteoglycans [F4]), and their structures and immunomodulatory activities were investigated. The proteoglycans were found to contain carbohydrates (19.8-82.4%) with various amounts of proteins (7.7-67.3%), and glucose was the major monosaccharide unit present, along with trace amounts of galactose. The molecular weights (Mw) and the radius of gyration (Rg) of these proteoglycans showed ranges of 16 × 10 4-19,545 × 10 4 g/mol and 35-148 nm, respectively, showing significant variations in their molecular conformations. The backbones of F1 and F2 were mainly connected through α-(1→3), (1→4) and β-(1→6)- glycosidic linkages with some branches. The F1 and F2 proteoglycans significantly stimulated Raw264.7 cells to release nitric oxide (NO), prostaglandin E2 (PGE 2) and various cytokines, such as IL-1β, TNF-α and IL-6 by inducing their mRNA expressions. © 2012 by the authors.

Nam Y.,Korea forest Research Institute | Koh S.-H.,Korea forest Research Institute | Won D.-S.,Climate Change Research Institute of Korea | Kim J.-K.,Kangwon National University | Choi W.I.,Korea forest Research Institute
Applied Entomology and Zoology | Year: 2013

Between 2007 and 2009, field studies were conducted in four Quercus mongolica Fischer ex Ledebour forests in Korea to develop an empirical degree-day model for the flight period of the ambrosia beetle, Platypus koryoensis (Murayama). The lower developmental threshold temperature was estimated using an iterative method based on field trap catches and temperatures. The pooled proportion of the total number of beetles found in the traps at the end of the experiment was plotted against the accumulated degree-days at selected baseline temperatures, and these plots were fitted by the Weibull function. The baseline temperature with the highest coefficient of determination was considered the lower developmental threshold temperature, and this was estimated to be 5.8 °C. The explanatory power of the model was 89 %. Moreover, the model accurately predicted the time distributions of P. koryoensis flights in 2011 and 2012 at one of the sites. The estimated median flight dates in 2011 and 2012 were 4 days earlier and 5 days later than the corresponding observed flight dates, respectively. The estimated median date of flight advanced progressively during 1970-2010 by a total of 9 days due to an increase in annual mean temperature. © 2013 The Japanese Society of Applied Entomology and Zoology.

Park Y.H.,Kangwon National University | Won D.S.,Climate Change Research Institute of Korea | Jang T.W.,Kangwon National University | Chae H.M.,Kangwon National University | And 3 more authors.
Forest Science and Technology | Year: 2015

Globally, c. 0.8–1.2 million species of insects exist, with Coleoptera making up about 40% of this total. Pitfall traps for collecting ground beetles were installed at 11 study plots in Baekdudaegan mountain of Gangwon-do. Individual trapped species were counted and analyzed at each study area. This study has been carried out to provide basic data for analyzing forest health and investigating the competitive distribution among biological species in the forest environment through a field investigation on the species composition, diversity, and dominance rate of Coleoptera. Carabidae were collected using pitfall traps at the study area in Backdudaegan Mountain of Gangwon-do, and the individual number of collected species was counted. Collected ground beetles in the study area comprised 837 individuals, 14 genus, and 32 species. In this study, 217, 303, 144, and 209 individuals were found in Jinburyung, Mt. Odaesan, Mt. Taebaeksan, and Mt. Dutasan area, respectively. The abundance of ground beetles was relatively high at higher altitudes than at lower altitudes and similarity differently showed in accordance with altitudes. Eucarabus sternbergi, Aulonocarabus seishinensis, and Synuchus spp. and Pterostichus spp. (Harpalidae) were widely distributed in our study area. The diversity index of species was the highest at the Mt. Odaesan study area. © 2015 Korean Forest Society.

Nam Y.,Korea forest Research Institute | Choi W.I.,Korea forest Research Institute | Won D.-S.,Climate Change Research Institute of Korea | Kim J.-K.,Kangwon National University
Population Ecology | Year: 2013

We tested the hypothesis that the population density of ambrosia beetles at the stand level influences the spatial distribution of infested trees. We evaluated the spatial distribution of the ambrosia beetle, Platypus koryoensis (Murayama) in three oak forest stands that varied in beetle population density using a multi-year trapping survey. We used these data to inform a clustering analysis based on aggregation indices using the SADIE software. Four important findings emerged: (1) the spatial distribution pattern of P. koryoensis at the stand level changed as the population density of the beetle varied; (2) at low population densities, beetle distribution was contagious at the stand level; (3) as beetle population densities increased, the spatial distribution of infested trees became random, potentially due to beetle avoidance of mass attacked trees; and (4) at high beetle population densities, the spatial distribution of infested trees became contagious, possibly due to temporal changes in location of the attack epicenter within the stand. Our results support the hypothesis that beetle population density has consequences for the spatial distribution of infested trees at the within-stand scale. We conclude that the spatial distribution of infested trees is flexible in response to beetle population density, suggesting that beetle attack behaviors are mediated by one or more density-dependent effects. © 2012 The Society of Population Ecology and Springer Japan.

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