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충남 기후변화대응 전략개발을 위한 산림탄소상쇄 사업 활용
표정기(Jungkee Pyo),이상신(Sangsin Lee),최진하(Jinha Choi) 한국에너지기후변화학회 2016 에너지기후변화학회지 Vol.11 No.2
The purpose of this study was to evaluate the potential for activating forest carbon offset in Chungnam province. In order to propose the strategy, this study plan for short, long-term strategy on forest carbon offset. The forest carbon offset is composed of six types. The major contributor of offset project is owner of mountain, enterpriser, provincial government and the consumer was assigned enterprise of korean allowance units. It is necessary to actively cope with different motivations and institution of emission trading. So, to estimate the potential offset projects and analyzing the consumer and contributor proposed a consideration. Through thirty-year of offset project, it can be calculated 12,868 tCO₂/30yr, 3,510 tCO₂/yr carbon sequestration in forest in chungnam province. It is 0.031% of the GHG emission (41,036,591 tCO₂-eq) in Chungnam. The ration of carbon emission was showed that the afforestation/reforestation was up to 83.7% (12,868 tCO₂/yr) and forest recovery was 16%. Since the offset conducted by project basis, the results of this study can be used in potential assessment. And, it is possible to take advantage of the promotion.
Nonlinear Height-DBH Growth Models for Larix kaempferi in Gangwon and North Gyeongsang Province
Lee, Daesung,Choi, Jungkee,Seo, Yeongwan,Kim, Euigyeong Institute of Forest Science 2014 Journal of Forest Science Vol.30 No.2
This study was conducted to estimate the best-fit nonlinear height-DBH growth models for Larix kaempferi in Gangwon and North Gyeongsang province in South Korea. Exponential, Modified Logistic, Chapman-Richards, and Weibull function were used for estimating height-DBH models. To evaluate the selected models, $R^2$, RMSE, MD, MAD, and residual plots were performed in each model. Also, the coefficients and patterns in models of the previous studies were compared with those in this study. The result showed that Weibull equation was found to be the best-fit model with $R^2$=0.9837, RMSE=2.6133, MD=0.0089, and MAD=2.0896. All model parameters in our study had similar values to those in the previous models except for asymptotic parameter a. Our research result showed that Gangwon and North Gyeongsang province were superior to other provinces with regard to height growth for Larix kaempferi.
Lee, Daesung,Choi, Jungkee The Ecological Society of Korea 2022 Journal of Ecology and Environment Vol.46 No.1
Background: Korean white pine (Pinus koraiensis) is a major commercial species, and the importance of the oak trees (Quercus spp.) is increasing due to various factors such as environmental and ecological values. However, more information is required to clearly understand the growth characteristics of these species especially regarding thinning intensity. This study was performed to provide the basic information to develop the silvicultural guideline and field manual by analyzing tree and stand characteristics in line with thinning intensity in the Korean white pine plantation and oak-dominated natural deciduous forest. Results: Diameter at breast height (DBH) and volume changes by the thinning intensity in the Korean white pine plantation were significantly different from those in the oak-dominated deciduous natural forest. In particular, DBH distribution in the pine stand appeared that there were more large diameter trees as the thinning intensity was higher. DBH periodic annual increment (PAI) of the pine stand was higher as the thinning intensity was stronger and the growth period was shorter. This trend was similarly shown in the natural deciduous forest, but the amount of PAI was smaller than in pine stand. The volume PAI after thinning was not decreased over time. In each stand type, the PAI tended to be lower as stand density was higher. The volume PAI in the pine stand was significantly higher than that in the oak-dominated natural deciduous forest. Dead trees occurred the most in the unthinned plots of each stand type, and those were higher in the natural deciduous forest. Ingrowth trees were observed only in the natural deciduous forest, and its distribution was the lowest in unthinned plots; Korean white pine as ingrowth occurred the most frequently among many tree species. Conclusions: Different effects of thinning treatment on DBH and volume PAI, mortality, and ingrowth were observed for each stand. With respect to forest growth, Korean white pine plantation was superior to the oak-dominated natural deciduous forest. The results of this study offer fundamental information for the development of silvicultural guidelines for Korean white pine plantations and oak-dominated natural deciduous forests in Korea.
Estimating Wood Weight Change on Air Drying Times for Three Coniferous Species of South Korea
Lee, Daesung,Choi, Jungkee Institute of Forest Science 2016 Journal of Forest Science Vol.32 No.3
The purposes of this study are to calculate the green and dried weight using wood discs, to figure out weight change on air drying times, and to develop the model of wood disc weight change for Larix kaempferi, Pinus koraiensis, and Pinus densiflora. The variables affecting the weight change were investigated, and the pattern of weight change over time was figured out through linear models. When comparing the stem green weight calculated using wood discs in this study with the weight table of Korea Forest Service, the weight was not significantly different for L. kaempferi and P. koraiensis. On the other hand, in comparison of stem dried weight, the weight was significantly different in all of three species. In addition, various measurement factors were examined to figure out the relationship with weight change, and air drying times and disc diameter were found as significant independent variables. Finally, two linear models were developed to estimate air drying times of three species, fit statistics were significant for practical use.