• 식물분류학회지
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• 제48권1호
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• pp.100-108
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• 2018

This study presents a survey of bryophytes in a subtropical forest of Nabeup-ri, known as Geumsan Park, located at Aewol Gotjawal in the northwestern part of Jejudo Island, Korea. A total of 63 taxa belonging to Bryophyta (22 families 37 genera 44 species), Marchantiophyta (7 families 11 genera 18 species), and Anthocerotophyta (1 family 1 genus 1 species) were determined, and the liverwort index was 30.2%. The predominant life form was the mat form. The rates of bryophytes dominating in mesic to hygric sites were higher than the bryophytes mainly observed in xeric habitats. These values indicate that such forests are widespread in this study area. Moreover, the rock was the substrate type, which plays a major role in providing micro-habitats for bryophytes. We suggest that more detailed studies of the bryophyte flora should be conducted on a regional scale to provide basic data for selecting indicator species of Gotjawal and evergreen broad-leaved forests on Jejudo Island.

• 한국환경복원기술학회지
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• 제18권1호
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• pp.53-69
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• 2015

Plants and birds have symbiotic relationship as the birds eat the fruits and disperse its seeds from the different places. Because Brown-eared Bulbul eats various fruits, We investigated the fruits consumed by Brown-eared Bulbul and the distribution of these seeds. Surveys were conducted at several area throughout Jeju Island at least twice a month from 2013 to 2014. We identified the fruits consumed by Brown-eared Bulbul through observation, pictures and interviews from the local residents. Results showed that this species consumed fruits from 82 plant species, belonging to 38 plant families. Thirty nine percent(39%) of these plant species belong to the Rosaceae, Lauraceae, Moraceae, Aquifoliaceae and Vitaceae and 33 species were classified as warm-temperate and subtropical plant which is 40% of the total plant species consumed. Two feeding types, which were gulper type and pecking type were observed for the Brown-eared Bulbul. It was also observed that this species preferred eating fruits of gulping type compared to that of pecking type. The average size of the fruits consumed through gulping was $8.92{\pm}3.41mm$ while it was $45.25{\pm}26.67mm$ for the pecker type. This bird species also consumed more fruits with globular shape compared to those of fruits with ellipse shape. For the fruit color, red and black-colored fruits were more preferred than yellow-colored fruits by Brown-eared Bulbul. Eaten frequency varied from 0.04 to 0.58 and the 10 fruits species were eaten frequently by Brown-eared Bulbul. This study would provide information for the role of Brown-eared Bulbul in the ecosystem as a seed dispersal agent.

• Journal of the Korean Wood Science and Technology
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• 제49권5호
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• pp.482-490
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• 2021

This research was conducted to analyze the sound absorption effect of air-dried leaves from two evergreen tree species found in Korea's warm-temperate and subtropical regions. As eco-friendly sound absorption materials, Dendropanax morbiferusa, and Fatsia japonica leaves were prepared in three specimen units sizes 0.5 × 0.5 cm², 1.0 × 1.0 cm², and 2.0 × 2.0 cm², and each of them was formed at a thickness of 1.00 cm, 1.75 cm, and 2.50 cm. The measured sound absorption coefficients (SAC) for 18 conditions were comparatively analyzed in this study. The SAC of both tree species was significantly improved by increasing the dried leaf layer thickness. These results showed a more consistent and distinct trend for both tree species under the condition of 0.5 cm² in dried leaf size compared to other leaf specimen sizes. However, as the thickness increased, the difference in sound absorption effect according to the leaf size tends to decrease overall. In the case of D. morbiferus, there was no significant difference in SAC based on leaf size under the condition of 2.5 cm thickness (p < 0.05). The highest mean SAC was found in a 2.5 cm thick condition with a leaf size of 0.5 × 0.5 cm², 0.549 for D. morbiferusa, and 0.594 for F. japonica, respectively.

• 한국산림과학회지
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• 제111권4호
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• pp.613-621
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• 2022

본 연구는 5차, 6차, 7차 국가산림조사 자료 중 아까시나무가 우점종인 표본점을 수집하여, 산림조사 차수별, 기후대별(온대 북부, 온대중부, 온대남부, 난대지역), 해발고별(100 m 단위) 흉고직경, 입목본수, ha당 재적 및 지위지수의 변화를 구명하고자 하였다. 또한 용재로서 사용을 위한 기준인 벌기령을 산정하였다. 그리고 변화 구명은 통계처리 기법 중 분산분석과 Duncan 검정으로서 이행하였다. 흉고직경의 변화를 보면, 당연히 산림조사 차수에 따라 증가하였고, 기후대별로는 온대남부 지역에서 가장 생장이 좋지 않았으며, 해발고별로는 301-400 m 지점에서 가장 생장이 떨어지는 것으로 나타났다. ha당 입목밀도는 산림조사 차수별, 해발고에 따라서 서로 간 차이를 보이지 않았으며, 온대중부 지역에서 밀도가 가장 높고, 온대남부 지역이 가장 낮은 밀도를 보였다. ha당 임분재적은 산림조사 차수에 따라 증가하였고, 온대북부·온대중부 지역과 온대남부·난대 지역으로 크게 두 그룹으로 구분되며, 해발고 201-300 m에서 재적생장량이 가장 높았다. 지위지수는 ha당 임분재적 변화와 유사한 결과를 보여 주었다. 그리고 아까시나무의 ha당 재적변화를 알 수 있는 생장량 곡선은 Weibull 함수식으로 추정하였으며, 임분재적은 임령 50-60년에 이를 때 약 200 m³에 달할 것으로 예측되었다. 아까시나무를 밀원 자원이 아닌 용재로 이용하기 위한 기준인 재적수확최대벌기령을 계산한 결과 34년으로 나타났다.

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2009년 학술대회 논문집
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• pp.93-96
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• 2009

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2003년도 추계학술논문발표회 논문집
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• pp.136-139
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• 2003

• 한국환경생태학회:학술대회논문집
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• 한국환경생태학회 2002년도 정기총회 및 학술논문 발표회
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• pp.89-91
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• 2002

• Journal of the Korean Wood Science and Technology
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• 제48권5호
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• pp.631-640
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• 2020

In this study, the effect of specimen size and layer thickness on the sound absorption of the leaves of two evergreen broad-leaved tree species, Dendropanax morbiferus and Fatsia japonica, was investigated. The specimen sizes of 0.5 × 0.5, 1.0 × 1.0, and 2.0 × 2.0 ㎠ and layer thicknesses of 1.00, 1.75, and 2.50 cm were considered. At the layer thickness of 2.5 cm, the leaf of the D. morbiferus showed no significant difference in sound absorption coefficients (SACs) as the sample size varied, however, a significant change in SACs was recorded in that of the F. japonica. At 1.0-cm thickness, the SACs of the F. japonica leaf varied more remarkably with the sample size. The 2.50-cm-thick F. japonica leaf with the specimen size 0.5 × 0.5 ㎠ exhibited the highest sound absorption effect among all samples investigated.

• 한국산림과학회지
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• 제112권4호
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• pp.417-425
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• 2023

본 연구는 난대상록수종인 붉가시나무에 대한 수간곡선을 도출하고 이를 이용하여 수간재적표를 작성하기 위함이 그 목적이다. 분석에 사용된 공시목은 전남, 경남, 제주 등에서 수집된 688본이며, 수간곡선 도출을 위하여 적용한 수간곡선 모형은 Max & Burkhart 모델, Kozak 모델 및 Lee 모델 등이다. 3가지 모델 중 우리나라 붉가시나무 수간형태를 가장 잘 설명하는 것은 Kozak 모델인 것으로 분석되었다. 이 모델의 적합도는 0.9583, 편의는 0.0352, 추정치 표준오차의 백분율은 1.1439, 평균절대편차는 0.6751로 각각 나타났다. 붉가시나무의 수간재적표는 수간곡선을 설명하는데 최적인 것으로 나타난 Kozak 모델을 이용하였으며, 재적 계산은 수간고별 직경으로 Smalian 식을 적용시켜 산출하였다. 그리고 이전에 만들어진 붉가시나무 수간재적표 2가지(2007년, 2010년)와 이번에 만든 재적표(2023년) 간을 서로 비교하기 위해 분산분석을 실시하였다. 그 결과 2007년 완도지역에서 만든 재적표가 2010년과 2023년에 만든 재적표 보다 약 2배가 많은 값을 가지는 것으로 나타났다. 이번에 작성된 수간재적표(2023년)는 공시재료의 지역별 수집범위와 공시목이 많을 뿐만 아니라, 충분한 과학적 기반 하에서 만들어졌다. 따라서 전국단위의 공식적인 붉가시나무 수간재적표로 사용될 수 있을 것으로 판단된다.

• 한국토양비료학회지
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• 제40권5호
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• pp.429-434
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• 2007

This study was conducted to estimate site productivity of Quercus acutissima and Quercus mongolica by four forest climatic zones. We used site environmental variables (28 geographical and pedological factors) and site index as a site productivity indicator from nation-wide 23,315 stands. Based on multiple regression analysis between site index and major environmental variables, the best-fit multivaliate models were made by each species and forest climatic zone. Most of site index prediction models by species were regressed with seven to eight factors, including altitude, relief, soil depth, and soil moisture etc. For those models, three evaluation statistics such as mean difference, standard deviation of difference, and standard error of difference were applied to the test data set for the validation of the results. According to the evaluation statistics, it was found that the models by climatic zones and species fitted well to the test data set with relatively low bias and variation. Also having above middle of site index range, total area of productive sites for the two Quercus spp. estimated by those models would be about 6% of total forest area. Northern temperate forest zone and central temperate forest zone had more productive area than southern temperate forest zone and warm temperate forest zone. As a result, it was concluded that the regressive prediction with site environmental variables by climatic zones and species had enough estimation capability of forest site productivity.