• Journal of agriculture & life science
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• v.46 no.1
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• pp.71-81
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• 2012

This study was conducted to get basic information about making windbreak forest around Saemanguem reclaimed lands by analyzing the vegetation structure of 8 windbreak forests along the west coast of Korea and considering the methods of structural improvement. The total plants existing in the study areas were 25 families 40genus 43 species, and every tree layer consisted of only one tree species, Pinus thunbergii. There were 2 windbreak stands consisted of a species, and 2 consisted of multiple layer with a species. While, 4 windbreak stands consist of various species with several species. To make ecological system and functions of windbreak forests stabler, TL, STL and SL should be together in the vertical point, moreover, TL should be appeared at the in side and SL should be planted at the out side in the horizontal point. It is considered that mixed stand forest might be suitable for increasing the windbreak forest's functions and decreasing damage caused by disease and insects.

• Journal of Apiculture
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• v.34 no.3
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• pp.189-195
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• 2019

Plants release a large variety of volatile organic compounds (VOCs) into the surrounding atmosphere. Floral volatile compounds (FVCs) emitted from many plants is the critical factors for pollinator attraction and defense for adaptation in environments. Recent studies indicate that the chemical components contributing to FVCs play an important role in the honeybee attractiveness to flowers. Olfactory signals are rapidly learned, indicating that foraging behavior results from the association of plant chemicals acting as chemosensory cues for the bees. Solid phase microextraction(SPME)-GC/MS method was applied to analyze the chemical composition of FVCs according to the different species of Robinia spp. The abundant compounds identified in R. pseudoacacia were (Z)-β-ocimene (34.86%) and linalool (35.47%). Those of the tetraploid R. pseudoacacia were (Z)-β-ocimene (35.42%) and α-Farnesene (33.94%). The volatiles of R. margarettae 'Pink Cascade' comprised an abundance of (Z)-β-ocimene (42.73%), (E)-4,8-Dimethylnona-1,3,7-triene (37.23%). Differences in FVCs of the different species of Robinia spp. are discussed in light of biochemical constraints on volatile chemical synthesis and of the role of flower scent in ecology of pollination.

• Korean Journal of Agricultural and Forest Meteorology
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• v.21 no.3
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• pp.208-220
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• 2019

The seasonality of leaf fall has important implications for understanding the response of trees' phenology to climate change. In this study, we quantified the leaf fall pattern with a model to estimate the timing and speed of leaf litter according to species and considered the nutrient use strategy of canopy species. In the autumns of 2015 and 2016, leaf litter was collected periodically using 36 litter-traps from the deciduous forests in Gwangneung and sorted by species. The seasonal leaf fall pattern was estimated using the non-linear regression model of Dixon. Additionally, the resorption rate was calculated by analyzing the nitrogen concentration of the leaf litter at each collection time. The leaf litter generally began in early October and ended in mid-November depending on the species. At the peak time (T50) of leaf fall, on average, Carpinus laxiflora was first, and Quercus serrata was last. The rate of leaf fall was fastest (18.6 days) for Sorbus alnifolia in 2016 and slowest (40.8 days) for C. cordata in 2015. The nitrogen resorption rates at T50 were 0.45% for Q. serrata and 0.48% for C. laxiflora, and the resorption rate in 2015 with less precipitation was higher than in 2016. Since falling of leaf litter is affected by environmental factors such as temperature, precipitation, photoperiod, and $CO_2$ during the period attached foliage, the leaf fall pattern and nitrogen resorption differed year by year depending on the species. If we quantify the fall phenomena of deciduous trees and analyze them according to various conditions, we can predict whether the changes in leaf fall timing and speed due to climate change will prolong or shorten the growth period of trees. In addition, it may be possible to consider how this affects their nutrient use strategy.

• Journal of Korean Society of Forest Science
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• v.99 no.6
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• pp.827-835
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• 2010

Reliable forest statistics provides important information to meet the UNFCCC. In this respect, the national forest inventory has played a crucial role to provide the reliable forest statistics for several decades. However, the previous forest statistics calculated by administrative district has not provided spatial information in a small scale. Thus, this study focused on developing models to estimate an explicit spatial distribution of forest growing stock. For this, first, stand volume model by stand types was developed using National Forest Inventory(NFI) data. Second, forest type map was integrated with this model. NFI data were used to calculate plot-level stand volume and basal area. The stand types of NFI plot including the species composition, age class, DBH class and crown density class are very crucial data to be connected with forest type map. Finally, polygonlevel stand volume map was developed with spatial uncertainty map. Average stand volume was estimated at 85.7 $m^3$/ha in the study area, and at 95% significance interval it was ranged from 79.7 $m^3$/ha to 91.8 $m^3$/ha.

• Journal of Korean Society of Forest Science
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• v.111 no.3
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• pp.385-393
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• 2022

The study was carried out in Pocheon-si, Gyeonggi-do from March to December in 2019 to compare and analyze the water use strategies of two co-occurring tree species, Pinus densiflora and Quercus serrata, both native and dominant in Korea's forest ecosystems. Through seasonal changes, we measured environmental variables such as air temperature, relative humidity, precipitation, net radiation, and soil water content. Sap flow densities of P. densiflora (n = 6) and Q. serrata (n = 3) were measured, along with environmental variables. The maximum sa pflow density for Q. serrata almost doubled that of P. densiflora during the growing season, while the maximum sap flow densities in both Q. serrata and P. densiflora peaked in September and August, respectively. Net radiation and vapor pressure deficit, but not air temperature, were the major environmental variables significantly affecting sap flow density. Analysis of hysteresis revealed that P. densiflora exhibited isohydric behavior, while Q. serrata showed anisohydric behavior. Analysis of crown conductance revealed similar trends as sap flow density, i.e., the crown conductance of Q. serrata was twice that of P. densiflora during the growing period. The study compared and analyzed the water use strategies between two co-occurring species. To better understand the underlying mechanisms of water use, more research on both physiological and morphological traits are needed.

• Korean Journal of Environment and Ecology
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• v.9 no.2
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• pp.126-132
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• 1996

The Gugogdong-Horyongbong valley forest in Odaesan National Park area was studied to investigate forest structure in relation to altitude and part of slope. Forty-eight quadrats were set up in the valley forest along altitude of 800m to 1,500m and part of the slote. With increasing elevation the important values of Quercus mongolica and Rhododendron schlippenvachii increased, while those of Abies holophulla, Ulmus davidiana var. japonica and Lindera obtusiloba decreased. As going from lower part to upper part of the slope, the importance values of Quercus mongolica and Rhododendron schlippenbachii increased while those of Acer mono and Ulmus laciniata decreased. Species diversity tended to decreased as increasing elevation. The range of similarity indices between elevation belts, and parts of the slope were 56.3~73.4% and 61.9~71.8%, respectively. According to importance value and cluster analysis, the studied valley forest was classified into tree forest communities of Abies holophulla-deciduous tree species community in lower and middle parts of slope at low and middle elevation belts, Quercus mongolica- coniferous tree species community in upper part of slope at low and middle elevation belts and lower and middle parts of slope at high elevation belt and Quercus mongolica community in upper part of slope at high elevation belt and top area.

• Journal of Korean Society of Forest Science
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• v.80 no.2
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• pp.220-231
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• 1991

The main purpose of this research is to standardize the logging operation with special reference to the net working time for thinning. This study was carried out to obtain the standard working method and working technique for Korean logging operation through the comparison of the present Korean working method and the German standard working method 1. The net working time devided into work elements showed little difference between those two working methods. 2. From the correlation analysis, net working time was significantly correlated with breast height diameter, the dependant variable, with the highest correlation coefficient in each species. 3. Total working time increases by 11 to 13 seconds to every 1 centimeter increase in breast height diameter from i to 16 centimeter. 4. The result of this study concluded that the German working method is recommended for improving the labour problems in the forest operation due to high wages and lack of manpower gradually increasing from now in Korea. In addition to the application of this standard working method, the technical training for the method should be done to the workers for improving the productivity.

• Journal of Korean Society of Forest Science
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• v.2 no.1
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• pp.1-4
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• 1962

1. 묘목(苗木)의 포장(包裝) 경과(經過) 일수(日數)와 활착(活着) 관계(關係)를 조사(調査)한즉 표준구(標準區) 즉, 굴취(堀取) 직후(直後) 직재구(直裁區)의 활착률(活着率) 95%에 비(比)하여 2일(日) 경과(經過)까지 90%, 4일(日) 경과(經過)까지 80%, 5일(日) 경과(經過)까지 77%의 활착률(活着率)을 보았다. 2. 수종(樹種)과의 관계(關係)를 보면 아카시아 > 산오리> 리기다 소나무 > 잣나무 낙엽송 순위(順位)로 포장(包裝) 경과(經過)에 견디는 힘이 컸다. 3. 연도별(年度別)(1958, 1959)의 성적차는 인정치 않았다.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2002.11a
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• pp.93-96
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• 2002

산림생산력을 추정할 수 있는 방법은 매우 다양하다. 그러나 토지의 생산력을 추정하는 보편적이며 세계적인 추정법은 지위지수이다. 특히 지위지수는 지력뿐만 아니라 임목 생장을 함께 추정 할 수 있으므로 연구자는 물론 산림 종사자에게도 매우 편리한 추정법으로서 이용되고 있다. 우리나라는 지위를 추정하는 방법으로 수령과 수고의 비로 나타내는 지위지수 분류곡선식을 조제하여 사용하고 있으며, 지위추정 방법과 추정의 정확도가 높아 범용되고 있다.(중략)

• Journal of Korean Society of Forest Science
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• v.67 no.1
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• pp.31-41
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• 1984

This study was examined for purposes of identifing woods of the hull construction collected from a sunken old-ship by the anatomical wood features, and then from the result the geographical distribution ranges of the species were described. Most woods of the hull construction, i.e. shell plating, bulkhead, floor, bulwark, deck and kneel were identified with Chinese red pine (Pinus massoniana), but the fenders were idendified with Chinese fir (Cunninghamia lanceolata). These two species are known to be the endemic species in the south region of Yangtze River. As the other materials, bulwark stays and liquid tank stays were respectively identified with Cinnamomum spp., Distylium spp., and the geographical distributions of these species are the south China, the south coast of Korea and the Japanese Islands.