• The Korean Journal of Ecology
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• 제20권4호
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• pp.259-264
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• 1997

To determine patterns of nitrogen (N) and phosphorus (P) change in foliage and twig we collected branch samples of 40-year-old Pinus rigida and Larix leptolepis plantations every month during the growing season of 1996 in Yangpyeong, Kyonggi-Do. Significant seasonal differences on N and P concentrations in foliage and twig were observed for both study species because of nutrient retranslocation. P. rigida and L. leptolepis retranslocated 40 and 37% of foliar N and 86 and 16% of foliar P, respectively. Twig N and P retranslocation rates of P. rigida and L. leptolepis were 114 and 25%, and 42 and 70%, respectively. There were no significant differences in foliar N retranslocation rates between P. rigida and L. leptolepis while P retranslocation rate in foliage of P. rigida was higher than that of L. leptolepis. Our results suggested that twigs were the main sinks for retranslocated nutrients from foliages of the both study species.

• The Plant Pathology Journal
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• 제16권1호
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• pp.52-54
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• 2000

Pitch canker of Pinus rigida, caused by Fusarium subglutinans f. sp. pini, was first noticed in Inchon, Korea, and is now being spread into other plantations of pines. Typical symptoms re resin flows from canders on the shoots, branches, and trunks, and resin-soaking of the sap wood under the bark. Pathogenic fungi were isolated from the infected shoots, branches, and sees on Fusarium-selective medium. Mycelial growth and microscopic characteristics were examined. Pathogenicity test was carried out by inoculating four common species of pines (P. rigida, P. densiflora, P. thunbergii, and P. koraiensis) in Korea. P. rigida and P. thunbergii showed symptoms identical to those of naturally infected trees, while P. densiflora and P. koraiensis remained free symptomless.

• 한국식물생명공학회:학술대회논문집
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• 한국식물생명공학회 2005년도 추계학술대회 및 한일 식물생명공학 심포지엄
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• pp.120-125
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• 2005

Continuous degradation of forest in both quality and quantity threatens wood security in the future. Thus in the future, most wood and pulp will be expected to be produced from plantation forests. We attempt to produce superior trees suitable for such plantations with maximum productivity in limited land area. Tree productivity could be enhanced either by promoting growth and wood quality or by reducing loss caused by abiotic and biotic stresses. Genetic transformation techniques may offer ways to improve the productivity by enabling trees to tolerate the stresses or to covert limited resources into big biomass. With the availability of information on various functional genes and gene transfer techniques, it should be possible to develop such trees. In this presentation, our work to produce such trees at Korea Forest Research Institute is briefly introduced.

• The Korean Journal of Ecology
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• 제23권6호
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• pp.435-438
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• 2000

Diameter distributions describe forest stand structure information. Prediction equations for percentiles of diameter distribution and parameter recovery procedures for the Weibull distribution function based on four percentile equations were applied to develop prediction system of even-aged slash pine stand structure development in terms of the number of stems per diameter class changes. Four percentiles of the cumulative diameter distribution were predicted as a function of stand characteristics. The predicted diameter distributions were tested against the observed diameter distributions using the Kolmogorov-Smirnov two sample test at the ${\alpha}$=0.05 level. Statistically, no significant differences were detected based on the data from 236 evaluation data sets. This stand level diameter distribution prediction system will be useful in slash pine stand structure modeling and in updating forest inventories for the long-term forest management planning.

• 한국환경복원기술학회지
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• 제10권6호
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• pp.62-69
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• 2007

This study has been carried out to estimate aboveground carbon contents in an average 30-years-old Betula platyphylla and 32-years-old Juglans mandshurica stands in Chungju, Chungbuk Province. Nine sample trees were cut in each forest and soil samples were collected. Carbon concentration in stemwood, stembark, branch, and foliage were ranged from 54.6% to 57.0% in Betula platyphylla and 53.5% to 56.9% in Juglans mandshurica stands. Aboveground carbon contents was estimated by the equation model logWt=A+BlogD where Wt is oven-dry weight in kg and D is DBH in cm. Total aboveground carbon contents was 34.31t/ha in Betula platyphylla stand and 21.10t/ha in Juglans mandshurica stand. Aboveground net primary carbon production was estimated at 2.31t/ha/yr in Betula platyphylla stand and 2.03t/ha/yr in Juglans mandshurica stand.

• The Korean Journal of Ecology
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• 제21권6호
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• pp.791-797
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• 1998

An attempt to clarify the landscape structure of urban areas was carried out on Mt. Hwangryung located in the center of Pusan, southern Korea. By means of aerial photographs and field survey, a vegetation map including land-use pattern was made. Landscape structure was described by analyzing the vegetation map. Landscape element types were classified into secondary forest, introduced plantation, and other elements including urbanized area. almus firma and Pinus thunbergii communities, introduced plantation elements, formed matrix and some secondary forest elements and the other artificial plantations of small scale tended to distribute as small patches in such matrix. The number of patches per unit area in secondary forest elements was more than that in introduced plantation element. The result on patech size was vice versa. As the results of landscape ecological analyses, it was estimated that differentiation of patches recognized in community level would be related to artificial interference and those in sub-communities levels to natural process such as progression of succession. On the other hand, restoration plans in viewpoints of restoration and landscape ecology were suggested to improve ecological quality of Mt. hwangryung.

• The Korean Journal of Ecology
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• 제10권1호
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• pp.43-51
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• 1987

The forest vegetation of Jongyeoul hill, Seoul, was classified into six secondary forests and two plantations by ZM method; Pinus densiflora, Quercus acutissima, Pinus rigida, Robinia pseudoacacia and Alnus hirsuta-Quercus mongolica community, and Castanea crenata and Pinus koraiensis plantation. In the herb layer the species richness and total coverage of deciduous broad leaf forests showed higher values than those of evergreen needle leaf forests. The peak in July at Q. acutissima forest and in the middle of June at R. pseudoacacia forest. Simpson's diversity index(Ds) in different stands are as follows: Ds>0.6 in R. pseudoacacia forest, Ds=0.3~0.6 in Q. acutissima forest and Ds<0.3 in P. densiflora and P. rigida forest. It is found that, although dominance rank and importance value were originated from different school each other, two measures can be used exchangablym showing almost linear positive correlation between them in this study.

• Animal cells and systems
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• 제10권3호
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• pp.163-167
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• 2006

Reverse-Phase High-performance Liquid Chromatography (RP-HPLC) based technique is one of the most sensitive techniques to detect the antibiotics present in honey. In the southern part of Tamilnadu, India, majority of the farmlands are occupied by plantations such as coconut, banana and rubber. A variety of antimicrobial compounds and antibiotics, which have been reported in pollen, nectar and other floral parts of the plant, gets accumulated in honey through honeybees (Apis mellifera). We have collected the nectar samples from banana (Musa paridasiaca) and rubber (Ficus elastica) flowers and the honey from honey hives of banana and rubber cultivated areas. The extracted nectar and honey samples are subjected to RP-HPLC analysis with authentic antibiotic standards. Nectar and honey samples showed 4-17, 11-29 ${\mu}g/kg$ of streptomycin, 2-29, 3-44 ${\mu}g/kg$ of ampicillin and 17-34, 26-48 ${\mu}g/kg$ of kanamycin respectively.

• Journal of Forest and Environmental Science
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• 제35권2호
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• pp.115-120
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• 2019

There are many countries having a long history of exotic tree introduction from different countries and several countries including New Zealand, Brazil and Hungary have successfully introduced exotic trees. Korea's tree breeding program for introduction of exotic tree was originally started from 1924. Records reveal that hundreds of tree species were introduced from many countries and tested their germination and viability. About 415 introductions were eliminated since they had been introduced and tested. Subsequently, seven exotic trees that proved successful in trials and plantations have planted for afforestation. Simultaneously, several promising exotic trees are still under the test. In this paper, we will succinctly review and evaluate their comparative growth performance of the exotic trees in the plantation programs of the country to coping with climate change.

• 한국산림과학회지
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• 제90권3호
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• pp.257-265
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• 2001

리가다소나무 조림지의 벌채수준에 따라 토양에 서식하는 토양미소절지동물의 분포상에 대하여 조사하기 위하여 1998년 5월부터 1999년 4월까지 조사한 결과는 다음과 같다. 1. 조사기간동안 토양미소절지동물은 총 7강 21목 181,904개체가 채집되었으며, 이들의 구성은 거미강(Arachnida), 곤충강(Insecta), 연갑강(Malacostra), 소각강(Pauropoda), 노래기강(Diplopoda), 지네강(Chilopoda), 애지네강(Symphyla)이었다. 2. 조사기간내 채집된 토양미소절지동물은 대조구에서 82,9627개체, 잔존구에서 62,688개체, 벌채구에서 36,254 개체로 대조구는 벌채구에 비하여 2배 이상 채집되었다. 3. 벌채로 인한 영향은 응애목이 비교적 심하여, 벌채시 응애목과 톡토가목의 밀도가 모두 감소하나, 특히 응애목의 감소율이 높아 벌채구에서는 톡토기목의 비율이 상대적으로 높아진다. 4. 토양미소절지동물의 군집구성비는 거미강이 59.74%(108,678개체)로 가장 높은 개체수 밀도를 보였으며, 곤충강이 39.82%(72,427개체)로 나타나 이들 2군의 합계가 99.56%(181,105개체)로 절대적인 우위를 보였다. 5. 거미강에서는 응애목이 전체의 99.18%, 곤충강에서는 톡토기목이 93.99%로 가장 높은 개체수 밀도를 나타냈으며, 전체동물군에서도 응애목(59.25%), 톡토기목(37.42%)의 분포비율이 96.67%로 가장 높았고 벌목 0.95%, 파리목 0.64%, 앉은뱅이목 0.39%의 순이었다. 6. 계절에 따른 토양미소절지동물 군집분포는 7월에 최저를 기록하고 점차 증가하여 가을철인 11월에 가장 높은 밀도를 나타냈으며, 겨울철로 갈수록 점차 감소하는 경향을 보이다가 봄철인 4월에 다시 증가하는 경향을 나타내고 있다.