• 한국농림기상학회지
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• 제5권2호
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• pp.87-93
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• 2003

산림생태계에서 낙엽낙지의 유입과 유입된 낙엽낙지의 분해는 산림의 주요한 탄소 및 양분의 공급원이다. 본 연구는 온대중부지역에 속하는 경기도 광릉의 천연 활엽수림에 위치한 DK-site를 대상으로 2년 동안 연 낙엽낙지 유입량과 낙엽분해율을 측정하였다. 낙엽낙지량은 원형의 낙엽수집기(수집면적 0.25$m^2$)를 낙엽분해 율은 10${\times}$30 cm 크기의 낙엽분해주머니(메쉬 1.5 mm)를 이용하였다. 광릉 장기생태연구조사구의 연 낙엽낙지량은 5,627 kg/ha/yr로 이중 순수한 엽량은 총 낙엽낙지량의 61%를 차지하였다. 수종별 유입량은 본 조사구의 우점종인 졸참나무 잎이 가장 많은 양을 보였으며 서어나무, 까치박달 순이었다. 낙엽분해율은 서어나무, 까치박달 낙엽이 졸참나무 낙엽에 비해 분해속도가 빨라 2년의 조사기간 동안 까치박달 낙엽 84%, 서어나무 낙엽 77%, 졸참나무 낙엽 48%가 분해되었다. 졸참나무 낙엽의 분해가 느리게 진행된 것은 타수종의 낙엽에 비해 졸참나무 낙엽내 낮은 양분함량 같은 기질의 차가 원인인 것으로 나타났다. 칼륨을 제외한 양분(N, P, Mg)함량은 분해 초기함량에 비해 낙엽분해과정동안 증가하였다. 또한 낙엽분해과정동안 양분(N, P, K, Ca, Mg)의 방출량은 까치박달과 서어나무낙엽이 졸참나무낙엽에 비해 신속한 것으로 나타났다. 본 연구결과에 따르면 광릉장기생태연구 조사구내 우점종의 낙엽분해와 양분의 동태는 동일한 입지에 있어서도 수종간에 상당한 차이를 나타내었다.

• 한국산림과학회지
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• 제94권5호통권162호
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• pp.302-306
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• 2005

Litterfall and nutrient inputs were measured in even-aged coniferous plantations (a 31-year-old Pinus rigida and a 31-year-old Larix leptolepis) on a similar site condition in the Forest Practice Research Center, Gyeonggi Province. Litterfall was collected monthly from circular littertraps (collecting area: $0.50m^2$) for three years between April 1997 and February 2000. Average total annual litterfall was significantly higher for pine (5,802 kg/ha/yr) than for larch (4,562 kg/ha/yr) plantations. Needle litter in both plantations accounted for about 63% of total litterfall. Litterfall in the larch was distributed as follows: needle > other leaf > branch > miscellaneous > bark, while it was needle > miscellaneous > other leaf > branch > bark in the pine plantation. There was no temporal variation in needle litter, other leaf and bark during the 3 year study period. The concentrations of all nutrients (N, P, K, Ca, Mg) in needle litter were significantly higher in the larch than in the pine plantations. The annual nutrient concentration of needle litter in the larch varied among the years, whereas no year variation of needle litter was in the pine except for phosphorus (P). Nitrogen (N) and P inputs by needle litter were significantly higher for larch than for pine plantations established on a similar soil. The differences in N and P inputs were attributed to lower nutrient concentration in pine needle litter compared with larch needle litter, not to total needle litter mass. Annual inputs of nutrient in both plantations were not significantly different among years except for K of the larch although there was yearly different in needlefall mass and nutrient concentration during the 3-year observed period. The results indicate that the mechanisms of litterfall and nutrient inputs vary considerably between pine and larch plantations established on a similar site condition.

• Journal of Ginseng Research
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• 제44권4호
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• pp.627-636
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• 2020

Background: Cultivation of medicinal crops, which synthesize hundreds of substances for curative functions, was focused on the synthesis of secondary metabolites rather than biomass accumulation. Nutrition is an important restrict factor for plant growth and secondary metabolites, but little attention has been given to the plasticity of nutrient uptake and secondary metabolites synthesis response to soil nitrogen (N) change. Methods: Two year-field experiments of Sanqi (Panax notoginseng), which can synthesize a high level of saponin in cells, were conducted to study the effects of N application on the temporal dynamics of biomass, nutrient absorption, root architecture and the relationships between these parameters and saponin synthesis. Results: Increasing N fertilizer rates could improve the dry matter yields and nutrient absorption ability through increasing the maximum daily growth (or nutrient uptake) rate. Under suitable N level (225 kg/ha N), Sanqi restricted the root length and surface and enhanced the root diameter and N uptake rate per root length (NURI) to promote nutrient absorption, but the opposite status of Sanqi root architecture and NURI was found when soil N was deficient. Furthermore, increasing N rates could promote the accumulation of saponin in roots through improving the NURI, which showed a significant positive relationship with the content of saponin in the taproots. Conclusion: Appropriate N fertilizer rates could optimize both root architecture and nutrient uptake efficiency, then promote both the accumulation of dry matter and the synthesis of saponins.

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2005년도 International Meeting of the Microbiological Society of Korea
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• pp.189.1-189
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• 2005

• 한국동물학회:학술대회논문집
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• 한국동물학회 1996년도 한국생물과학협회 국제학술대회
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• pp.110.1-110
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• 1996

No Abstract, See Full Text

• 한국동물학회:학술대회논문집
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• 한국동물학회 1997년도 한국생물과학협회 학술발표대회
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• pp.160.2-160
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• 1997

No Abstract, See Full Text

• Journal of Ecology and Environment
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• 제40권1호
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• pp.5-11
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• 2016

Background: As the decomposition of lignocellulosic compounds is a rate-limiting stage in the nutrient mineralization from organic matters, elucidation of the changes in soil enzyme activity can provide insight into the nutrient dynamics and ecosystem functioning. The current study aimed to assess the effect of thinning intensities on soil conditions. Un-thinned control, 20 % thinning, and 30 % thinning treatments were applied to a Larix kaempferi forest, and total carbon and nitrogen, total carbon to total nitrogen ratio, extractable nutrients (inorganic nitrogen, phosphorus, calcium, magnesium, potassium), and enzyme activities (acid phosphatase, ${\beta}$-glucosidase, ${\beta}$-xylosidase, ${\beta}$-glucosaminidase) were investigated. Results: Total carbon and nitrogen concentrations were significantly increased in the 30 % thinning treatment, whereas both the 20 and 30 % thinning treatments did not change total carbon to total nitrogen ratio. Inorganic nitrogen and extractable calcium and magnesium concentrations were significantly increased in the 20 % thinning treatment; however, no significant changes were found for extractable phosphorus and potassium concentrations either in the 20 or the 30 % thinning treatment. However, the applied thinning intensities had no significant influences on acid phosphatase, ${\beta}$-glucosidase, ${\beta}$-xylosidase, and ${\beta}$-glucosaminidase activities. Conclusions: These results indicated that thinning can elevate soil organic matter quantity and nutrient availability, and different thinning intensities may affect extractable soil nutrients inconsistently. The results also demonstrated that such inconsistent patterns in extractable nutrient concentrations after thinning might not be fully explained by the shifts in the enzyme-mediated nutrient mineralization.

• Journal of Ecology and Environment
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• 제31권4호
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• pp.291-295
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• 2008

Weight loss and nutrient dynamics of oak and pine leaf litter during decomposition were investigated from December 2005 through June 2008 at Mt. Worak National Park as a part of National Long-Term Ecological Research Program in Korea. The decay constant (k) of oak and pine leaf litter were 0.314 and 0.217, respectively. After 30 months decomposition, remaining weight of oak and pine leaf litter was 45.5% and 58.1%, respectively. Initial C/N ratio of oak and pine leaf litter was 53.4 and 153.0, respectively. Carbon % of initial oak and pine leaf litter was similar with each other; however, nitrogen content of initial oak leaf litter (0.85%) was greater than that of initial pine leaf litter (0.33%). N and P concentration in both decomposing leaf litter increased significantly during decomposition. There was no net N and P mineralization period in decomposing pine leaf litter. K, Ca and Mg concentration in both decomposing leaf litter showed different pattern with those of N and P. After 30 months decomposition, remaining nutrients in oak and pine leaf litter were 97.7 and 216.2% for N, 123.2 and 216.5% for P, 39.3 and 44.8% for K, 47.9 and 40.6% for Ca, 30.7 and 51.2% for Mg, respectively.

• 한국농림기상학회지
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• 제7권2호
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• pp.164-170
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• 2005

본 연구에서는 경기도 광주지역 낙엽활엽수림(굴참나무, 신갈나무)에서의 강우의 이동에 따른 수량, 용존이온 농도 및 물질량 등을 조사하였다. 임외우량에 대한 수관 통과우량, 수간류량의 비을은 각각 $85\%,\;2\~6\%$로 이는 세계 각국 산림의 평균치와 비교하여 수관통과우량은 높으며, 수간류는 낮았다. 임외우량에 대한 Ao층 통과우는 $53\~54\%$를 A층, B층 토양수는 $23\~30\%,\;22\~14\%$를 나타냈다. 임외우에 비해서 단계별 강우의 이동에 따라 pH 및 이온농도가 증가하였는데,수관통과우에서 pH 및 $K^+$, 수간류에서$K^+$, Ao층 토양수에서 $Ca^{2+},\;Mg^{2+}$농도가 현저하게 증가하였으며 pH도 증가하였다. A층과 B층 토양수에서는 $Ca^{2+}$농도가 감소한 것을 제외하고는 뚜렷한 경향이 나타나지 않았다. 이와 갈이, $K^+$의 증가는 주로 수관으로부터의 용탈에 의해서, $Ca^{2+},\;Mg^{2+}$ 등의 농도증가는 Ao층에 있어서 낙엽과 낙지의 분해 및 용탈에 기인하는 것으로 판단된다. $K^+,\;Mg^{2+},\;Cl^-$는 수량 증가에 따라 이온농도가 감소하는 경향을 보였는데 이는 100 mm 미만에서 뚜렷하였다. 연간 양분량은 모든 원소에 있어서 임외우로부터 수관통과우, Ao층 토양수로 이동하는 과정에서 증가하였으나 A충, B층 토양수로 이동하는 과정에서는 감소하는 경향을 보였다. 수간류의 연간 유입 양분량은 임상으로 도달하는 전체 양분량(수관통과우+수간류)의 $10\%$ 미만으로 그 영향은 매우 적었다.

• The Korean Journal of Ecology
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• 제26권1호
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• pp.13-18
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• 2003

본 연구에서는 강원도 춘천지역 낙엽활엽수림(굴참나무, 신갈나무)에서의 강우의 이동에 따른 수량, 용존원소 농도 및 물질량 등을 조사하였다. 임외우량에 대한 각 강우량의 비율은 굴참나무임분이 신갈나무임분에 비하여 수관통과우에서 2∼3%, 그 외의 강우에서 10∼15%의 증가량을 나타내고 있었다. 임외우에 비하여 수관통과우에서는 K/sup +/농도가, Ao층통과우에서는 Ca/sup 2+/, Mg/sup 2+/, NO₃/sup -/농도가 현저하게 증가하였는데, 이는 전자의 원소농도에서는 수관으로부터의 용탈, 후자의 원소농도에서는 Ao층으로부터의 용탈 및 질산화 작용에 기인한 것이라 판단된다. 수관통과우, Ao층통과우 및 A, B층토양수에 있어서 원소농도는 수량이 증가함에 따라 감소하는 경향을 보였는데, 특히 K/sup +/, Mg/sup 2+/, Cl/sup -/농도에서 현저하였다. Ao층통과우의 Ca/sup 2+/에서 굴참나무임분이 신갈나무임분에 비하여 1.5배 정도 높은 값을 나타낸 것 이외에는 다른 강우의 물질량에 있어서는 임분 간 뚜렷한 차이는 없었다. 연간 수간류 물질량은 임상으로 도달하는 강우(수관통과우+수간류)물질량의 10% 미만이었는데, 양적인 면으로 보아 물질순환 과정에 있어서 수간류의 비중은 작다고 판단된다.