• 한국환경과학회지
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• 제22권10호
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• pp.1345-1351
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• 2013

Leaf characteristics of two representative deciduous-tree species in Korean peninsula were compared to assess directional ridge effect on leaf traits of both species. Leaf mass per unit area (LMA) of Rhododendron schilippenbachii in south-facing ridge slope was significantly higher than that in north-facing ridge slope, while Quercus mongolica did not change LMA. Leaf mass of Q. mongolica was increased depending on leaf size irrespective of slope. However, leaf mass of R. schilippenbachii changed differently in responding to expansion of leaf area between both slopes resulting from retardation of leaf expansion in south-facing slope. R. schilippenbachii showed higher leaf nitrogen concentration per unit area (LNCA) in south-facing slope than that in north-facing slope, while Q. mongolica indicated no difference in LNCA between southand north-facing slopes. However, both species revealed no significant difference in leaf nitrogen concentration per unit mass (LNCM) between south- and north-facing slopes. LNCA of Q. mongolica was about two times higher than that of R. schilippenbachii. These results indicate that there is a difference in leaf characteristics including leaf thickness and nitrogen allocation between Q. mongolica and R. schilippenbachii, suggesting the difference of plasticity.

• International Journal of Industrial Entomology and Biomaterials
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• 제7권1호
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• pp.69-73
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• 2003

Specific leaf weight (SLW), defined as the mass of tissue per unit leaf area has been found to be an important physiological parameter as it indicates the relative thickness of leaves. Greater SLW provides more photosynthetic potential per unit area of leaf and hence it is frequently been considered as correlated with photosynthesis in several plant species. Collections of 165 mulberry (Morus sp.) germplasm accessions, both Indian and exotic in origin were evaluated for their variability with respect to SLW. The mean specific leaf weight ranged from 35.3 to $72.3 g/m^{-2}$. The distribution of SLW was found to be normal. High heritability (97.08%) and a small difference between genotypic and phenotypic variance demonstrates the genetic control over SLW. Significant heterotic effect with respect to SLW was observed in crosses when parents with high and low SLW were chosen.

• 한국환경과학회지
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• 제22권2호
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• pp.187-193
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• 2013

Dry matter allocation characteristics of Calystegia soldanella, grown in pots, was analysed to assess its plasticity in response to water-stressed conditions. As water was withheld leaf water potential between the two watering treatments was similar during the first 6 days, followed by a rapid decrease in water-stressed plants. The minimum leaf water potential was -1.50 MPa on day 15 and the maximum leaf water potential was about -0.5 MPa on day 0 in water-stressed plants. In well-watered plants leaf water potential was maintained almost consistently throughout the experiment. There was no significant difference in plant dry weight between the two watering treatments for 9 days after the start of experiment and that was remarkably increased thereafter, compared with that remained without any increase in water-stressed plants. In dry mass partitioning, however, the water-stressed plants showed a great plasticity, showing that there were 1.81, 1.35 and 0.81 times increase in root, stem and leaf, respectively. Dry mass partitioning in well-watered plants varied from 2% to 5%. The difference of dry mass partitioning between the two watering treatments was reflected in leaf mass per unit area (LMA) and root/shoot (R/S) ratio. LMA in water-stressed plants was lower than that in well-watered plants, while R/S ratio in water-stressed plants was higher in well-watered plants. This means that the water-stressed plants reduced its leaf area and increased dry mass partitioning into root and stem during the progress of soil drying. These results indicate that Calystegia soldanella inhabiting in sand dune cope with water stress with high plasticity which can adjust its dry mass partitioning according to soil water conditions.

• 한국환경과학회지
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• 제26권10호
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• pp.1147-1153
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• 2017

To maintain a rich biological diversity is important to develop for biomaterial resources such as Korean evergreen broad-leaved tree species, the distribution of which is restricted to the southern part of Korean peninsula. We assessed photosynthetic characteristics of Quercus acuta and Castanopsis sieboldii, the representative evergreen broad-leaved trees in Korea, in order to establish a basis for conservation strategy related to distributional change in evergreen broad-leaved tree species according to climate change. Photosynthetic characteristics were evaluated in the sun and shade leaves of the two species. Sun leaves in both species revealed higher light compensation point and maximum photosynthetic rate compared to the shade leaves. In addition, photosynthetic rate was higher in Q. acuta than C. sieboldii, which was supported by a higher leaf nitrogen content and leaf mass per area. Water use efficiency was also higher in Q. acuta as compared to that in C. sieboldii. Similar photosynthetic rate, however, was shown in photosynthetic response to $CO_2$ concentration in the intercellular space. These results suggest that both species could respond differently to the changing environmental factors including climate change, suggesting the possibility of distributional changes resulting from a differential growth rate.

• Journal of Forest and Environmental Science
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• 제29권1호
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• pp.38-48
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• 2013

Decomposition of plant material is an important component in the study of forest ecosystem because of its critical role in nutrient cycling. Different tree species has different nutrient release patterns, which are related to leaf litter quantitative traits and seasonal environmental factors. The quantitative traits of leaf litter are important predictors of decomposition and decomposition rates increase with greater nutrient availability in the forest ecosystems. At the ecosystem level, litter quantitative traits are most often related to the physical and chemical characteristics of the litter, for example, leaf toughness and leaf mass per unit area, and lignin content tannin and total phenolics. Thus, the analysis of litter quantitative traits and decomposition are highly important for the understanding of nutrient cycling in forest ecosystems. By studying the role of litter quantitative traits on decomposition and nutrient cycling in forest ecosystems will provide a valuable insight to how quantitative traits influence ecosystem nutrient dynamics. Such knowledge will contribute to future forest management and conservation practices.

• 원예과학기술지
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• 제31권5호
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• pp.565-572
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• 2013

본 연구의 목적은 고압나트륨등 광원(HPS)을 조사하여 파프리카의 동적생장과 기관별 건물분배율 및 광이용효율에 미치는 효과를 구명하고자 수행하였다. 파프리카 육묘는 2010년 9월 29일에 $m^2$당 3.75주를 정식하여 2010년 12월 14일부터 HPS 광원을 실험종료일까지 하루 16시간 조사하였다. HPS 처리는 엽수를 증가시켰으나, 절간수와 엽면적에는 미비한 영향을 미쳤다. HPS 처리구의 초장은 대조구에 비해 짧았으나, 줄기당 착과수의 증가를 나타냈다. 줄기와 과실 및 총건물중은 HPS 처리구가 대조구보다 각각 28.5%, 97.1%, 67.8%를 증가시켰다. 총 건물중의 증가율 대비 엽과 줄기 생장율을 비율로 나타낸 각 기관의 건물분배율은 생육초기에 45-47%로 동일하다가 과실의 생장이 시작되는 시점에서 급격히 감소하였다. 영양생장기관으로의 건물분배율은 대조구에서 HPS 처리구보다 4% 높았다. 과실로의 평균 건물 분배율을 HPS 처리구에서 대조구에 비해 14.2% 증가하였다. 동적생장량은 지수선형함수의 최대상대생장율, 최대 절대생장율 및 손실일수로 잘 묘사할 수 있었다. 대조구에 비해 처리구의 엽의 최대절대생장율은 18.6%, 줄기는 74.7%, 과실은 143.5%가 증가하는 것으로 추정되었다. 총 건물중에 대한 광이용효율(LUE)은 HPS 처리구에서 $4.90g{\cdot}MJ^{-1}$로 대조구의 $3.84g{\cdot}MJ^{-1}$ 높았으며, 영양생장기관의 LUE는 HPS 처리구가 $1.56g{\cdot}MJ^{-1}$로 대조구의 $1.61g{\cdot}MJ^{-1}$보다 약간 낮았으며, 과실 생산에 대한 LUE는 처리구가 $3.34g{\cdot}MJ^{-1}$로 대조구 $2.23g{\cdot}MJ^{-1}$보다 49.8% 증가하였다. 처리간 총 건물중의 LUE의 차이는 HPS 처리구의 과실생산에 대한 LUE가 높았기 때문에 발생되었다.

• 한국산림과학회지
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• 제113권2호
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• pp.198-209
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• 2024

본 연구에서는 차광 수준에 따른 광환경의 차이가 갯활량나물의 생리 반응에 미치는 영향을 조사하기 위해 차광 처리에 따른 갯활량나물의 엽면적당 건중량, 엽록소 함량, 엽록소 형광 반응 및 광합성 특성을 측정하였다. 갯활량나물의 경우 차광 수준이 높아짐에 따라 엽면적이 증가하고 엽면적당 건중량이 감소하여 낮은 광도 조건에서 광형태형성학적인 적응을 보였다. 생리생태학적 적응 반응은 50% 차광 수준에서 엽록소 함량, 광포화점, 광합성률, 탄소고정효율, 기공전도도, 증산속도, 수분이용효율 등 전반적으로 광합성 기능이 양호했던 반면, 95% 차광 수준에서는 생육에 필요한 최소 광도 조건이 충족되지 못하여 광합성 기능이 크게 저하되는 것으로 나타났다. 이를 통해 갯활량나물의 생육에 있어서는 50% 차광 수준이 가장 적절한 것을 알 수 있었다. 본 연구 결과는 갯활량나물의 효과적인 현지외 보전을 위한 적지 선정 및 기반 조성을 위한 자료로 활용될 수 있을 것으로 기대되며, 이후 차광 처리에 따른 식물 생장에 대한 연구가 보완되어야 할 것으로 생각된다.

• 한국자원식물학회지
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• 제37권2호
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• pp.203-213
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• 2024

본 연구에서는 북방계 식물 제비붓꽃의 현지외 보전에 필요한 생육 적정 광조건을 제시하기 위하여 차광처리에 따른 제비붓꽃의 생장과 생리적 반응을 조사하였다. 전천광을 수광하는 대조구와 서로 다른 차광처리구(50%, 75%, 95%)를 설치하고 엽면적당 건중량, 엽록소 함량과 형광 반응, 광합성 특성을 조사하였다. 제비붓꽃은 차광수준이 강해질수록 낮은 광도에 적응하기 위하여 광합성 효율이 높아진 잎이 형성되었다. 차광수준이 높아질수록 엽록소 함량이 증가하였고, 엽면적이 증가하면서 엽면적당 건중량은 감소하였다. 차광처리에 의해 엽록소 형광 반응 Fv/Fm과 NPQ는 변화하지 않았고, 탄소고정계의 활성 또한 처리 간에 차이가 없었다. 제비붓꽃은 양지식물에 해당하는 광포화점을 나타냈고, 75% 차광수준까지 광합성 능력을 대조구와 비슷한 수준으로 유지하였다. 제비붓꽃의 순양자수율은 95% 차광처리에서 현저히 감소하여 낮은 광조건에 적응한 상태를 보였다. 제비붓꽃은 전천광 대비 95% 차광수준에서 생육할 시 광합성 능력이 저하하는 것으로 보이며, 차광 상태를 지속하여 광을 제한할수록 생육이 불리할 것으로 판단된다.

• 한국제4기학회지
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• 제17권2호
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• pp.163-163
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• 2003

The study area, Kwangneung Experiment Forest (KEF) is located on the west-central portion of Korean peninsula and belongs to a cool-temperate broadleaved forest zone. At the old-growth deciduous forest near Soribong-peak (533.1m) in KEF, we have established a permanent plot and a flux tower, and the site was registered as a KLTER site and also a KoFlux site. In this study, we aimed to present basic ecological characteristics and synthetic data of carbon budgets and flows, and some monitoring data which are essential for providing important parameters and validation data for the forest dynamics models or biogeochemical dynamics models to predict or interpolate spatially the changes in forest ecosystem structure and function. We made a stemmap of trees in 1 ha plot and analyzed forest stand structure and physical and chemical soil characteristics, and estimated carbon budgets by forest components (tree biomass, soils, litter and so on). Dominant tree species were Quercus serrata and Carpinus laxiflora, and accompanied by Q. aliena, Carpinus cordata, and so on. As a result of a field survey of the plot, density of the trees larger than 2cm in DBH was 1,473 trees per ha, total biomass 261.2 tons/ha, and basal area 28.0 m2/ha. Parent rock type is granite gneiss. Soil type is brown forest soil (alfisols in USDA system), and the depth is from 38 to 66cm. Soil texture is loam or sandy loam, and its pH was from 4.2 to 5.0 in the surface layer, and from 4.8 to 5.2 in the subsurface layer. Seasonal changes in LAI were measured by hemispherical photography at the l.2m height, and the maximum was 3.65. And the spatial distributions of volumetric soil moisture contents and LAIs of the plot were measured. Litterfall was collected in circular littertraps (collecting area： 0.25m2) and mass loss rates and nutrient release patterns in decomposing litter were estimated using the litterbag technique employing 30cm30cm nylon bags with l.5mm mesh size. Total annual litterfall was 5,627 kg/ha/year and leaf litter accounted for 61% of the litterfall. The leaf litter quantity was highest in Quercus serrata, followed by Carpinus laxiflora and C. cordata, etc. Mass loss from decomposing leaf litter was more rapid in C. laxiflora and C. cordata than in Q. serrata litter. About 77% of C. laxiflora and 84% of C. cordata litter disappeared, while about 48% in Q. serrata litter lost over two years. The carbon pool in living tree biomass including below ground biomass was 136 tons C/ha, and 5.6 tons C/ha is stored in the litter layer, and about 92.0 tons C/ha in the soil to the 30cm in depth. Totally more than about 233.6 tons C/ha was stored in DK site. And then we have drawn a schematic diagram of carbon budgets and flows in each compartment of the KEF site.

• 한국환경복원기술학회지
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• 제25권4호
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• pp.1-13
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• 2022

본 연구에서는 차광처리가 벌개미취와 구절초의 생리적 반응에 미치는 영향을 조사하기 위해, 대조구(0%)와 3개의 서로 다른 차광처리구(50%, 75%, 95%)를 설치하고 엽록소 함량, 생장 및 광합성 특성을 조사하였다. 벌개미취와 구절초 모두 차광수준이 높아질수록 낮은 광도에 적응하기 위해 광합성에 대한 빛의 흡수 효율이 높은 잎이 형성되었다. 또한 차광수준이 높아질수록 낮은 광도에서 광합성을 수행하기 위해 암호흡속도의 저하와 광보상점의 감소가 나타났고, 광합성 효율을 높이기 위해 엽록소 함량과 순양자수율이 증가하였다. 광합성 속도는 대조구에서 가장 높았고 차광수준이 높아질수록 저하하였다. 대조구에서는 강광에 의한 수분손실을 막기 위해 기공전도도와 증산속도가 감소하였다. 50% 차광처리구의 기공전도도와 증산속도는 대조구에 비해 높았으나, 75%와 95% 차광처리구에서는 더 낮게 나타나 광합성 효율이 떨어지는 것으로 나타났다. 수분이용효율 또한 광합성속도와 유사한 경향으로 나타났고, 차광수준에 따라서 저하하는 것으로 나타났다. 벌개미취는 전천광보다 낮은 광 조건에서 생육할 시 광합성 능력이 저하하는 것으로 보이며, 구절초의 경우 50% 차광처리까지는 광합성에 큰 영향을 끼치지 않는 것으로 판단된다. 벌개미취와 구절초는 광을 제한하여 차광 상태를 지속하게 되면 생육에 불리할 것으로 판단된다. 이러한 벌개미취와 구절초의 생육특성은 상층임관이 존재하지 않은 DMZ 불모지와 같은 환경에 도입시키기 적합할 것으로 판단된다.