• 환경생물
• /
• 제34권4호
• /
• pp.272-280
• /
• 2016

Changes in land use and increase in urban energy consumption influence urban life. This study analyzed the characteristics and patterns of urban heat and presents management schemes to generate a comfortable and sustainable urban environment. The study aimed to demonstrate the positive effects of artificial ground greening on improving the microclimate through evapotranspiration using perennial herbs. We have designed a chamber that could control constant temperature and humidity, measure temperature reductions in each plant and changes in sensible heat and latent heat. This study identified Sedum kamtschaticum as the most effective plant in controlling temperature. At $22^{\circ}C$, $3.2^{\circ}C$ temperature reduction was observed, whereas four other plants showed a $1.5^{\circ}C$ reduction. At $25^{\circ}C$, $2.0^{\circ}C$ temperature reduction was observed. On the other hand, the use of Sedum sarmentosum resulted in the lowest effect. Zoysia japonica is the most commonly used ground covering plant, although the temperature reduction of Lysimachia nummularia was more effective at high temperature conditions. Sensible heat and latent heat were calculated to evaluate the thermal performance of energy. At a temperature >$30^{\circ}C$, L. nummularia and S. sarmentosum emitted high latent heat. In this study, we analyzed the thermal performance of green roof perennial plants; in particular, we analyzed the evapotranspiration and temperature reduction of each plant. Since the substrate depth and types, plant species, and seasonal change may influence temperature reduction and latent heat of green roofs, further studies are necessary.

• 한국조경학회지
• /
• 제40권3호
• /
• pp.91-98
• /
• 2012

본 연구는 저토심 무관리형 옥상녹화시스템을 위한 토양배합이 세덤류 생육에 미치는 영향을 연구하여 생육 적정성 토양배합을 파악하고자 하였다. 식생모듈박스를 이용하여 토심 7cm, 5종 토양배합비가 있어 2010년 12월부터 5층 옥상에서 실시하였다. 식물의 생육현황은 P5C7P2V1이 가장 우수한 것으로 나타났으며, 다음으로 P10C7P2V1과 P1P1V1, P1과 C1의 생육이 가장 저조한 것으로 나타났다. 실험 경과, P5C7P2V1의 토양배합비에서 효과가 가장 양호하게 나타나, 도시내 대면적 녹화에 기여할 수 있는 토양배합비로 판단된다.

• Journal of Plant Biotechnology
• /
• 제40권2호
• /
• pp.79-87
• /
• 2013

본 연구의 목적은 세계적 희귀 및 멸종위기식물인 주걱비름(Sedum tosaense Makino)의 잎절편으로부터 식물체 재분화 조건의 탐색과 광독립배양을 통한 원활한 토양순화 체계을 확립하고자 하였다. 생장조절제인 BA와 NAA를 조합한 MS배지에 주걱비름 기내발아 식물체의 잎절편을 배양하였다. $2.0mg{\cdot}L^{-1}$ BA와 $1.0mg{\cdot}L^{-1}$ NAA를 혼합하여 처리한 배지가 캘러스 형성율이 100%로 가장 높았으며, 캘러스의 무게도 가장 무거웠다. 또한, 캘러스에서 분화된 신초의 수, 신초의 무게, 배양상태의 견고도에서도 $2.0mg{\cdot}L^{-1}$ BA와 $1.0mg{\cdot}L^{-1}$ NAA를 혼합하여 처리한 배지가 가장 우수하였다. 주걱비름의 대량증식을 위해 BA와 NAA를 혼합조합한 MS배지에 액아를 포함하는 마디를 배양하였다. 그 결과, $2.0mg{\cdot}L^{-1}$ BA와 $1.0mg{\cdot}L^{-1}$ NAA 혼합한 배지가 신초의 수 7.9개, 신초무게 66.9 mg으로 신초분화에 가장 효과적이었다. 기내발근을 위해 MS배지에 AC 무첨가배지와 $2.0g{\cdot}L^{-1}$ AC 첨가배지에 배양하였다. 그 결과, 뿌리의 수 85.7개, 뿌리의 길이 4.6cm로 $2.0g{\cdot}L^{-1}$ AC을 첨가한 배지가 더 효과적이었다. 광독립배양에 의한 순화전처리 시 이산화탄소의 영향을 알아보기 위해 1,200 ppm과 350ppm으로 공급하였다. 그 결과, 1,200 ppm의 $CO_2$를 공급해준 처리구가 잎수, 잎폭, 잎두께, 줄기의 길이, 뿌리의 길이, 식물체무게와 엽록소함량이 350 ppm의 $CO_2$를 공급해준 처리구보다 높게 나타났다. 기내에서 재분화된 유식물체의 토양순화는 peat moss와 perlite 혼합배양토에서 생존율이 100%로 가장 높았으며, 가장 양호한 생장을 보였다.

• Journal of Ecology and Environment
• /
• 제30권2호
• /
• pp.187-193
• /
• 2007

Higher plants can be categorized as C3, C4 or CAM according to their photosynthetic pathways, and some succulent plants are known to shift their patterns of photosynthesis from C3 to CAM in response to environmental stresses such as salt treatment or water deficiency. To investigate fundamental photosynthetic patterns and the induction of pattern shifts (C3, CAM, C3-CAM etc.) as a result of environmental stresses, we measured the water content, diurnal changes in pH, net $CO_2$ exchange, transpiration rate, total ionic contents, and osmolality of Kalancoe daigremontiana, Sedum kamschaticum and Sedum sarmentosum which belong to Crassulaceae known as representative CAM plant, after 10 days of drought treatment. S. kamschaticum and S. sarmentosum did not show a significant difference in diurnal pH variation in the treatment and control conditions. However, the pH of drought-treated Kalancoe was low at night and high in the daytime, with a pH value between 4 and 5. Typical CAM plants display a net $CO_2$ exchange that increases at night and decreases in the daytime. Kalancoe displayed the predicted pattern. However, S. kamschaticum and S. sarmentosum showed a photosynthetic pattern more typical of C3 plants, and did not show changes in photosynthetic pattern under drought stress. Kalancoe also showed a transpiration rate typical for CAM pho-tosynthesis, whereas the transpiration rates of S. kamschaticum and S. sarmentosum were in the typical range for C3 photosynthesis. Kalancoe had high total ionic contents during the night, which decreased somewhat during the daytime, whereas S. kamschaticum and S. sarmentosum displayed the opposite pattern. This result is similar to the diurnal patterns of changes in pH in the three plant species, which suggests a relationship between pH and ionic contents. S. sarmentosum showed lower osmolality under drought stress than in the control condition, whereas the osmolality of Kalancoe and S. kamschaticum did not differ between conditions. S. sarmentosum may have maintained internal water content by lowering its osmolality and raising its total ionic contents. In conclusion, Kalancoe displayed the characteristic responses of a typical CAM plant, whereas S. kamschaticum and S. sarmentosum displayed aspects of the C3 photosynthetic pattern under drought conditions. These results suggest that S. kamschaticum and S. sarmentosum (Crassulacea) in Korea overcome drought stress by increasing solute and ionic contents internally rather than changing their photosynthetic pattern from C3 to CAM under drought stress.

• 한국환경과학회지
• /
• 제25권9호
• /
• pp.1289-1297
• /
• 2016

The walls of guard cells have many specialized features. Guard cells are present in the leaves of bryophytes, ferns, and almost all vascular plants. However, they exhibit considerable morphological diversities. There are two types of guard cells: the first type is found in a few monocots, such as palms and corn, and the other is found in most dicots, many monocots, mosses, ferns, and gymnosperms. In corns, guard cells have a characteristic dumbbell shape with bulbous ends. Most dicot and monocot species have kidney-shaped guard cells that have an elliptical contour with a pore at its center. Although subsidiary cells are common in species with kidney-shaped stomata, they are almost always absent in most of the other plants. In this study, there were many different stomatal features that were associated with kidney-shaped guard cells, but not dumbbell shaped guard cells, which are present in most grasses, such as cereals. Each plant investigated exhibited different characteristic features and most of these plants had kidney-shaped guard cells. However, the guard cells of Chamaesyce supina Mold, were often more rectangular than kidney-shaped. In contrast, Sedum sarmentosum guard cells were of the sink ensiform type and in Trifolium repens, the guard cells exhibited a more rhombic shape. Therefore, kidney-shaped guard cells could be divided into a number of subtypes that need to be investigated further.

• Natural Product Sciences
• /
• 제5권4호
• /
• pp.165-171
• /
• 1999

Since reactive oxygen species (ROS) play an important role in carcinogenesis and other several human diseases, antioxidants present in consumable fruits, vegetables, and beverages have received considerable attention as cancer chemopreventive agents. Thus, in order to identify antioxidants in plant extracts, potential activity was assessed by determining with inhibition of a xanthine/xanthine oxidase assay system. Approximately 170 plant extracts of Korean herbal medicines were primarily evaluated for the potential of antioxidant activity. As a result, 13 plant extracts were found to be active $(IC_{50}$<$100\;{\mu}g/ml)$. Especially, Juncus effusus, Selaginella tamariscina, Pueraria thunbergiana and Sedum albroseum showed strong inhibitory activity in this process. Further studies for the identification of active principles from these active lead plant extracts might be warranted.

• 한국환경복원기술학회지
• /
• 제19권2호
• /
• pp.55-69
• /
• 2016

Significant efforts are being devoted in mitigating the urban heat island effect, and extensive green roofs are an option for mitigation. The purpose of this study was to compare the surface temperature, vegetation types, and plant species on an extensive green roof. Test beds were created in May 2015, and the surface temperature was monitored from June to August. The test beds comprised polyculture and monoculture. Polyculture was divided into three types, and monoculture comprised eight plant species. An extensive green roof is effective in reducing temperature by forming a shade and preventing sunlight from falling on the surface of buildings, which mitigates the urban heat island effect. Consequently, the surface temperature of the green roof and that of concrete during summer reduced from $17.8^{\circ}C$ to $7.3^{\circ}C$. The temperature reduction was greater on using polyculture than on using monoculture, but monocultures of Sedum takesimense, Hemerocallis dumortieri, Allium senescens, Aster yomena, Belamcanda chinensis, and Aster koraiensis also produced good results. The temperature reduction effects of Polygonatum odoratum var. pluriflorum f. variegatum, Phlox subulata, and Thymus quinquecostatus var. japonica were excellent compared with those of concrete but were less than those of other plant species. Careful attention is needed for the management of extensive green roofs. Studies on the plant species and types of extensive green roof should continue to mitigate the urban heat island effect.

• 한국응용곤충학회지
• /
• 제45권3호
• /
• pp.339-346
• /
• 2006

비름과 쇠무릎등 총 36과 81속 90종의 약용식물을 대상으로 당근뿌리혹선충의 감염 여부를 조사한 결과, 쇠무릎 등 70종의 식물에서 당근뿌리혹선충 감염을 확인하지 못했고, 이들 70종 중 42종의 식물을 당근뿌리혹선충에 의한 더덕의 피해가 많았던 포장에 심고, 감염여부를 조사한 결과, 쇠무릎 등 26종은 당근뿌리혹선충에 거의 감염되지 않았고, 지치 등 16종은 감염되었음을 확인하였다. 또한 42종의 식물중 30종의 식물을 Pot 재배를 통하여 당근뿌리혹선충 접종밀도별 뿌리혹수와 토양 내 유충밀도를 조사한 결과 패랭이, 원추천인국, 기린초, 아주까리, 지모, 해변아욱, 애기똥풀, 흑참깨, 짚신나물, 큰뱀무, 오이풀, 현삼 등 12종은 당근뿌리혹선충에 거의 감염되지 않았음을 확인하였다. 반면에 더덕은 당근뿌리혹선충 접종밀도가 높을수록 뿌리혹수가 많아지고, 토양 내 유충밀도 역시 높아졌으며, 이에 따라 더덕의 생육은 접종밀도가 높을수록 나빠지는 경향이었다.

• 한국환경복원기술학회지
• /
• 제14권3호
• /
• pp.71-84
• /
• 2011

The purpose of this study is to suggest sustainable management of rooftop greening areas. This research is conducted to analyze birth-and-breeding state of planted plants set in extensive rooftop greening, and to examine occurrence aspect of invasive plants and its changes, some features of invasive plants on which can make a basic material for management program of planted plants as a whole. The experimental site is on the rooftop green area of Seoul Women's University which was constructed in 2007. The using method was monitoring rooftop greening areas and analyzing occurrence aspect of invasive plants and its changes by planted plants. Invasive plants were investigated six times overall in April, June, September, November of 2008, and April & June of 2009. As a result, 26 families and 66 species were found invaded. Of which 14 species of Gramineae were invaded the most remarkably. Through these study, it could be inferred some features of invasive plants and major region for it. After the analysis get done about feature of invasive plants, it shows that some invasive plants of all 66 species in total came out, otherwise occurred in a certain time of season. Within the researches eriod showed a higher incidence was found in Artemisia princeps, Conyza canadensis, Coreopsis anceolata, Equisetum arvense, Erigeron annuus, Oxalis corniculata, invasive plant have a lower incidence of plants were identified as Aster koraiensis, Dendranthema zawadsbum. So, when the plan to set a management device regarding occurrence aspect of invasive plants in accordance with planted plants on extensive rooftop greening, it was found that a sustainable & rational management device is desperately needed there for invasive & planted plants of the target area.

• 한국조경학회지
• /
• 제41권5호
• /
• pp.1-8
• /
• 2013

이 연구는 2종의 저관리 경량형 옥상녹화시스템(세덤박스와 우수저장형 옥상녹화시스템)을 대상으로 옥상녹화 효과를 평가하기 위해 옥상의 건조한 조건에 잘 견딜 수 있는 내건성 식물 12종을 대상으로 실험을 실시하였다. 실험은 우수저장형 옥상녹화시스템의 기초 연구를 위해 식물의 내건성을 평가하였다. 식물의 내건성 평가를 위해 무관리 조건에서 12종 식물의 건조스트레스의 저항성을 평가하였다. 내건성 평가는 처리 시간에 따라 12종 식물의 상대수분함량의 변화, 전해질 용출 평가, 엽록소 함량의 변화, 토양수분과 건조 스트레스와의 관계를 연구하였다. 건조처리 시간이 길수록 식물들의 상대수분 함량과 엽록소 함량이 감소하면서, 전해질 용출이 증가하였다. 따라서 식물의 내건성 평가 결과, Pulsatilla koreana, Ainsliaea acerifolia를 제외한 10종이 내성이 강하여 옥상녹화에 적용 가능한 종으로 판단되며, 우수저장형 옥상녹화 시스템에서 식물들의 내건성은 식생박스의 식물들보다는 강한 것으로 나타났다. 따라서 우수저장형 옥상녹화 시스템이 식물의 생육과 건조조건에 대한 저항성 증진 효과가 있는 것이 증명되어 도시 옥상녹화에 이용할 수 있다.