상수리나무와 졸참나무 잎 노화의 비교 생리생태

박용목 청주대학교 2018 産業科學硏究 Vol.36 No.1

Ecophysiological traits related to autumnal leaf senescence was assessed using two representative deciduous tree species in Korea. On early November, maximum photosynthetic rate (Pmax) of Q. acutissima was markedly reduced to 41.5% of initial value on October 25, while Q. serrata maintained relatively high level, showing 72.3% of Pmax. In particular, chlorophyll a and total chlorophyl content in Q. acutissima decreased even to 90.9 % and 88.2 % respectively, compared to those on October 25. On the other hand, Q. serrata showed 57.3% and 57.8% level in chlorophyll a and total chlorophyll content on same day. Furthermore, Q. acutissima showed 50% reduction in leaf nitrogen content both per area (Na) and per mass (Nm) on November 7. However, Q. serrata maintained almost same level in Mm though 30% reduction was shown in Na. Reduction in both chlorophyll content and nitrogen content must be responsible for the different photosynthetic responses between the two species in autumnal senescence. However, there was no difference between the two species in reduction of LMA during senescence process. From these results it is concluded that Q. acutissima responds more sensitively to lowered air temperature than Q. serrata, resulting in induction of early senescence of leaves.

환경 지표식물 개발을 위한 기초적 연구

박용목 청주대학교 산업과학연구소 1996 産業科學硏究 Vol.14 No.-

To screen indicator plants representing environmental conditions, the habitat characteristics and dry matter production were analyzed in the three stands of Persicaria thunbergii community. There were the differences in physico-chemical environments among stands. One of the stands was exposed to high air temperature, low relative humidity and soil water content resulting from high photon flux density. The others showed representative environmental conditions in forest with low air temperature, high relative humidify and soil water content due to light interception by canopy. Plant dry matter in the stands correlated closely with photon flux density and plant nitrogen Vertical allocation of dry mass and nitrogen depending on light conditions was responsible for the difference in matter production among stands.

Tennessee Williams의 劇作品에 나타난 女人像

박용목 경기대학교연구교류처 1986 論文集 Vol.18 No.-

W.B. Yeats의 二重性에 關한 硏究

박용목 경기대학교연구교류처 1983 論文集 Vol.13 No.-

참박의 수분관계와 효소활성에 미치는 수분스트레스의 영향

박용목 청주대학교 산업과학연구소 2007 産業科學硏究 Vol.24 No.2

The effect of water stess on water relations and enzyme activity of Lagenaria leucantha S. using as most grafting stock of watermelon plants was studied. In the process of soil drying water stress treatment had no effect on leaf water potential and stomatal conductance for 4 days after the cessation of watering. Thereafter, stomatal conductance and transpiration rate of well watered plants remained high but those of unwatered plants dropped markedly. The POD (peroxides) and SOD (superoxide disputes) activities were increased in water-stressed plants compared with in well-watered plants.

The Iceman Cometh의 아이러니

박용목 경기대학교인문과학연구소영어영문학회 2000 경기영문학 Vol.6 No.-

자작나무와 느티나무의 비교 수분관계에 관한 연구

박용목 청주대학교 산업과학연구소 1992 産業科學硏究 Vol.10 No.-

Diurnal water relations were monitored to evaluate plant responses to environmental water stress in trees of Betula platyphylla var. japonica and Zeikova serrata on the campus of Chongju university in Chongju. Measurements of diurnal cycles of aboveground environmental conditions were taken to ascertain environmental water stress. Xylem pressure potential, leaf conductance, osmotic potential, and turgor potential were measured to evaluate plant adaptations to environmental water stress. The climatic conditions at the research site produced severe water stress conditions in August. Midday xylem pressure potential were decreased to -14.1 bars for Zeikova serrata and -16.5 bars for Betula platyphylla var. japonica when 7-rainless days were continued. Moreover, reduced xylem pressure potential during the daytime could not recover the level of predawn xylem pressure potential even at 8 p.m. The peak of daily leaf conductance was changed with degree of water stress in both species. Based on these findings, it is concluded that plants are subjected to severe water stress during a prolonged rainless period in summer season even in regions with high precipitation and plants avoid severe water stress by modifying their leaf conductance.

광조건에 따른 식물의 엽온 특성

박용목 한국환경과학회 2011 한국환경과학회지 Vol.20 No.12

To evaluate heat environment surrounding plants diurnal change of leaf temperature in the broad-leaved deciduous and evergreen trees was measured with microclimatic environmental factors including global solar radiation, and upward and downward long wave radiation. Maximum daily solar radiation was 961.2 and 976.3 w/m^2 in August 9 and 23, respectively. Upward long wave radiation was slightly higher than downward long wave radiation, showing 404.2 w/m^2 in August 9 and 394.5 w/m^2 in August 23. In addition, daily maximum vapor pressure deficit was 5.42 and 6.84 kPa in August 9 and 23, respectively, indicating high evaporative demand. Quercus glauca and Acer mono was differently responded to changing light regimes. On August 9, leaf temperature at the top-positioned leaves of Acer plants was higher than air temperature as well as those of Quercus plants in the morning. This indicates that stomata in Acer plants were closed by heat stress or water stress in the morning, while Quercus plant maintained active transpiration by opening stomata. These results indicated that improved light regimes such as gap opening in the closed forest may not always affect positively in the physiology of understory plants.

미국자리공의 생산구조적 특성

박용목 청주대학교 2011 産業科學硏究 Vol.28 No.2

The productive structure of Phytolacca americana L. was analyzed to clarify the characteristic of matter production in relation to light utilization. Vertical distribution of photosynthetic and non-photosynthetic organs in a community was evaluated. Most of foliage was distributed in the upper 3-4 layers, whereas stem was almost evenly distributed except the upper 3 layers occupied by reproductive organs such as flowers and fruits. About 80 % of incident light was absorbed by upper layered foliage which has higher nitrogen content than those in the lower parts of plant, indicating efficient allocation of nitrogen for efficient matter production.

자작나무와 느티나무의 노화

박용목,박범진 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2

From the early October to November, 1997, changes in leaf chlorophyll content, specific leaf weight and leaf nitrogen content were studied in two deciduous tree species, Betula platyphylla var. japonica and Zelkova serrata. In early November, total chlorophyll content was reduced to 10 % and 40 % in Zelkova and Betula leaves, respectively. A slight change of specific leaf weight and leaf nitrogen content in B. platyphylla var. japonica was shown for 25 days, while those in Z. serrata were markdly changed. The differences in leaf nitrogen content and specific leaf weight between the two species during secenescence indicate a species-specific strategy on matter utilization. which is responsible for a different geographical distribution between the two species.