• Korean Journal of Plant Taxonomy
• /
• v.35 no.2
• /
• pp.115-127
• /
• 2005

Two anatomical features of leaves, transverse section of midribs and petioles, were examined for nine species of five genera of Thymelaeaceae, Daphne L. -4 spp., Diarthron Turcz. -1 sp., Edgeworthia Meisn. -1 sp., Stellera L. -1 sp., Wikstroemia Endl. -2 sp., using light microscopy and scanning electron microscopy. In terms of shape of upper side, three types were observed, i.e., flattened, depressed, and raised. Outline of petioles is mostly semi-circular or circular in transverse section, with two distinct wings/weakly developed wings or without wings. Other characters besides anatomical features of leaves such as vascular bundle tissues, crystal, tannin are also described in details. Finally, we briefly discussed the systematic significance of the anatomical features of leaves for identification of Korean Thymelaeaceae.

• Korean Journal of Plant Taxonomy
• /
• v.35 no.4
• /
• pp.273-285
• /
• 2005

Genetic variation of notorious invasive plants, common ragweed (Ambrosia artemisiifolia L.) and giant ragweed (Ambrosia trifida L.) were examined using the internal transcribed spacer (ITS) sequences of nuclear ribosomal DNA. A total of 18 different ITS types were detected from 156 individuals of common ragweed sampled mainly from the southern part of Korean peninsula whereas four types were identified from 46 individuals of giant ragweed. High sequence diversity observed from common ragweed in Korean populations was interpreted as multiple introduction. Genetic recombination was suggested as possible method for the production of some of the ITS types while point mutation was mainly responsible for the origin of the sequence diversity. This study provided some of basic genetic information needed for understanding of the evolutionary process in ragweed during invasion.

• The Korean Journal of Ecology
• /
• v.26 no.5
• /
• pp.281-287
• /
• 2003

We present the first analysis of moor vegetation on the Moojechi of Ulsan including syntaxonomy and syndynamics. We classified plant communities according to the Braun-Blanquet approach. In order to better understand ecological alteration processes and changing species compositions along successional gradients we also examined synecological differences using Principal Coordinate Analysis(PCoA) in terms of moisture gradient, species richness, and community structure. Classification resulted in one association and five plant communities occupying distinct moor habitats: Hypericum laxum-Eleocharis acicularis for. longiseta community, Drosera rotundifolia-Eleocharis congesta community, Platanthero-Molinietum japonicae ass. nova hoc loco, Molinia japonica-Alnus japonica community, Miscanthus sinensis-Pinus densiflora community, and Convallaria keiskei-Quercus serrata community. Due to synecological correspondences and floristic similarities in supraregional perspective, Platanthero-Molinietum can be assigned to existing higher syntaxonomic units of Molinion and Molinietalia in Braun-Blanquet system, established in Japan. We propose to extend their range and designate the new class Molinietea japonicae representative to the intermediate moor (Zwischenmoor) vegetation in Northeast Asia. PCoA resulted in four types showing a sequencess of succession: Needle spike-rush type, moor-grass type (incl. alder forest type), eulalia type, and oak forest type. A combination of edaphic conditions (soil eutrphication and soil moisture) and hydrologic patterns of moor ecosystem related to topography, occurring as result of external geophysical forces, controls inter alia spatial patterns and floristic compositions of moor plant communities.

• Korean Journal of Plant Resources
• /
• v.26 no.2
• /
• pp.289-302
• /
• 2013

Surveys were conducted to study nationwide distribution and identify habitats and host plants of Cuscuta pentagona Engelm. as a parasite. The major habitat types were arable land near agricultural waterways (54.3%), open field near roadside (41.3%) and artificial grassland (4.3%). The investigated host plants of Cuscuta pentagona consist of total 130 taxa: 10 varieties, 1 subspecies, 119 species, 95 genera, and 37 families. Among them, 30 taxa were alien plants. As for the useful plants, there were 59 taxa of edible ones (45.4%), 54 taxa of medicinal ones (41.5%), 13 taxa of ornamental ones (10%), 13 taxa of industrial ones (10%), and 9 taxa of pasture ones (6.9%). On arable land, it caused damage particularly to the growth of agricultural crops such as Oryza sativa L. (Rice) and fruits such as Malus pumila Mill. (Apple) etc. Its growth and distribution may cause economic loss for crops because of the close location of the arable land.

• Journal of Korean Society of Forest Science
• /
• v.106 no.2
• /
• pp.130-149
• /
• 2017

The subalpine zone which is vulnerable to climate change could be functioning as a habitat for northern plant species especially in the Korean peninsula. In this study, classification of phytosociological community type and investigation on flora of vascular plants of Daecheongbong area in Mt. Seorak were carried out in order to provide a basic information for an ecological restoration and management of the vegetation through community ecological approach. Vegetation data were collected from 31 of quadrates from May to October, 2016. We analyzed vegetation types with phytosociological method, importance value with Curtis & McIntosh method, CCA using PC-ORD program tool, and flora of vascular plants. As a result, the forest vegetation was classified into Abies nephrolepis community. The community was divided 3 groups such as Pinus pumila group, Rhododendron brachycarpum group and Angelica decursiva group. Therefore, the vegetation had 3 kinds of units. The differential species group, it was classified into total of 7 species group units including Thuja koraiensis and Smilacina bicolor differential species group. The mean importance percentage (MIP) in VU 1 was shown Pinus koraiensis (24.1), A. nephrolepis (23.6) and Betula ermanii (10.5), and in VU 2, it was P. koraiensis (26.2), A. nephrolepis (20.8) and B. ermanii (10.5), and in VU 3, it was P. koraiensis (22.2), A. nephrolepis (16.4), B. ermanii (13.5) in the order, respectively. As for importance values of P. koraiensis and A. nephrolepis representative competition species, were different at each layers. The former (46.7) was higher than the latter (26.1) in tree layer, but the latter was higher than the former in subtree and, shrub and herb layers of VU 1. VU 2 and VU 3 also indicated the same tendency. P. pumila group and A. decursiva group were shown to have positive correlation with altitude and present species, respectively. The designated as the endemic plant was 11 taxa and, as the rare plant 24 taxa and 62.5% of vascular plant was northern plant species. It is necessary to continue further long-term monitoring of 3 vegetation units, IV of main competition species (P. koraiensis and A. nephrolepis) with stratum and main specific species (rare plants and endemic plants) considering vegetation science and, population and community ecology approaches.

• Korean Journal of Environmental Agriculture
• /
• v.33 no.2
• /
• pp.86-102
• /
• 2014

BACKGROUND: According to the types of human interference, there are various plants that have strong vitality and ability to breed in the dry field. Recently, climate change alters the geographical distribution and phenology of the plant species. So, we need to understand present occurrence pattern and ecological characteristics of these plants. METHODS AND RESULTS: The plant species data were obtained from 8 regions in Jeolla-do. Flora investigation was done from May 2013 to September 2013. Habitat type of dry field in Jeolla-do was classified into 3 types (inside of dry field: IDF, embankment around the end of a dry field: EDF, levee slope of dry field: LS). The vascular plants of study area were listed 296 taxa which contain 68 families, 203 genera, 244 species, 43 varieties and 9 forms. The vascular plants of three different habitat types were IDF 174 taxa, EDF 249 taxa and LS 136 taxa. The occurrence rate of Therophyte was arranged by the order of IDF(67.6%), EDF(51.9%), LS(54.3%). Naturalized rate was analysed as IDF 27.9%, EDF 21.0%, LS 18.6%. Urbanization index was analysed as IDF 11.8%, EDF 13.7%, LS 10.0%. CONCLUSION: With these results, we found that three habitat types were ecological difference affected by the human impacts. Also, we found environmental indicators through the ecological characteristics of flora for the type of habitat of dry field. These indicators will help assess the agriculture environmental variability and the floral change according to the climate change in dry field.

• Korean Journal of Environment and Ecology
• /
• v.9 no.2
• /
• pp.115-125
• /
• 1996

To investigate the plant community structure in Pinus densiflora forests of Odaesan National Park, fourty plots(each size was 100m$^{2}$) were set up in Sogumgang and Woljongsa area. The classification by the TWINSPAN and DCA ordination techniques were applied to the survey area. Pinus densiflora forests were divided into five community types, which were Betula schmidtii-Acer pseudosieboldianum-Styrax obassia, Quercus variabilis-S. obassia, Q. serrata-Q. vareabilis, Q. mongolica, Abies holo[hylla. The successional trend of Pinus densiflora forests was seem to be seral stage from Pinus densiflora to Quercus spp.. And Abies holophylla was competition species with Pinus densiflora in Woljongsa area. So, management of Pinus densiflora forests requires to conserve for the diversity of mountain landscape resource and gene science.

• Korean Journal of Plant Resources
• /
• v.16 no.2
• /
• pp.134-140
• /
• 2003

To increase self-sufficiency ratio and agricultural income, six cropping systems by introducing several crops in perilla were tested from 2001 and 2002. Weed occurrence was high in barley+perilla and safflower+perilla cropping system. Pre-and post-crops in barley+perilla and safflower+perilla showed good growth. Safflower+perilla cropping system was labor-saying and cost down because polyethylene film of pre-crop was reused in post-crop. But when perilla was introduced as post-crop of sesame, delayed seed date resulted in decreased growth and grain yield. The income in barley+perilla and safflower+perilla was greater 4.1fold and 5.2fold, respectively than in perilla mono-crop system. Soil physical properties were improved in order of safflower+perilla, barley+perilla cropping system.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2018.04a
• /
• pp.48-48
• /
• 2018

본 연구는 우리나라 산림습원의 식물종 다양성을 보존하기 위한 일환으로 충북지역 산림습원 34개소에 분포하는 관속식물 현황을 파악하고자 수행하였다. 현지조사는 2017년 4월부터 10월까지 7개월 동안 수행하였다. 조사 결과 충북지역 산림습원에 분포하는 관속식물은 총 98과 312속 502종 5아종 71변종 587분류군으로 충북지역 전체 식물상 약 1,241분류군의(국립수목원 한국관속식물분포도, 2016) 47.3%로 나타났다. 습지에 출현하는 빈도에(수생태사업단 우리나라습지생태계 관속식물의 유형분류, 2012) 따라 구분한 결과 절대습지식물은 물꽈리아재비, 큰고양이수염, 통발, 벗풀, 올챙이고랭이, 택사 등 27분류군, 임의습지식물은 버드나무, 쉽싸리, 물억새, 이삭사초, 부처꽃, 비녀골풀, 솔발울고랭이, 양뿔사초, 진퍼리새 등 51분류군이다. 또한 습원과 육지에서 동시 출현하는 양생식물은 모시물통이, 왕미꾸리광이, 물양지꽃, 좀고추나물, 감자개발나물, 참삿갓사초 등 29분류군, 임의육상식물은 쇠뜨기, 고비, 고추나물, 방동사니, 강계큰물통이, 오리새, 처녀바디 등 25분류군, 절대육상식물은 애기탑꽃, 좀진고사리, 옥잠난초, 물들메나무, 뻐국나리, 진범, 범꼬리 등 88분류군으로 확인되었다. 특히 절대습지식물 중 애기물꽈리아재비, 큰고양이수염, 개쉽싸리, 통발, 송이고랭이, 올방개아재비, 흰고양이수염 등 11분류군은 충북내에서 새롭게 분포가 확인되었다. 산림청 지정 희귀식물은 양뿔사초(CR), 애기물꽈리아재비(VU), 통발(VU) 등 16분류군, 한국특산식물은 키버들, 강계큰물통이, 물들메나무, 넓은잎각시붓꽃 등 19분류군이다. 식물구계학적 특정식물로는 V등급 통발 등 3분류군, IV등급 왜방풍 등 9분류군, III등급 음양고비 등 18분류군, II등급 12분류군, I등급 30분류군이 확인되었다. 외래식물은 큰닭의덩굴, 미국자리공, 붉은서나물 등 27분류군으로 나타났다.

• Journal of Wetlands Research
• /
• v.18 no.4
• /
• pp.331-341
• /
• 2016

A small irrigation pond for a rice paddy field is a very important refuge for aquatic insects and plants. To reveal environmental factors determining species composition of aquatic insect and plant communities, we analyzed water chemistry and connection between pond and surrounding in five types of irrigation ponds based on water source and connection in CCZ of South Korea: stagnation, exchange-stagnation, spring, stagnation-spring, and exchange-spring types. The stagnation type had the most stable water chemistry among the 16 irrigation ponds studied, and the spring type had the most variable water chemistry. Anion content was highest in the stagnation type, and cation content was highest in the exchange-stagnation type. 228 taxa including 63 wetland plants and 95 aquatic insect taxa were recorded. Six rare plant species and four rare aquatic insect species were identified. The stagnation-spring type had the highest species richness. There was no correlation between size and species richness. Multivariate analyses showed distinctive species assemblages among the irrigation pond types. This would indicate that water chemical change at annual cycle and connection influenced on the species assemblages in irrigation pond. In additional, irrigation pond contributes to regional biodiversity in agricultural areas, as irrigation pond provides heterogeneous communities for the freshwater ecosystem.