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게시판 (13,048)
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Growth and nutrient responses of Betula platyphylla, Larix kaempferi, and Chamaecyparis obtusa to di
2021-12-28
We investigated the effects of different placement methods of applying slow-release fertilizer on the growth and foliar nutrientsof three contrasting tree species (i.e., fast-growing Betula platyphylla and Larix kaempferi and slow-growing Chamaecyparis obtusa) to provide implications for increasing their growth and survival in marginal forest lands. We applied 84 g pot–1 of solid compound fertilizer (SCF) at different positions: no fertilization (CON), subsurface placement (SCFs), and bottom placement [35-cm depth (SCFb)] in a greenhouse condition. Results revealed that the height and RCD (root collar diameter) of the three species had the highest growth under SCFs. Total biomass across SCFs, SCFb, and CON ordered as follows 130, 72, and 28 g seedling–1 in B. platyphylla, 89, 38, and 27g seedling–1 in L. kaempferi, and 61, 24, and 23 g seedling–1 in C. obtusa. In contrast, SCFb resulted in the highest root length across the treatments in all species. The root biomass allocation was also higher in SCFb (28%–40%) than that of SCFs (12%–24%). SCFs had higher N uptake in all species than the other treatments. In conclusion, SCFs has shown to be the most effective placement method of SCF application for increasing aboveground biomass and nutrient (N) acquisition, while SCFb was the placement effective for increasing root length and root biomass growth in all species. These results are relevant to the promotion of ecofriendly and cost-effective fertilization approach of increasing growth and survival of economically important forest tree species, especially in steep slope and erosion-prone areas or marginal forest lands.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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용기종류에 따른 자작나무 용기묘의 생장 및 생리적 특성 변화
2021-12-28
초록 본 연구는 우리나라 주요 조림수종이자 북한 산림 복구에 활용이 예상되는 자작나무(Betula platyphylla var. japonica Hara)의 용기묘 생산에 필요한 적정 용기 개발에 관한 기초 자료를 구축하고자 수행되었다. 상기 목적에 따라 실시된 실험에서 자작나무를 용적과 생육밀도가 다른 용기에서 생육시켜 생장 특성을 조사하였다. 실험용기는 국내에서 생산되는 임업시설양묘용 플라스틱 용기 6종(KK-SI 500, SI 350, KK-SI 350, KK-SI 320, KCNR-SI 300, KCNR-SI 250)을 사용하였으며, 생장이 활발한 8월과 생장이 끝난 10월 총 2회에 걸쳐 생장을 측정하였다. 수고, 근원경 생장과 묘목 전체 건물생산량은 1차와 2차 측정 모두 SI 350 용기에서 각각 32.0 ㎝, 2.81 ㎜, 1.04 g과 38.6 ㎝, 3.89 ㎜, 2.52 g로 가장 높게 조사되었다. 이에 따른 묘목품질지수 또한 SI 350에서 0.184로 가장 높은 값을 보였다. WinRHIZO 프로그램을 이용한 뿌리형태 특성 분석에서도 전체뿌리길이는 SI 350에서 3345.6 ㎝로 가장 길었고, 뿌리 투영단면적과 및 표면적, 뿌리부피 또한 전체뿌리길이와 유사한 경향을 보였다. 종합적으로, KK-SI 500보다 구 용적이 더 작은 SI 350에서 생장이 우수했다는 점에서 용기의 형태 또한 자작나무 용기묘 생장에 큰 영향을 주는 것으로 판단되었다.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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산꼬리풀 삽수의 생장에 미치는 몇 가지 요인
2021-12-28
ABSTRACT Veronica rotunda var. subintegra (Nakai) T. Yamaz. is perennial herb belonging to the family Scrophulariaceae, native to Korea. Plant growth regulators, cutting mediums, cutting position, and leaf size were examined to investigate the requirements for cutting propagation of V. rotunda var. subintegra. This study was conducted over a period of 6 weeks from March to May 2017 in the Division of Plant Resources, Korea National Arboretum. For all treatments, survival and rooting percentage was 100%. In PGRs experiment, the number of roots and shoot length treated with 100 ㎎/L IBA treatment was significantly higher than that of NAA treatment. The shooting percentage was decreased with an increase of the PGRs concentration. In growing substrates experiment, the number of roots on commercial soil (61.2) was the highest, followed commercial + kanuma soil (45.7), and the lowest was kanuma soil (41.8). The shoot length treated with commercial soil (8.9㎝) was significantly greater than that of kanuma soil (4.1 ㎝). In cutting positions experiment, the number of roots treated with apical (56.6) was significantly higher than that of basal (38.8). In leaf-cut experiment, the number of roots and of shoot length treated with full leaf was significantly higher than that of half leaf. As a result, we recommend treating cuttings with 100 ㎎/L IBA treatment, commercial soil, apical position, and full leaf for successful cutting propagation of V. rotunda var. subintegra.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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Saussurea namhaedoana (Compositae), a new species from Namhaedo Island, Korea
2022-12-23
ABSTRACT: Saussurea namhaedoana, a new endemic species narrowly restricted to Namhaedo Island of Korea, is reported in this study. It can be distinguished from other congeneric species of Saussurea in Korea by having persistent radical leaves until flowering, hastate or sagittate leaves with mucronate toothed to undulate-lobulate margins, grayish cobwebby hairs on abaxial leaf surfaces when young, and tubular involucre with grayish cobwebby hairs. Morphologically, S. namhaedoana is closely related to other species in Korea, such as S. gracilis Maxim., S. insularis Kitam., S. seoulensis Nakai and S. albifolia M. J. Nam and H. T. Im, sharing grayish or white hairs on the abaxial leaf surfaces. It, however, can be distinguished from its close relatives by having a distinct leaf shape, i.e., sagittate or hastate leaves. The phylogenetic relationship relative to congeners in East Asia is yet to be determined.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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RE: 선인장을 키우는데 쓰러졌어요.
2025-06-04
HOME > 마이페이지 > 활동내역 > 반려식물 Q&A 제출내역
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RE: 실버레이디 고사리
2025-06-04
HOME > 마이페이지 > 활동내역 > 반려식물 Q&A 제출내역
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RE: 홍콩야자
2025-06-04
HOME > 마이페이지 > 활동내역 > 반려식물 Q&A 제출내역
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남한 및 백두산일대 분비나무림의 군집구조
2021-12-28
초록 본 연구의 목적은 남한 및 백두산일대 분비나무림의 군집구조를 확인하여 보전 및 관리를 위한 기초자료를 구축하는데 있다. 해발 1,000m 이상의 분비나무림 우점지역을 대상으로 총 470개소의 방형구를 설치하여 임분조사를 실시하였다. 조사시기는 2019년 7월부터 2020년 10월까지 수행되었다. 연구결과 군집은 크게 4개의 군집으로 신갈나무-사스래나무 군집, 분비나무 순군집, 주목 군집 그리고 신갈나무 군집으로 분류되었다. 분비나무 개체군의 흉고직경급은 역 J자형의 임분구조로 분석되었다. 국내 및 백두산 일대까지의 분비나무림의 하층식생은 임분이 안정화됨에 따라 낮은 종다양성지수를 나타낼 것으로 판단되었다. 향후 분비나무림의 쇠퇴지역과 유지지역에 대한 모니터링을 통하여 보전과 이용적 측면을고려한 산림경영이 필요할 것으로 판단된다.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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Effects of Thinning Intensity on Litterfall Production, Soil Chemical Properties, and Fine Root Distribution in Pinus koraiensis Plantation in Republic of Korea
2024-06-04
Abstract : It is crucial to evaluate the effects of thinning on litterfall production, soil chemical properties, and fine root dynamics when implementing thinning as a silvilcultural technique to enhance tree growth and timber yield in Pinus koraiensis plantations. Thus, we determined the 10-year effects (2007–2017) of different thinning intensities on litterfall production, soil chemical properties, and fine root biomass and necromass within a P. koraiensis plantation in South Korea. The soil chemical parameters and fine root biomass and necromass were also compared across three soil depths (0–10, 10–20, and 20–30 cm). Three thinning treatments were employed: no thinning (CON), light thinning (32% removed, LT), and heavy thinning (64% removed, HT). Results revealed that litterfall was consistent across all thinning treatments, but broadleaf species had considerably higher litterfall production at HT stands than at CON/LT stands. Soil chemical properties, except exchangeable K+, were generally lower at LT stands, particularly at a depth of 20–30 cm soil. After ten years, there was a decrease in fine root biomass and necromass with increasing soil depth. Over 80% of fine roots were found in the upper layer (0–20 cm), while very fine roots (0–1 mm) consisted mainly of 47% pine and 53% other species and were concentrated in the 0–10 cm soil depth in HT. In conclusion, different thinning intensities had diverse effects on the parameters measured within the plantation. Future studies can explore how the effects of thinning intensities on litterfall production, soil chemistry, and fine root dynamics affect species diversity, carbon storage, and understory vegetation in P. koraiensis plantations.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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Characterization of L-Arabinose Isomerase from Klebsiella pneumoniae and Its Application
2022-12-23
Abstract: D-Tagatose, a functional sweetener, is converted from D-galactose by L-arabinose isomerase, which catalyzes the conversion of L-arabinose to L-ribulose. In this study, the araA gene encoding L-arabinose isomerase from Klebsiella pneumoniae was cloned and expressed in Escherichia coli, and the expressed enzyme was purified and characterized. The purified L-arabinose isomerase, a soluble protein with 11.6-fold purification and a 22% final yield, displayed a specific activity of 1.8 U/mg for D-galactose and existed as a homohexamer of 336 kDa. The enzyme exhibited maximum activity at pH 8.0 and 40 ◦C in the presence of Mn2+ and relative activity for pentoses and hexoses in the order L-arabinose > D-galactose > L-ribulose > D-xylulose > D-xylose > D-tagatose > D-glucose. The thermal stability of recombinant E. coli cells expressing L-arabinose isomerase from K. pneumoniae was higher than that of the enzyme. Thus, the reaction conditions of the recombinant cells were optimized to pH 8.0, 50 ◦C, and 4 g/L cell concentration using 100 g/L D-galactose with 1 mM Mn2+. Under these conditions, 33.5 g/L D-tagatose was produced from D-galactose with 33.5% molar yield and 67 g/L/h productivity. Our findings will help produce D-tagatose using whole-cell reactions, extending its industrial application.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
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