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Correlation of tree ring growths of four major species with climate changes in South Korea
Thi-Hoan Luong,이계한,장경수,임형우,최우정 한국산림과학회 2013 Forest Science And Technology Vol.9 No.4
Annual tree rings of Pinus densiflora, Quercus variabilis, Larix leptolepis, and Cryptomeria japonica were analyzed toexamine the correlations of annual ring growth of these species with environmental variables. In all four species, annualring area was increased over time and affected by integration of climate changes and atmospheric pollutants in the forestecosystem. C. japonica ring growth was larger than that of other species. The annual growth rings of P. densiflora andC. japonica increased with increasing temperature (p < 0.05). The significant impacts of NO2 concentration on annual ringgrowth of C. japonica (p < 0.05) might reflect the nitrogen deposition. The relation of CO2 concentration with annual ringgrowth of C. japonica (p < 0.001) could suggest that annual ring growth of C. japonica decreased with increasing CO2concentration, probably due to stomatal closure. The effects of SO2 concentration on annual ring area of P. densiflora,L. leptolepis, and C. japonica (p < 0.05) along with the correlation of O3 concentration with ring growth of P. densiflora(p < 0.05) could be due to acid deposition. The relationships of precipitation pH with annual ring growth of P. densiflora (p< 0.05) and Q. variabilis (p < 0.01) might reflect the change of nutrient cycles in the forest ecosystem. Therefore, annualring growths of four tree species depended on environmental factors in the study area. Integrated effects of climate changeand atmosphere pollutants on tree growth in the study might reflect the problem of acidification in the forest ecosystem.
Thi-Hoan Luong,이계한,장경수,최우정 한국생태학회 2013 Journal of Ecology and Environment Vol.36 No.1
Annual ring formation is considered a source of information to investigate the effects of environmental changes caused by temperature, air pollution, and acid rain on tree growth. A comparative investigation of annual ring growth of Cryptomeria japonica in relation to environmental changes was conducted at two sites in southern Korea (Haenam and Jangseong). Three wood disks from each site were collected from stems at breast height and annual ring growth was analyzed. Annual ring area at two sites increased over time (p > 0.05). Tree ring growth rate in Jangseong was higher than that in Haenam. Annual ring area increment in Jangseong was more strongly correlated with environmental variables than that in Haenam; annual ring growth increased with increasing temperature (p < 0.01) and a positive effect of NO2 concentration on annual ring area (p < 0.05) could be attributed to nitrogen deposition in Jangseong. The correlation of annual ring growth increased with decreasing SO2 and CO2 concentrations (p < 0.01) in Jangseong. Variation in annual growth rings in Jangseong could be associated with temperature changes and N deposition. In Haenam, annual ring growth was correlated with SO2 concentration (p < 0.01), and there was a negative relationship between precipitation pH and annual ring area (p < 0.01) which may reflect changes in nutrient cycles due to the acid rain. Therefore, the combined effects of increased CO2, N deposition, and temperature on tree ring growth in Jangseong may be linked to soil acidification in this forest ecosystem. The interactions between air pollution (SO2) and precipitation pH in Haenam may affect tree growth and may change nutrient cycles in this site. These results suggested that annual tree ring growth in Jangseong was more correlated with environmental variables than that in Haenam. However, the further growth of C. japonica forest at two sites is at risk from the long-term effects of acid deposition from fossil fuel combustion.
Thi-Hoan Luong,Dang-Minh-Chanh Nguyen,Thi-Nga Trinh,Viet-Cuong Han,Woo-Jin Jung 한국응용생명화학회 2022 Journal of Applied Biological Chemistry (J. Appl. Vol.65 No.4
In recent years, research into medicinal herbs with antioxidative activities has increased. Chrysanthemum morifolium and Chrysanthemum indicum are aromatic herb plants and that have long been used in traditional Vietnamese medicine. This study aims to evaluate the chemical compositions and antioxidative activities of essential oils hydrodistilled from the flower heads of C. morifolium and C. indicum. The chemical compositions of the essential oils were compared using gas chromatography/mass spectrometry (GC/MS) analysis. The antioxidative activity was determined and evaluated spectroscopically by the 2,2-diphenyl- 1-picrylhydrazyl (DPPH) radical scavenging, metal chelating activity, reducing power, and total antioxidant capacity assays. According to the GC/MS results, chrysanthenone was predominant in the essential oils of both C. morifolium (64.14%) and C. indicum (32.02%). This is the first report of the identification of chrysanthenone as a major constituent of the essential oil of C. morifolium. Both Chrysanthemum oils were also revealed to possess antioxidant potential, exhibiting high antioxidative activities. In particular, the DPPH radical scavenging activities of the C. morifolium and C. indicum oils at a concentration of 100 mg/mL were 76.9 and 83.2%, respectively. The metal chelating values of C. morifolium and C. indicum were 0.85 and 0.76, whereas the reducing power values of that at 100 mg/mL were 0.76 and 0.71, respectively. This study provides the chemical properties of the essential oils of both C. morifolium and C. indicum grown in Vietnam and their potential antioxidant capacity
Luong, Thi-Hoan,Jang, Kyoung-Soo,Choi, Woo-Jung,Lee, Kye-Han The Ecological Society of Korea 2013 Journal of Ecology and Environment Vol.36 No.1
Annual ring formation is considered a source of information to investigate the effects of environmental changes caused by temperature, air pollution, and acid rain on tree growth. A comparative investigation of annual ring growth of Cryptomeria japonica in relation to environmental changes was conducted at two sites in southern Korea (Haenam and Jangseong). Three wood disks from each site were collected from stems at breast height and annual ring growth was analyzed. Annual ring area at two sites increased over time (p > 0.05). Tree ring growth rate in Jangseong was higher than that in Haenam. Annual ring area increment in Jangseong was more strongly correlated with environmental variables than that in Haenam; annual ring growth increased with increasing temperature (p < 0.01) and a positive effect of $NO_2$ concentration on annual ring area (p < 0.05) could be attributed to nitrogen deposition in Jangseong. The correlation of annual ring growth increased with decreasing $SO_2$ and $CO_2$ concentrations (p < 0.01) in Jangseong. Variation in annual growth rings in Jangseong could be associated with temperature changes and N deposition. In Haenam, annual ring growth was correlated with $SO_2$ concentration (p < 0.01), and there was a negative relationship between precipitation pH and annual ring area (p < 0.01) which may reflect changes in nutrient cycles due to the acid rain. Therefore, the combined effects of increased $CO_2$, N deposition, and temperature on tree ring growth in Jangseong may be linked to soil acidification in this forest ecosystem. The interactions between air pollution ($SO_2$) and precipitation pH in Haenam may affect tree growth and may change nutrient cycles in this site. These results suggested that annual tree ring growth in Jangseong was more correlated with environmental variables than that in Haenam. However, the further growth of C. japonica forest at two sites is at risk from the long-term effects of acid deposition from fossil fuel combustion.
( Dang-minh-chanh Nguyen ),( Thi-hoan Luong ),( Xuan-hoa Nguyen ),( Woo-jin Jung ) 한국키틴키토산학회 2021 한국키틴키토산학회지 Vol.26 No.2
In this study, we aimed to evaluate the nematicidal activity of cinnamon bark extracts (CE) and chitosan (Cs) against Meloidogyne incognita under in vitro, pot, and field conditions. In the pot experiments, CE mixed with Cs effectively inhibited M. incognita infection on black pepper plants. We applied the following formulations, which all significantly reduced the gall index and nematode number in 5 g of root and 100 g of soil: CE:Cs = 5 mg:20 mg, 10 mg:40 mg, and 15 mg:60 mg per pot. In addition, the application of CE:Cs = 32 mg:120 mg, 64 mg:240 mg, and 96 mg:360 mg per plant effectively reduced root gall formation and nematode density in black pepper roots and soil compared with that of the non-treated control under field conditions. Nematode density in the black pepper roots was positively correlated with the percentage of plants with yellow leaves. These results suggest that cinnamon mixed with chitosan may be used as an effective and eco-friendly pesticide against plant parasitic nematodes.
Dang-Minh-Chanh Nguyen,Thi-Hoan Luong,Tien-Chung Nghiem,Woo-Jin Jung 한국응용생명화학회 2023 Journal of Applied Biological Chemistry (J. Appl. Vol.66 No.-
The aim of the present study was to evaluate the chemical composition and antioxidative activity of rhizome essential oil of Kaempferia parviflora Wall. ex Baker. The essential oil extracted by hydrodistillation was chemically profiled by GC/MS analysis. The antioxidative activity was determined and evaluated spectroscopically by the 2,2-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging assays. According to the results, the major essential oil components were camphene (18.03%), β- pinene (14.25%), a-pinene (12.38%), endo-borneol (10.23%), β- copaene (8.38%), and linalool (8.20%). K. parviflora rhizome oil possessed antioxidant potential, exhibiting DPPH and ABTS radical scavenging activities as high as 80.90 and 94.04%, respectively, at a concentration of 10 mg/mL. The corresponding IC50 values were 0.451±0.051 and 0.527±0.022mg/mL, respectively (IC50 values for ascorbic acid, as the standard, were 0.209±0.016 and 0.245±0.022 mg/mL, respectively). The mycelium of F. oxysporum was distorted and collapsed when treated with 0.5 mg/ mL of the EO of K. parviflora rhizome for 3 days treatment, which may provide an important information for exploring the metabolism of the fungicide K. parviflora rhizome and its derived compounds against F. oxysporum. This study provides the chemical properties of the essential oil of K. parviflora rhizome grown in Vietnam and their potential antioxidant and antifungal activities.
Dang-Minh-Chanh Nguyen,Thi-Hoan Luong,Van-Viet Nguyen,Woo-Jin Jung 한국응용생명화학회 2023 Journal of Applied Biological Chemistry (J. Appl. Vol.66 No.-
This study evaluated the in vitro nematicidal activity of Glycyrrhiza uralensis root extracts (GuRE) on Meloidogyne incognita eggs and juveniles. The results showed that treatment of M. incognita eggs with 2.0 mg/mL GuRE for 5 and 10 d resulted in 64.0 and 68.1% hatch inhibition, respectively. Furthermore, the relative mortality of J2 was 96.2% after treatment with 2.0 mg/mL GuRE for 48 h. Changes in the shape of the eggs and juveniles were determined after incubation with 2.0 mg/mL GuRE for 5 d and 48 h, respectively. These preliminary results suggest that GuRE can be used as an environment-friendly bio-nematicide to control root-knot nematodes. In the future, in vivo assays should be conducted using GuRE to ascertain its potential for widespread application as a nematicide.