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Gui R.-Y.,Jilin University | Gui R.-Y.,Nurturing Station for the State Key Laboratory of Subtropical Silviculture | Gui R.-Y.,Zhejiang Agriculture And forestry University | Liang W.-W.,Jilin University | And 11 more authors.
Asian Journal of Chemistry | Year: 2014

The composition of the essential oils obtained by hydrodistillation of different geographical origin of Chimonanthus praecox, including Hangzhou and Wenzhou samples, were investigated by GC/MS. Forty three components comprising 93.05 % of the leave oils from Hangzhou plant, and 32 components comprising 94.26 % of the leave oils from Wenzhou plant were identified. The major components in the leaf oil from Hangzhou samples were (-)-alloisolongifolene (10.20 %), caryophyllene (9.31 %), elixene (8.52 %), germacrene D (7.30 %), germacrene B (7.44 %), δ-cadinene (6.17 %) and β-elemen (4.67 %). While, the oil from Wenzhou samples contained furan, 3-(4,8- dimethyl-3,7-nonadienyl)-, (E)-(21.69 %), eucalyptol (19.02 %), terpilene (12.41 %), p-menth-1-en-8-ol (6.65 %) and geraniol (5.29 %) as the major components. The antifungal activity of the oils against 8 phytopathogenic fungi was tested by determining minimum inhibitory concentrations using the microdilution method. Both oils exhibited potent antifungal activities with MIC values of 8-32 μg/mL. Both oils were considered bioactive, showing an LC50 value of 30 and 22 μg/mL in the Artemia salina lethality test.

Liu J.,Zhejiang iversity | Liu J.,Nurturing Station for the State Key Laboratory of Subtropical Silviculture | Chen X.-S.,Zhejiang iversity | Chen X.-S.,Nurturing Station for the State Key Laboratory of Subtropical Silviculture | And 8 more authors.
Chinese Journal of Applied Ecology | Year: 2015

CO2, N2O and CH4 are important greenhouse gases, and soils in forest ecosystems are their important sources. Carya cathayensis is a unique tree species with seeds used for high-grade dry fruit and oil production. Understory vegetation management plays an important role in soil greenhouse gases emission of Carya cathayensis stands. A one-year in situ experiment was conducted to study the effects of understory removal on soil CO2, N2O and CH4 emissions in C. cathayensis plantation by closed static chamber technique and gas chromatography method. Soil CO2 flux had a similar seasonal trend in the understory removal and preservation treatments, which was high in summer and autumn, and low in winter and spring. N2O emission occurred mainly in summer, while CH4 emission showed no seasonal trend. Understory removal significantly decreased soil CO2 emission, increased N2O emission and CH4 uptake, but had no significant effect on soil water soluble organic carbon and microbial biomass carbon. The global warming potential of soil greenhouse gases emitted in the understory removal treatment was 15.12 t CO2-e·hm-2·a-1, which was significantly lower than that in understory preservation treatment (17.04 t CO2-e·hm-2·a-1). ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.

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