Papers by Author: Xing Yuan He

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Authors: Hong Song, Wei Chen, Xing Yuan He, Shuai Yu, Yan Qing Huang
Abstract: A manipulative indoor experiment was conducted to study the removal effect on total phosphorus (TP) by three hydrophyte plant species, Iris sanguinea, Acorus calamus, and Iris pseudacorus. The nutrient solution consisted two levels of phosphorus (P) treatment [low (1 mg L-1 P) and high (4 mg L-1)]. The experiment results show that all three plant species had an active effect on the phosphorous removal, and abilities of remove phosphorous vary among different macrophyte species. After 28days growing in the water, the removal rates on TP, at the low level (T1) treatment, were 88.6%, 87.66% and 91.68% by Iris sanguinea, Acorus calamus, and Iris pseudacorus, while 86.77%, 53.51% and 94.42% at the high level treatment (T2). Speed of the pollutants decreasing become slower over time, and removal effects of TP was more obvious during the first 3 weeks. Keywords: hydrophytes, TP, removal efficient, eutrophical
Authors: De Wen Li, Yi Shi, Xing Yuan He, Guang Yu Chi, Wei Huang
Abstract: Emission rate of biogenic volatile organic compound (BVOC) released by ginkgo (Ginkgo biloba linn) was estimated from May to October 2007 in Shenyang, China. The released volatiles were collected from branches enclosed in sampling bags onto cartridges filled with Tenax-TA / Carboxen 1000 / Carbosieve SIII, and then quantified by thermal desorption gas chromatography. Isoprene was the main BVOC emitted from ginkgo in May and almost half BVOC emission was limonene during the period (from June to October). The BVOC emission rate increased from May, and reached maximum 42.21 μg g-1 dw h-1 in mid-June, then decreased quickly. Moreover, our study showed that the diurnal change of BVOC emission rate reached its maximum 32.31 µg•g-1dw•h-1 at 9:00 am, and 89.4% of the total emission was limonene. The emissions of isoprene and ocimene were correlated to both temperature (p<0.05) and light level (p<0.05).
Authors: Wei Huang, Xing Yuan He, Chang Bing Liu, De Wen Li
Abstract: To investigate the effect of elevated CO2 and O3 on the accumulation of flavonoids in Ginkgo Biloba leaves, four-year-old trees were exposed in open-top chambers with ambient and twice ambient CO2 and O3 concentrations singly and in combination in 2006. The results show that elevated CO2 reduce the concentrations of keampferol aglycon (-10%), isorhamnetin aglycon (-15%). Elevated O3 reduce the concentrations of the isorhamnetin aglycon (-7%), but increase the concentration of quercetin aglycon (+6%). Under elevated CO2 and O3 in combination, O3-derived effects on flavonoids concentrations are changed by elevated CO2, which are similar to that under the elevated CO2 alone. In conclusion, the concentrations of flavonoids are influenced by the changes in leaf dry mass induced by elevated CO2 and elevated O3. Furthermore, some flavonoids may not respond as antioxidant under ozone stress in ginkgo leaves.
Authors: De Wen Li, Yi Shi, Xing Yuan He, Yuan Gang Zu
Abstract: Isoprene and monoterpenes have indirect effects on ozone concentration, methane lifetime and aerosol formation. At the same time, the atmospheric composition change (reflected in elevated CO2 and O3 concentrations) can affect the speciation of monoterpenes / isoprenoids and magnitude of isoprene and monoterpenes fluxes. Ambient concentrations of CO2 and O3 were 342 μmolmol-1 and 40 nmolmol-1, respectively. The effects of elevated CO2 (700 μmolmol-1) and O3 (80 nmolmol-1) concentrations on isoprenoid emission rates and patterns from Pinus tabulaeformis were studied in open top chambers (OTCs). The released volatiles were quantified by thermal desorption and gas chromatography with flame ionization detector (GC-FID). The study showed that α-pinene was the main compound emitted from P tabulaeformis, accounting for more 51.5 - 72.6% of the detected volatile compounds. The emissions of isoprene and monoterpenes were reduced in response to elevated CO2 concentrations. Exposure to elevated O3 for 3 years significantly promoted the isoprene and monoterpenes emissions (p<0.05). Compared with ambient, elevated O3 concentration increased isoprene emission from P tabulaeformis by about 270.5 ± 13.5%. The response of monoterpene emission to elevated O3 may vary during the course of exposure to the pollutant. The patterns of monoterpene and isoprene emissions under combined elevated CO2 and O3 concentrations were similar to those under elevated CO2 concentration alone.
Authors: Yi Shi, De Wen Li, Ying Chen, Xing Yuan He
Abstract: Isoprene and monoterpenes are very reactive biogenic volatile organic compounds and have indirect effects on urban air quality. In this study, eight major planting tree species (six arbores and two shrubs) in Shenyang area were examined for the emission of isoprene and monoterpenes using thermal desorption instruments and gas chromatography. The results showed that there were strong seasonal variations in isoprene and monoterpenes emissions from these urban trees. The highest emission rates for Populus alba × berolinensis and Salix babylonica were observed in June with values of about 426.4µg•g-1h-1 and 100.5µg•g-1h-1, respectively. The emission flux from Salix babylonica, Populus alba × berolinensis, Pinus tabulaeformis, Gingo Biloba, Ulmus pumila, Gleditsia japonica, Syringa oblate and Ligustrum obtusifolium in Shenyang were 168.66tC•y-1, 104.86tC•y-1, 14.48 tC• y-1, 12.16 tC• y-1, 3.56tC•y-1, 1.27tC•y-1, 4.07tC•y-1 and 1.33tC•y-1, respectively. Isoprene and monoterpenes emissions pattern were depended on tree species. Populus alba × berolinensis, Salix babylonica, Syringa oblate and Ligustrum obtusifolium mainly emitted isoprene (64.5-99.7%). Other 4 tree species mainly emitted monoterpenes, amounted to 66.0-94.1% of total emission. Pinus tabulaeformis mainly emitted α-pinene. Ulmus pumila and Gleditsia japonica mainly emitted limonene. Gingo Biloba emitted isoprene and limonene, accounted for 33.99% and 39.53%, respectively. The grade of emission rates of isoprene and monoterpenes from 8 tree species was classified. Populus alba ×berolinensis was a high isoprene and monoterpenes emission tree species in summer. Salix babylonica was a medium isoprene and high monoterpenes emission tree species over growth season. These data demonstrate that rate and flux of the isoprene and monoterpenes emission from planting tree species in urban must be considered on selection of planting tree species for urban atmospheres environment.
Authors: De Wen Li, Yi Shi, Xing Yuan He, Guang Yu Chi
Abstract: In this study, seasonal biogenic volatile organic compound (BVOC) emission rates and emission patterns of Ginkgo biloba linn are estimated. The released volatiles were collected from branches onto cartridges filled with Tenax TA, and quantified by thermal desorption gas chromatography mass spectrometry (GC-MS). The result showed that the main BVOCs emitted from Ginkgo biloba linn were alkanes, aldehydes, alkenes, aromatic compounds, esters, terpenes and ketones. The total BVOC emission rate increased from May, and reached its maximum 27.96 μg C g-1dw h-1 in July, then decreased quickly. The emissions of α-pinene, isoprene, cyclohexane, methyl-cyclohexane and 2-methyl-hexane were significantly correlated to both temperature (p<0.05) and light (p<0.05).
Authors: Chang Wei Zhou, Xing Yuan He
Abstract: Based on STRATUM module of i-Tree model, total ecological benefits of street trees in Harbin is 4.5 million dollar per year, the differences between districts are very big. Ecological benefit of Nangang district Account for 22%, the highest one in the whole city, Daowai district is minimum, just 1%. Energy-saving benefit (46%) > rain interception benefits (42%) > CO2 absorption benefit (8%) > air purification benefit (4%) of street trees for the whole study area. The aesthetic benefit is greater than the other street trees ecological benefits. The highest ecological benefit per tree is yielded by Taiping district, with an average 29.81 dollar.
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