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1

Water pollution characteristics and assessment in different functional zones

100%
Hezhong Y., Enfeng L., Wei P., Shuqing A.
Polish Journal of Environmental Studies
|
2014
|
tom 23
|
nr 2
The investigation of water pollution from mainstream and dominating tributaries at different Hydrological conditions of the Qiantang River, East China, showed that water quality tends to deteriorate from upstream to downstream and possessed severe pollution levels in the dry season rather than the abundant and medium seasons. Analysis of PCA indicated that TN, NO¯₃, NH₃¯N, and TP with maximum values of 18.70, 2.57, 15.50, and 0.80 mg·L-1 were the dominant pollution factors, therein NO¯₃ accounted for the largest percentage of TN (up to 83.1% in various nitrogen species). Domestic sewage and the discharge of poultry and animal feces were the main point source pollution, and fertilizer that flushed into the river leaching from farms possessed the maximum proportion of non-point source pollution associated with NH₃¯N and TP. P mainly came from sewage discharge simultaneously. In addition, the Dayuan River was the tributary with the most severe pollution and owned significantly higher TN and NH₃¯N concentrations than that in mainstream and the medium values, reaching up to 3.17 and 8.99 mg·L⁻¹. Low DO concentration should be an important cause for denitrification from NO¯₃ to NO¯₂ and NH₃¯N in the Dayuan River.
2

Scenario analysis of energy conservation and CO2 emissions reduction policies in China’s iron and steel sector

100%
Wei P., Coi H., Gang M.
Polish Journal of Environmental Studies
|
2017
|
tom 26
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nr 5
China’s iron and steel sector has met many obstacles, such as high energy consumption and huge CO₂ emissions. In order to deal with these problems, the Chinese government has launched a series of corresponding policies. With the assistance of Long-Range Energy Alternatives Planning System (LEAP) software, this paper established the LEAP policy model to explore performances of industry policies formulated by the government. The model consists of a baseline scenario and three policy scenarios based on different policies. Three policy scenarios in the LEAP policy model are based on policies of phasing out backward production capacity, promotion energy saving technologies, and establishment of a carbon emissions trading market. Results indicate that there is great potential for the CO₂ emissions mitigation in the iron and steel sector. The effects of four scenarios are ranked as follows: emissions trade scenario (ET) > cut excessive capacity scenario (CEC) > technology improvement scenario (TI) > business-as-usual scenario (BAU). From the point of view of the iron and steel industry, this research tries to cast light on the future performances of industrial policies, and the results reveal that CO₂ emissions would be abated significantly if those policies were successfully implemented.
3

Soybean Na+/H+ antiporter GmsSOS1 enhances antioxidant enzyme activity and reduces Na+ accumulation in Arabidopsis and yeast cells under salt stress

88%
Zhao X., Wei P., Liu Z., Yu B., Shi H.
Acta Physiologiae Plantarum
|
2017
|
tom 39
|
nr 01
4

Downregulation of the lycopene ε-cyclase gene confers tolerance to salt and drought stress in Nicotiana tabacum

45%
Shi J., Liu P., Xia Y., Wei P., Li W., Zhang W., Chen X., Cao P., Xu Y., Jin L., Li F., Luo Z., Wei C., Zhang J., Xie X., Qu L., Yang J., Lin F., Wang R.
Acta Physiologiae Plantarum
|
2015
|
tom 37
|
nr 10
Lycopene ε-cyclase (ε-LCY) functions at a branch point of the carotenoid biosynthesis pathway and modulates the ratio of lutein to the β-carotenoids. RNA interference (RNAi) and overexpression (OE) of Ntε-LCY were used to evaluate the physiological roles of ε-LCY in Nicotiana tobacum. In leaves, strong accumulation of β branch carotenoids and high expression of carotenoid biosynthesis genes resulted from suppression of Ntε-LCY expression. RNAi plants showed enhanced salt and drought tolerance, while overexpression of the Ntε-LCY gene weakened tolerance to salt and drought stress, as compared to control. Further analysis revealed that RNAi plants exhibited less water loss and had lower reactive oxygen species levels than did WT plants after both the salt and drought treatments. Further, higher levels of ABA accumulated in the RNAi lines than in the WT lines under stress conditions. These results suggest that reduced Ntε-LCY expression can improve drought and salinity tolerance in Nicotiana tabacum by enhancing their ROS scavenging ability.
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