Informatics Publishing Limited

Leiming Fu ¹, Ming Yang ¹, Yifei Chen ¹

Affiliations
1 Nanjing Agricultural University, Nanjing, Jiangsu, 210031, CN

Abstract

Haze has impaired the order of public health as well as normal social and economic development. To analyse the factors influencing PM2.5 in Jiangsu province and propose specific governance strategies based on time-series data in Jiangsu from 2000 to 2014, this study identified five factors that cause haze pollution in Jiangsu. A multiple linear regression model was adopted to quantitatively measure the degrees of the effect of these factors and their significance levels. Specific measures that govern haze from the perspective of factors with significant influence were proposed. Findings show that the extensive economic growth mode, the sustainable growth of car ownership, heavy consumption of coal, the large amount of exhaust emissions in industrial production, and the large amount of dusts generated by urbanization construction are the five major factors that influence the frequency of haze PM2.5 weather in Jiangsu. Car ownership, generation of dust by housing construction, and emission of industrial exhaust significantly influence the frequency of PM2.5 weather. The regression coefficients of the three independent variables were positive and effective at the 5% significance level, and the growths of the three independent variables per unit increase haze weather by 0.457, 0.248, and 0.114, respectively. The findings of this study provide effective policy suggestions for analysing the factors that influence haze weather, adopting specific governance measures for the haze problem, and implementing environmental protection measures in Jiangsu.

Keywords

Jiangsu Province, PM2.5, Influence Factors, Governance Strategies.

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Leiming Fu ¹, Chunxia He ¹, Yifei Chen ¹

Affiliations
1 Nanjing Agricultural University, Nanjing, Jiangsu, 210031, CN

Abstract

A large number of straw resources are inefficiently used in China. Direct straw manuring is the most common method for efficiently utilizing these resources. The migration of nutrients and the transfer of hazardous elements such as heavy metals during the cycle, endanger the growth of crops, thereby decreasing food production and adversely affecting human health through the food chains. The mechanism of heavy metal-polluted soil under the recycling mode of direct straw manuring is analysed to determine its distribution characteristics. The concentration distribution characteristics of heavy metals such as Pb, Cr, Cd and As in the soil are identified through experiments. Empirical study shows that the contents of the four heavy metals in the soil of the wheat-maize rotating farmland under direct straw manuring mode do not exceed the values listed in the Environmental Quality Standards for Soils (GB15618-1995). The contents of Cr and Cd in the ischolar_mains of wheat and maize are significantly higher than those in the soil, suggesting the accumulation of these metals in the ischolar_mains, while those of Pb and As do not have this phenomenon. The contents of the heavy metals in the ischolar_mains, stems, leaves and seeds of the crops decrease in order. The pollution of the heavy metals including Pb, Cr, Cd, As under the direct straw manuring is explored, and their migration rules in the farmland ecosystem are systematically explored. The results provide a basis for regulating and blocking heavy metals, preventing heavy metal pollution and safeguarding food safety.

Keywords

Direct Straw Manuring, Heavy Metal Pollution in Soil, Distribution Characteristics.

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