|
| Impact and risk assessment of agricultural mechanization operations on the distribution characteristics of PAHs in farmland soils in the Sanjiang Plain |
| Received:January 06, 2025 |
| View Full Text View/Add Comment Download reader |
| KeyWord:agricultural mechanized operations;farmland soil;PAHs;ecological risk assessment;the Sanjiang Plain |
| Author Name | Affiliation | E-mail | | BIAN Wenru | College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China | | | WANG Donghong | Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100049, China | dhwang@rcees.ac.cn | | DU Chuan | Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU Quanzhen | Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China | | | XIE Yongchang | Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIN Lihua | Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Beijing 100085, China | | | LIANG Wenyan | College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China | lwy@bjfu.edu.cn |
|
| Hits: 251 |
| Download times: 236 |
| Abstract: |
| In order to explore the residues of polycyclic aromatic hydrocarbons（PAHs）in farmland as a result of agricultural mechanization activities, soil sample collection was carried out in soils during the growing and maturing periods of crops in the Sanjiang Plain of China in 2022—2023, and accelerated solvent extraction（ASE）-gas chromatography-mass spectrometry（GC-MS）was applied to analyze the 16 priority control PAHs. The results showed that the concentration of Σ16PAHs during the crop maturity period in farmland soil was higher than that of the crop growth period, with an average value of 218.26 μg·kg-1. But compared with other domestic commercial grain planting bases, the concentration is at a lower level. According to the planting scale, the average Σ16PAHs in the large-scale cultivation area was higher than that in the small-scale cultivation area during the maturity period. The analysis by the isomerism ratio method showed that PAHs in the soil of large-scale cultivation area in the maturity period mainly originated from coal, biomass combustion and petroleum sources, while PAHs in the soil of small-scale cultivation area mainly originated from coal and biomass combustion, which further indicated that the source of PAHs in the soil of the farmland may be related to the mechanized operation of the agriculture. The average Σ16PAHs concentration in the soil of Youyi farm was lower than that of Xingkaihu farm at maturity, which may be due to the difference in mechanization level of different farms. According to the Soil environmental quality Risk control standard for soil contamination of agricultural land（GB 15618—2018）, the risk assessment of benzo[a]pyrene（BaP）was carried out in different cultivated areas, and BaP did not reach the risk screening value in the large-scale and small-scale cultivation areas, which indicated that the risk of soil pollution on farmland in the study area was low. Meanwhile, the low and medium values of the effect intervals method was applied to assess the ecological risk of PAHs in farmland soils of different cultivated areas during the mature period. PAHs in farmland soil have not yet caused significant negative impacts on the environment, but there are differences in the ecological risk values of PAHs in farmland soil at different cultivation scales. However, the ecological risk values of Flu and Phe in farmland soil in large-scale cultivation areas have reached 35.42% and 16.56% of the effects range low value, respectively, which are 10.43 and 7.44 percentage points higher than those in small-scale cultivation areas. Agricultural mechanization operations have an impact on the pollution level and distribution characteristics of PAHs in the farmland soil of the Sanjiang Plain, suggesting that further attention should be paid to the PAHs pollution in large-scale agricultural mechanization soil. |
|
|
|
