农业环境科学学报2025，Vol.44Issue(3)：685-695,11.DOI:10.11654/jaes.2025-0012
农业机械化作业对三江平原农田土壤PAHs分布特征的影响及风险评价
Impact and risk assessment of agricultural mechanization operations on the distribution characteristics of PAHs in farmland soils in the Sanjiang Plain
摘要
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 218.26µg·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.关键词
农业机械化作业/农田土壤/多环芳烃/生态风险评价/三江平原Key words
agricultural mechanized operations/farmland soil/PAHs/ecological risk assessment/the Sanjiang Plain分类
资源环境引用本文复制引用
卞雯茹,王东红,杜川,刘权震,谢咏昌,林利华,梁文艳..农业机械化作业对三江平原农田土壤PAHs分布特征的影响及风险评价[J].农业环境科学学报,2025,44(3):685-695,11.基金项目
中国科学院先导A类专项(XDA28100503) （XDA28100503）
国家自然科学基金项目(22406193,51672028) Strategic Priority Research Program of the Chinese Academy of Sciences(XDA28100503) （22406193,51672028）
National Natural Science Foundation of China(22406193,51672028) （22406193,51672028）
