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| 典型煤炭资源型地区PAHs在根际土壤-玉米体系的迁移分配格局 |
| Transport and distribution patterns of PAHs in the rhizosphere soil-maize system of a typical coal-based region |
| 投稿时间：2025-01-06 |
| DOI：10.13254/j.jare.2025.0016 |
| 中文关键词: 资源型地区，多环芳烃，土壤-玉米，污染特征，迁移分配 |
| 英文关键词: resource-based region, polycyclic aromatic hydrocarbon, soil-maize, pollution characteristic, transport pattern |
| 基金项目:国家自然科学基金项目（42107420，U23A20157）；山西省应用基础研究计划项目（20210302124363） |
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| 摘要点击次数: 321 |
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| 中文摘要: |
| 资源型地区的高能耗产业导致多环芳烃（PAHs）的大量排放，对农田生态系统造成严重污染，威胁粮食安全和人体健康。本研究以山西省典型煤炭资源型地区大同、太原及晋城为研究区，采集玉米苗期、穗期、成熟期的根际土壤、植物样品，深入探究了PAHs在土壤-玉米体系的累积特征及迁移分配规律。结果表明：研究区玉米根际土壤∑16PAHs的平均含量为648.76 ng·g-1，呈中-重度污染水平。玉米根际土壤和植株的∑16PAHs含量均呈现出较强的区域和时期差异，且低环PAHs占据主导地位。三个城市的根际土壤∑16PAHs均值呈大同（1 091.29 ng·g-1）>太原（707.64 ng·g-1）>晋城（147.35 ng·g-1）的趋势；大同根际土壤中∑16PAHs含量随玉米生长呈递减趋势，而太原和晋城呈递增趋势，且在苗期和穗期大同∑16PAHs含量显著高于晋城（P<0.05）。苗期、穗期和成熟期玉米植株对PAHs的富集均表现为根>茎叶>籽粒，且三个城市玉米根中∑16PAHs含量的最高值出现的时期不同；大同苗期玉米茎叶中∑16PAHs含量显著高于太原和晋城（P<0.05），且茎叶中∑16PAHs含量随玉米生长呈递减趋势，其余两个城市表现为先增后减。穗期和成熟期晋城玉米对中、高环PAHs的富集系数显著高于其余两个城市（P<0.05）。低环PAHs因低疏水性（logKow<4.5）而优先被根系吸收，其中萘（NAP）的富集能力最强。4环PAHs更易在茎叶中转运（TFsl达0.13），5、6环PAHs被根系吸收后向上迁移过程受到限制（TFg<0.01）。本研究结果可为典型煤炭资源型地区PAHs在土壤-玉米体系的迁移风险提供数据支撑。 |
| 英文摘要: |
| The high-energy-consuming industries in resource-based regions have led to substantial emissions of polycyclic aromatic hydrocarbons（PAHs）, causing severe contamination to farmland ecosystems and posing threats to food safety and human health. This study focused on typical coal-based cities of Datong, Taiyuan, and Jincheng in Shanxi Province. Rhizosphere soil and maize samples were collected during the seedling, tasseling, and maturity stages to comprehensively investigate the accumulation characteristics and transport patterns of PAHs in the soil-maize system. The results showed that the average content of ∑16PAHs in the rhizosphere soils of the study area was 648.76 ng·g-1, indicating moderate to heavy pollution levels. Both rhizosphere soil and maize plants exhibited strong regional and temporal variations in ∑16PAHs contents, with low-ring PAHs dominating. Among the three cities, the mean ∑16PAHs contents of rhizosphere soil followed the order：Datong（1 091.29 ng·g-1）> Taiyuan（707.64 ng·g-1）> Jincheng（147.35 ng·g-1）. In Datong, ∑16PAHs in rhizosphere soil decreased during maize growth, while an increasing trend was found in Taiyuan and Jincheng. During the seedling and tasseling stages, rhizosphere soil ∑16PAHs contents in Datong were significantly higher than those in Jincheng（P<0.05）. During the seedling, tasseling, and maturity stages, the enrichment of PAHs in maize consistently followed the order：root>stem and leave>grain, with the peak ∑16PAHs contents in roots occurring at different growth stages across the three cities. The content of ∑16PAHs in the stems and leaves of seedlings in Datong City was significantly higher than that in Taiyuan and Jincheng（P<0.05）, and the content of ∑16PAHs in stems and leaves decreased progressively during maize growth, whereas in the other two cities, the content showed exhibited an initial increase followed by a decrease. Maize in Jincheng exhibited significantly higher bioaccumulation factors for medium-and high-ring PAHs during tasseling and maturity compared to the other two cities（P<0.05）. Low-ring PAHs, due to their low hydrophobicity（logKow<4.5）were preferentially absorbed by roots, with naphthalene（NAP）demonstrating the strongest enrichment capacity. Four-ring PAHs were more readily transported to stems and leaves（TFsl up to 0.13）, while five- and six-ring PAHs were largely restricted after root uptake（TFg< 0.01）. The findings of this study provide critical data for assessing the transport risks of PAHs in the soil-maize system in typical coalbased regions. |
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