外源添加作物秸秆对PAHs污染土壤有机碳矿化和污染物降解的影响
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X53

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国家自然科学基金项目(42107441,21972073)、宜昌市森林抚育效益监测项目(SDHZ2020313)和111引智项目(D20015)资助。


Effect of Straw Addition on Organic Carbon Mineralization and Pollutant Degradation in PAHs Contaminated Soil
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    本文通过土壤腐解试验研究外源添加水稻或玉米秸秆对多环芳烃(PAHs)污染土壤CO2-C释放和污染物去除率的影响,同时清晰秸秆腐解中间产物溶解性有机碳(DOC)与土壤PAHs降解的关系。结果表明:秸秆添加处理促进了PAHs污染土壤CO2-C的释放,以玉米秸秆提升效果较好。外源添加秸秆显著增加了土壤DOC含量,且增加幅度随秸秆添加量的增加而增大;水稻秸秆对土壤DOC含量的提升幅度较大。与对照相比,秸秆添加处理下土壤菲、芘残留量均显著降低,菲、芘去除率显著增加,去除效果:玉米>水稻,高量>低量,菲>芘;与对照相比,添加高量玉米秸秆处理(PY15)对土壤菲、芘去除率的增加幅度分别为91.7%和182%。此外,在一定范围内土壤DOC含量与PAHs去除率呈正相关关系。可见,农作物秸秆,尤其是玉米秸秆添加可提升PAHs污染土壤有机碳矿化,亦可在提升土壤DOC含量的同时促进污染土壤PAHs的降解。

    Abstract:

    A soil incubation experiment was conducted to investigate the effect of corn or rice straw addition on CO2-C release and pollutant removal in polycyclic aromatic hydrocarbons (PAHs) contaminated soil, and examine the relationship between soil dissolved organic carbon (DOC) and PAHs degradation. The results show that the release of CO2-C is increased by straw added treatment in PAHs polluted soil, and the effect of corn straws is better. Soil DOC concentration is significantly increased by straw supplement, and the increase amplitude is further improved by the increasing level. Compared to corn straws, rice straws cause the higher level of soil DOC. Meanwhile, soil residual PAHs concentrations are significantly decreased by straw added treatments compared with CK, and the removal rate of pollutants is correspondingly increased. The removal efficiency follows as:corn straw better than rice straw, high addition rate better than low level, phenanthrene better than pyrene. Compared to CK, the removal rate of phenanthrene and pyreneare respectively increased by 91.7% and 182% with high level of corn straw addition. In addition, soil DOC concentration is positively correlated with the removal rate of PAHs in a certain range. Consequently, high addition amount of corn straws can promote soil organic carbon mineralization, increase soil DOC concentration and the degradation of PAHs in PAHs polluted soils.

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李力,陈明茹,张久红,张军,黄应平,袁喜,李萌.外源添加作物秸秆对PAHs污染土壤有机碳矿化和污染物降解的影响[J].土壤,2022,54(5):1058-1063. LI Li, CHEN Mingru, ZHANG Jiuhong, ZHANG Jun, HUANG Yingping, YUAN Xi, LI Meng. Effect of Straw Addition on Organic Carbon Mineralization and Pollutant Degradation in PAHs Contaminated Soil[J]. Soils,2022,54(5):1058-1063

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  • 收稿日期:2021-12-06
  • 最后修改日期:2022-06-15
  • 录用日期:2022-06-17
  • 在线发布日期: 2022-10-31
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