Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (4): 859-869.DOI: 10.3969/j.issn.1004-1524.20230377

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Effects of mixed addition of greenery wastes from Styphnolobium japonicum and other plants on remediation effects on petroleum-polluted soil

LIU Chong(), WANG Yiren, ZHOU Wenxing, ZHANG Xiaoxi()   

  1. School of Life Sciences, Yan’an University, Yan’an 716000, Shaanxi, China
  • Received:2023-03-22 Online:2024-04-25 Published:2024-04-29
  • Contact: ZHANG Xiaoxi

Abstract:

Based on the indoor simulated experiment, the remediation effects of mixed addition of greenery wastes from Styphnolobium japonicum with Platycladus orientalis, Picea asperata, Pinus tabuliformis, Acer truncatum, and Juniperus formosana, commonly used trees in urban landscaping in a mass ratio of 1∶1, respectively, on petroleum polluted soil were investigated, to provide scientific basis for the reasonable utilization of greenery waste in petroleum-polluted soil remediation. It was shown that the mixed application of S. japonicum waste with P. orientalis, P. asperata, A. truncatum, or J. formosana waste could significantly (P<0.05) strengthen the efficiency of greenery waste in removing petroleum pollutants (at least the removal of saturated hydrocarbons). Meanwhile, it could enhance the stimulating effects on soil urease, alkaline phosphatase and dehydrogenase activities. However, the mixed additions hindered the replenishing of soil available nitrogen and phosphorus. The mixed addition of S. japonicum and P. tabuliformiswastes negatively affected the remediation efficiency both in pollutants removal and soil chemical and biological properties recovery. Mixed greenery wastes with higher contents of nitrogen, phosphorus, amino acids and organic acids exhibited higher efficiency in degrading petroleum pollutants, the wastes with higher contents of nitrogen, phosphorus, amino acid also exhibited higher efficiency in increasing the soil available nitrogen (mainly ammonium nitrogen) content and urease and dehydrogenase activities, while those with higher phenolics content exhibited more favorable effects in increasing soil invertase, alkaline phosphatase and catalase activities. However, mixed greenery wastes with high internal chemical dispersion and terpenoids contents tended to weaken the ability of removing saturated hydrocarbons and increasing soil urease and catalase activities. In conclusion, adding greenery wastes in a suitable mixing form could strengthen the remediating effects on petroleum contaminated soil.

Key words: greenery waste, mixed decomposition, non-additive effect, soil petroleum pollution

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