Effects of mixed addition of greenery wastes from Styphnolobium japonicum and other plants on remediation effects on petroleum-polluted soil
Based on the indoor simulated experiment,the remediation effects of mixed addition of greenery wastes from Styphnolobium japoncum with Platycladus orientalis,Picea asperata,Pinus tabuliformis,Acer truncatum,and J uniper us 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.aspe-rata,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.tabu-liformis wastes negatively affected the remediation efficiency both in pollutants removal and soil chemical and biologi-cal 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,phos-phorus,amino acid also exhibited higher efficiency in increasing the soil available nitrogen(mainly ammonium nitro-gen)content and urease and dehydrogenase activities,while those with higher phenolics content exhibited more fa-vorable 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 satu-rated hydrocarbons and increasing soil urease and catalase activities.In conclusion,adding greenery wastes in a suit-able mixing form could strengthen the remediating effects on petroleum contaminated soil.
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