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| Remediation Effects of Urban Greening-Tree Litters on Petroleum-Contaminated Soil in Oil Producing Region of Northern Shaanxi |
| Received:July 18, 2014 |
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| KeyWord:petroleum-contaminated soil;urban greening tree;leaf litter |
| Author Name | Affiliation | E-mail | | YU Qi | College of Forestry, Northwest A&F University, Yangling 712100, China | | | ZHANG Xiao-xi | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | LIU Zeng-wen | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | zengwenliu2003@aliyun.com | | WANG Wen-xuan | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHANG Zhen-yao | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | WANG Ning | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| Soil contamination by petroleum has become a serious environmental issue in oil-producing areas. Research has showed that organic residue additions could enhance the degradation of petroleum in soils. In a laboratory experiment, the effects of litters from 19 urban greening tree species on chemical and biological properties of petroleum-contaminated soil were evaluated. A petroleum contaminated soil was collected in Northern Shaanxi and incubated with the litters for 120 d. Additions of all foliar litters significantly increased the contents of organic matters, available K and available Zn in the contaminated soil. Most of litters significantly increased the contents of alkaline-soluble N and available Mn and Fe, and enhanced the activities of catalase, sucrose, phosphatase, dehydrogenase, urease and protease. Applying the litters also promoted the growth of fungi and actinomycetes. However, litter applications generally decreased soil pH values but did not increase available P and Cu contents. In the tested 19 litters, only several litters improved bacterial population and polyphenol oxidase activity. Except Acer mono, all tree litters accelerated petroleum degradation. Such effect was in order of Melia azedarach > Prunus persica > Morus alba > Sophora japonica > Salix babylonica > Acermono Maxim > Prunus cerasifera. The litters from the rest species had negligible or even negative effects on petroleum degradation. |
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