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International Biodeterioration & Biodegradation
Vol. 114, 2016, Pages: 228–233

Removal of pyrene in simulated wetland by joint application of Kyllinga brevifolia Rottb. and immobilized microbes

Chuanhua Wang, Lingfeng Gu, Xiaoyan Liu, Shimei Ge, Tingru Chen, Xiaoxin Hu

College of Environment and Chemical Engineering, Shanghai University, Shanghai 200444, China.


The objectives of this study were to evaluate the effects of plant and immobilized microbes on pyrene removal and soil microbial functional diversity of co-contaminated soil. The results indicated that the dissipation ratios of pyrene in the soil with plant (P), soil with immobilized microbes (IM) and soil with both of them (PIM) were 51.5 ± 0.69%, 55.2 ± 3.8%, 63.2 ± 1.29% respectively, and were higher than CK (31.2 ± 1.5%) with neither of them. Soil microbial functional diversity was assessed by the community-level physiological profiles (CLPP) using Biolog Eco-plates. The Biolog results revealed that the metabolic intensity in the rhizospheric soil marked P-R and PIM-R was significantly higher than that of non-rhizospheric soil and the CK during the incubation period. A similar variation in the diversity indexes (Shannon, Simpson and McIntosh) was observed. Principal component analysis (PCA) of the distribution of carbon substrate utilization for all treatments suggests that the microbial community catabolic diversity is different. Among the carbon utilization profile, carbohydrates were the main carbon source of the sample soil and IM increased the potential utilization of two substrate groups (phenols and carbohydrates) more strongly than that of the other groups.

Keywords: Kyllinga brevifolia Rottb. (KBR); Immobilized microbes; Pyrene; Microbial functional diversity; Biolog Eco-plates.

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