School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi Province, China.
Chemosphere. 2013 Apr;91(4):491-7. doi: 10.1016/j.chemosphere.2012.12.009. Epub 2013 Jan 3.
In this study, a greenhouse experiment was conducted to investigate interactive effects of cadmium (Cd) × pyrene × plant treatments on soil microbial activity and community structure. The results demonstrated that the basal respiration, microbial biomass carbon and metabolic quotient in both unplanted and rhizosphere soil were significantly influenced by interaction of Cd and pyrene. The combined application of Cd and pyrene caused a significantly greater biocidal influence on the soil microorganisms than the single spiking of Cd or pyrene. The soil basal respiration increased with the spiking of 2.5 mg kg(-1) Cd in both unplanted and rhizosphere soil. The eco-physiological index of Cd-tolerant populations was significantly different among the unplanted soil, rhizoplane and rhizosphere soil of tall fescue, indicating a slightly uneven distribution of fast- and slow-growing tolerant bacteria. Obvious differences in microbial activity were observed among treatments due to different physicochemical characteristics of the rhizosphere soils depending on the plant species.
本研究通过温室实验，研究了镉（Cd）×芘×植物处理对土壤微生物活性和群落结构的交互影响。结果表明，在非根际和根际土壤中，Cd 和芘的相互作用显著影响基础呼吸、微生物生物量碳和代谢商。与单独添加 Cd 或芘相比，Cd 和芘的联合应用对土壤微生物具有更大的杀菌作用。在非根际和根际土壤中，添加 2.5mg/kg Cd 可显著增加土壤基础呼吸。高羊茅非根际土壤、根面和根际土壤中耐 Cd 种群的生态生理指数存在显著差异，表明快速生长和慢速生长的耐细菌分布不均。由于不同植物根际土壤的物理化学特性不同，不同处理之间的微生物活性存在明显差异。
