Notice of RetractionResponses of soil microbial to long-term elevated CO2 in Pinus sylvestriformis and Pinus koraiensis Seedlings Fields

Responses of soil microbial to elevated CO<sub>2</sub> in Pinus sylvestriformis and Pinus koraiensis Seedlings Fields in summer were investigated. The results indicated bacterial numbers increased significantly (p ≤ 0.05) at elevated CO<sub>2</sub> for Pinus sylvestriformis, and it decreased significantly (p ≤0.05) with CO<sub>2</sub> enrichment for Pinus koraiensis. As such, the size of soil microbial biomass C also decreased significantly at 700 μmol/mol CO<sub>2</sub>. Bacterial community structure changed evidently under elevated CO<sub>2</sub> compared to ambient through DGGE (Denaturing Gradient Gel Electrophoresis) analysis of bacterial 16S rDNA gene fragments amplified by PCR from DNA extracted directly from soil. Our result also suggested that response of microbial to CO<sub>2</sub> enrichment was relate to plant species exposed to elevated CO<sub>2</sub>.

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