Figure 3. Shannon’s diversity index of soil bacteria community of organic management (OM) and conventional management (CM) in summer and winter of 2013 and 2014 respectively.

Data are means ± standard error. “S” and “W” in the sample codes mean summer at mid-June and winter at mid-December respectively. * indicates the significant difference between managements at P < 0.05 level (Student’s t-test).