Fig. 11From: Soil pH is the primary factor driving the distribution and function of microorganisms in farmland soils in northeastern ChinaThe correlation analysis between environmental factors and ecological functions of bacteria. The numbers display the Pearson’s correlation coefficient (r). Blue and red indicate positive and negative correlation, respectively. The color density and numbers reflect the scale of correlation. *Significant level (*P < 0.05; **P < 0.01; ***P < 0.001)Back to article page