Fig. 2From: Effect of nitrogen addition on the carbon metabolism of soil microorganisms in a Calamagrostis angustifolia wetland of the Sanjiang Plain, northeastern ChinaUtilization of different carbon sources by soil microbial communities under different nitrogen addition concentrations. 1 Carbohydrate, 2 amino acids, 3 alcohols, 4 esters, 5 amine, 6 acids; lowercase letters indicate significant differences (P < 0.05). CK, control; N40, 40 kg N ha−1 a−1; N80, 80 kg N ha−1 a−1Back to article page