Scientists find inorganic N addition decreasing soil microbial respiration but increasing its averaged Q10 in a temperate forest
Fig. 1 Cumulative respired C after 150-day incubation at 15 oC and 25 oC in a temperate forest. CT, IN, ON and MN represent control, inorganic N, organic N and their mixture treatments, respectively. The different letters above the bars represented significant differences among treatments at the same temperature (P < 0.05).
Fig. 2 The temporal variations of Q10 under different types of N deposition during 150 day incubation in a temperate forest. CT, IN, ON and MN represent control, inorganic N, organic N and their mixture treatments, respectively (Image by WANG Qingkui).
Fig. 3 Contributions of main controlling factors to explaining variations in soil cumulative respired C at 15 oC and 25 oC and its temperature sensitivity (Q10) based on redundancy analysis. NO3 and NH4 present nitrate and ammonium nitrogen; AP presents soil available P; C:N presents the ratio of soil organic C to total N; B:F denotes the ratio of bacterial PLFAs: fungal PLFAs; GP and GN denote gram-positive and –negative bacterial PLFAs, respectively. Cyc:mono, Sat:mono denote ratios of cyclopropyl to monoenoic fatty acids and total saturated to total monounsaturated fatty acids (Image by WANG Qingkui).
Publication Name: WANG Qingkui et al.