Table 1.
Concentrations of total carbon (TC), total nitrogen (TN), microbial biomass carbon (MBC) and nitrogen (MBN) and root biomass in 0–10 cm soil depth under different treatments.
Fig 1.
Effects of incubation temperature (A) and incubation day (B) on soil respiration. Mean ±se is shown in the figures. Different letters and * indicate significant difference at 0.05 level.
Fig 2.
Dynamics of soil respiration over the incubation period under different treatments.
(A) Combination of incubation temperature and soil moisture. (B) combination of original warming treatment and incubation temperature. T1M1: 5°C with 30% water holding capacity (WHC); T1M2: 5°C with 60% WHC; T2M1: 15°C with 30% WHC; T2M2: 15°C with 60% WHC; T3M1: 25°C with 30% WHC; and T3M2: 25°C with 60% WHC. NWT1: no-warming with 5°C incubation; NWT2: no-warming with 15°C incubation; NWT3: no-warming with 25°C incubation; WT1: warming with 5°C incubation; WT2: warming with 15°C incubation; WT3: warming with 25°C incubation; Mean±se in the figures. Different letters indicate significant difference at 0.05 level.
Table 2.
Summary of repeated-measure ANOVAs for soil respiration using original treatments, soil temperature and soil moisture incubated as main factors.
Fig 3.
Relationships between soil respiration and root biomass under different treatments.
T1M1: 5°C with 30% water holding capacity (WHC); T1M2: 5°C with 60% WHC; T2M1: 15°C with 30% WHC; T2M2: 15°C with 60% WHC; T3M1: 25°C with 30% WHC; and T3M2: 25°C with 60% WHC.
Fig 4.
Difference in soil respiration (μg CO2 g-1 soil h-1) before and after 4h of glucose addition under different incubation temperatures (A) and soil moistures (B), carbon availability index (CAI) (C) under different incubation temperatures. Fig A and C show the mean values of 30 and 60% water holding capacity treatments under 5, 15 and 25°C incubation temperatures, and Fig B shows the mean values at 5, 15 and 25°C incubation temperature of the 30 and 60% water holding capacity treatments. Mean ±se is shown in the figures. Different letters indicate significant difference at 0.05 level.
Fig 5.
Temperature sensitivity (Q10) of soil respiration under different original field treatments.
C: no-warming with no-grazing; G: no-warming with grazing; W: warming without grazing; WG: warming with grazing. Mean ±se is shown in the figures. Different letters indicate significant difference at 0.05 level.