Figure 1.
Effects of warming and increased precipitation on soil total C and N (TC, TN) (a), light fraction C and N (LFC, LFN) (b), heavy fraction C and N (HFC, HFN) (c), LFC∶HFC ratio and LFN∶HFN ratio (d) (means ± SE).
C, control; W, warming; P, increased precipitation; WP, warming plus increased precipitation.
Table 1.
Results (F and p values) of three-way ANOVA on the effects of block (B), warming (W), increased precipitation (P) and their interaction on measured soil variables.
Figure 2.
Effects of warming and increased precipitation on ratios of soil C∶N (TC∶TN), light fraction C∶N (LFC∶LFN) and heavy fraction C∶N (HFC∶HFN) (mean ± SE).
See Fig. 1 for abbreviations.
Table 2.
Results (F and p values) of three-way ANOVA on the effects of block (B), warming (W), increased precipitation (P) and their interaction on soil C∶N ratios, MBC, MBN and DOC.
Figure 3.
Effects of warming and increased precipitation on soil microbial biomass C and N (MBC, MBN) and soil dissolved organic C (DOC) (means ± SE).
See Fig. 1 for abbreviations.
Figure 4.
Linear correlations between GEP and light fraction C (a) or N (b), MBC (c) and DOC (d) across all the 24 subplots.
GEP, gross ecosystem productivity, whose values were the yearly mean values from 2005 to 2009.
Figure 5.
Linear correlations between carbon flux (ER or SR) and light fraction C (a, b) or N (c, d) across all the 24 subplots.
ER, ecosystem respiration; SR, soil respiration. The values of ER and SR were the yearly mean values from 2005 to 2009.
Figure 6.
Linear correlations between carbon flux (ER or SR) and MBC (a, b) or DOC (c, d) across all the 24 subplots.
ER, ecosystem respiration; SR, soil respiration; MBC, microbial biomass C; DOC, soil dissolved organic C. The values of ER and SR were the yearly mean values from 2005 to 2009.