Figure 1.
Concentration (µg PLFA·g−1 SOM) in top soil of PLFAs.
Sum of all bacterial and fungal PLFA biomarkers (A); the fungal PLFA biomarker 18:2ω6,9 (B); all gram positive biomarkers (C) and all bacteria PLFA biomarkers (D); one day after addition of glycine to field plots subjected to in situ treatment through one year with the climate change factors: elevated atmospheric CO2 concentration (CO2), summer drought (D) and warming (T), and those treatments in all combinations. A is ambient control = no treatment. Error bars represent standard error. Significant effects of treatments: * is P<0.05.
Table 1.
Significant effect of climate change treatments (P-values) on PLFA 13C enrichment from soils from the CLIMAITE experiment sampled in August 2007.
Figure 2.
13C-CO2 enrichment in soil air (atom %).
A time-series beginning a few hours prior to addition of the 13C-enriched glycine label till 168 hours after addition fit a log-normal curve: 13C-CO2 = 1.108+1.359*exp(−0.5*(ln(T/3.269)/1.797)2)/T); (R2 = 0.8832). Curve indicates average, 95% Confidence Band and 95% Prediction Band.
Figure 3.
13C enrichment (atom%) in individual PLFAs.
Gram positive biomarker i17:0 (A), the non-specific PLFA 16:0 (B), the non-specific 18:0 (C) and the fungi biomarker PLFA 18:2ω6,9 (D) one day after addition of 13C2-glycine to field plots subjected to in situ treatment through one year with the climate change factors: elevated atmospheric CO2 concentration (CO2), summer drought (D) and warming (T), and those treatments in all combinations. A is ambient control = no treatment. Error bars represent standard error. Significant effects of treatments: * is P<0.05.