Figure 5. Incorporation of ¹³C from glucose, glycine, acetic acid, starch and vanillin into the individual NLFAs (a) 18∶2ω6,9 and (b) 18∶1ω9.

Tundra heath soils from a field experiment with long-term warming and fertilization treatments were incubated 1 and 7 days.The bars represent mean+SE. Note different y-axis scales. Significant effects of factors warming (W), fertilizer addition (F), time (T) and their interactions for each substrate are shown at **P<0.01, ***P<0.001 (Linear Mixed Models with Warming, Fertilization and Time as fixed factors and Block as a random factor).