JIA-2019-11

2610 CHEN Xu et al. Journal of Integrative Agriculture 2019, 18(11): 2605–2618 abundance fromGLwas 3 times higher than BF and FL soils at the end of incubation. The addition of the substrates did not significantly affect all PLFA abundance in GL during the incubation relative to CK, but PLFA abundance was significantly higher with substrate addition in FL and BF, except for inorganic-N addition. The application of glucose or alanine increased PLFA abundance throughout the incubation, mainly for FL 0 10 20 30 40 50 60 0 5 10 15 20 25 30 0 10 20 30 40 50 60 0 50 100 150 200 250 300 0 10 20 30 40 50 60 0 5 10 15 20 25 30 0 10 20 30 40 50 60 0 50 100 150 200 250 300 0 10 20 30 40 50 60 0 5 10 15 20 25 30 0 10 20 30 40 50 60 0 50 100 150 200 250 300 0 10 20 30 40 50 60 0 5 10 15 20 25 30 0 10 20 30 40 50 60 0 50 100 150 200 250 300 NS NS NS NS NS NS NS * * * NS * GL-IAD GL-RAD FL-IAD FL-RAD BF-IAD BF-RAD CK * NS NS NS NS NS NS NS * * * * CK NS NS NS NS NS NS NS NS * * * * Inorganic N Fungal PLFA (nmol g –1 ) * NS NS NS NS NS NS NS * * * * Inorganic N Bacterial PLFA (nmol g –1 ) NS NS NS NS NS NS NS NS * * * * Glucose NS NS NS NS NS NS NS NS * * * * Glucose NS NS NS NS NS NS NS NS NS * * * Alanine Incubation time (day) NS NS NS NS NS NS NS NS NS * * * Alanine Incubation time (day) Fig. 2 Dynamics of fungal and bacterial phospholipid fatty acid abundances during the incubation. Treatments included intact aggregate distribution (IAD) and reduced aggregate distribution (RAD) for grassland (GL), farmland (FL) and bare fallow (BF). The asterisks and NS indicate significant ( P <0.05) and non-significant ( P >0.05) differences between IAD and RAD, respectively. Means ( n =3) and standard errors are shown.