Table 1.

Indicator families for soil bacterial and fungal communities across the six successional stages during a secondary forest succession on the Loess Plateau.

Successional stage	Vegetation type	Indicator family (bacteria)	Indicator value	P
S1	Annual herb	Nitrosomonadaceae	0.39	0.05
		Cytophagaceae	0.30	0.01
S2	Perennial Artemisia	–	–	–
S3	Perennial grass	Aurantimonadaceae	0.56	0.01
		Williamsiaceae	0.45	0.01
		Verrucomicrobiaceae	0.36	0.02
		Intrasporangiaceae	0.31	0.03
		Caldilineaceae	0.26	0.01
S4	Shrub	Tsukamurellaceae	0.48	0.04
		Streptomycetaceae	0.30	0.03
		Pseudonocardiaceae	0.28	0.04
S5	Pioneer forest	Alcaligenaceae	0.30	0.05
		Syntrophobacteraceae	0.27	0.01
		Entotheonellaceae	0.27	0.03
S6	Climax forest	Acidobacteriaceae	0.63	0.01
		Hyphomonadaceae	0.44	0.03
		Leptospirillaceae	0.44	0.01
		Hyphomicrobiaceae	0.27	0.01
		Planctomycetaceae	0.24	0.04
		Indicator family (fungi)
S1	Annual herb	Spizellomycetaceae	0.62	0.04
S2	Perennial Artemisia	Septobasidiaceae	0.66	0.00
S3	Perennial grass	Halosphaeriaceae	0.91	0.05
		Leptosphaeriaceae	0.75	0.01
		Chaetothyriaceae	0.63	0.00
		Montagnulaceae	0.61	0.01
		Ceratobasidiaceae	0.50	0.04
		Tremellaceae	0.44	0.01
		Mycosphaerellaceae	0.42	0.03
S4	Shrub	Thelephoraceae	0.54	0.02
S5	Pioneer forest	Mycenaceae	0.61	0.03
S6	Climax forest	Stictidaceae	0.68	0.02