Table 3. Proportion of fresh organic matter (FOM) derived C to total C and ¹³C distribution among selected phospholipid fatty acid (PLFA) groups in FOM treated soils on 0 d, 20 d, and 105 d of the incubation.

	Larch Plantation soil					Secondary Forest soil
	G+	G-	Bacteria	Fungi	Actinomycetes	G+		G-		Bacteria		Fungi		Actinomycetes
Proportion of FOM-derived C to total C in PLFAs (%)
20d
+leaves	5.37a	4.96a	5.22a	9.66b	1.80b	9.67a		10.70a		10.03a		15.69a		5.87a
+stalks	4.78b	4.77a	4.78b	10.40a	2.55a	7.68b		9.70b		8.39b		16.32a		6.82a
105d
+leaves	4.49a	3.81a	4.27a	6.62a	4.08a		9.17a		9.02a		9.12a		12.13a		7.66b
+stalks	4.27a	3.74a	4.09a	7.64a	4.96a		9.40a		9.18a		9.33a		12.38a		9.27a
13C distribution among PLFA groups (%)*
20d
+leaves	25.39a	12.67b	38.06a	26.96b	2.29b		25.12a		15.09a		40.20a		26.19b		3.91b
+stalks	23.94a	13.84a	37.78a	30.97a	3.35a		22.69b		15.66a		38.36b		30.26a		4.86a
105d
+leaves	29.64a	12.06a	41.70a	22.63b	6.51a		30.36a		14.68a		45.05a		21.78a		6.39b
+stalks	27.18b	12.34a	39.52a	26.20a	8.57a		30.61a		14.73a		45.34a		22.22a		8.12a

Letters in the same column for each sampling time denote significant differences (P < 0.05) between FOM treatments (n = 4). Note: The proportion of FOM-derived C to total C in each microbial group (e.g. bacteria, fungi) was calculated as: ; ¹³C distribution proportion in each microbial group (e.g. bacteria, fungi) was calculated as: ; where P_i and A_i are the proportion of FOM-derived C to total C and the abundance of each PLFA for a special microbial group (e.g. bacteria, fungi), respectively; while P_j and A_j (j = 1, 2∙∙∙∙∙∙16) are those for all 16 PLFAs detected.

^*As the results of common saturated PLFAs (16:0, 18:0), which were not assigned to a taxonomic group (bacteria, fungi or actinomycetes), were not shown, the sum of these % was less than 100%.