. 2013 Nov 25;3(16):5177–5188. doi: 10.1002/ece3.895

Table 1.

Total soil C respiration (i.e., soil CO₂-C efflux in μmol/m²/s) on the last date before sampling (7th September) or sum of the eight different measurements made over the growing season (i.e., SUM = sum of effluxes measured at each sampling dates: 28th May, 16th June, 6th July, 28th July, 17th August, 7th September, 30th September and 19th October), soil organic C and N (μg/g soil), C:N ratio, and C mineralization rates measured during the 10-day incubation period at 15°C (μg/g organic C) in the control-irrigated (I), warmed-control-irrigated (WI), fertilized-irrigated (FI), and combined warmed and fertilized-irrigated (WFI) treatments and for the two soil horizons, respectively (average and standard deviation; n = 2 field replicates × 3 subsamples = 6 samples; excepted for the C content in the O horizon of the FI treatment where there was significant difference between field replicates, then both field replicate values are presented and n = 3 samples)

	Soil field measurements		Soil laboratory measurements

	CO₂-C efflux (R)		O horizon				E horizon

Treatments	7th September	SUM	C	N	C:N	CO₂-C	C	N	C:N	CO₂-C
I	3.3 (0.3)^a	23.3 (2.9)^a	15.9 (2.1)^a	0.50 (0.06)^a	31.9 (2.1)^a	658 (97)^a	2.7 (0.5)^a	0.10 (0.02)^a	27.7 (0.8)^a	689 (125)^a
WI	3.6 (0.6)^a	23.8 (3.5)^a	16.9 (4.3)^a	0.55 (0.12)^a	29.4 (2.3)^a	530 (95)^a	2.3 (0.1)^a	0.10 (0.01)^a	23.7 (1.0)^a	745 (75)^a
FI	4.5 (0.7)^a	28.9 (4.1)^a	45.3/37.1 (3.3–1.7)^b	1.47 (0.11)^b	28.6 (0.4)^a	587 (102)^a	3.9 (0.5)^b	0.15 (0.02)^b	25.9 (0.6)^a	653 (62)^a
WFI	5.1 (0.6)^a	33.6 (4.1)^a	33.0 (3.5)^b	1.16 (0.11)^b	28.4 (1.2)^a	636 (110)^a	3.1 (0.6)^b	0.12 (0.03)^b	26.1 (1.8)^a	764 (75)^a

Different letters show different groups of mean values by column.