Effects of simulated acid rain on soil respiration and its component in a mixed coniferous-broadleaved forest of the three gorges reservoir area in Southwest China

Li, Yifan; Wang, Yunqi; Wang, Yujie; Wang, Bin

doi:10.1186/s40663-019-0192-0

Forest Ecosystems

Table 2 Repeated-measures ANOVA for the split-plot experiments. SS: sum of squares; MS: mean of squares

From: Effects of simulated acid rain on soil respiration and its component in a mixed coniferous-broadleaved forest of the three gorges reservoir area in Southwest China

Variable	Source	SS	df	MS	F-ratio	P
5-cm soil temperature	RC	0.04	1.00	0.04	0.65	0.428
	SAR	0.42	3.00	0.14	2.04	0.135
	RC × SAR	0.31	3.00	0.11	1.54	0.231
	Times	20,715.41	23.00	900.67	17,913.89	< 0.001
	Times × SAR	2.05	69.00	0.03	0.59	0.996
	Times × RC × SAR	3.23	69.00	0.05	0.93	0.635
	Error	27.75	552.00	0.05
5-cm soil water content	RC	18.31	1.00	18.31	57.55	< 0.001
	SAR	1.97	3.00	0.66	2.07	0.131
	RC × SAR	0.93	3.00	0.31	0.97	0.423
	Times	2472.13	23.00	107.48	248.51	< 0.001
	Times × SAR	22.89	69.00	0.33	0.77	0.915
	Times × RC × SAR	28.49	69.00	0.41	0.95	0.583
	Error	238.75	552.00	0.43
Soil CO₂ fluxes	RC	59.65	1.00	59.65	10,170.22	< 0.001
	SAR	14.35	3.00	4.78	815.45	< 0.001
	RC × SAR	0.08	3.00	0.03	4.46	0.013
	Times	237.54	23.00	10.33	1573.07	< 0.001
	Times × SAR	6.37	69.00	0.09	14.07	< 0.001
	Times × SAR × RC	1.92	69.00	0.03	4.23	< 0.001
	Error	3.62	552.00	0.01
Annual mean soil respiration rate	RC	5.33	1.00	5.33	11,281.11	< 0.001
	SAR	1.24	3.00	0.41	878.23	< 0.001
	RC × SAR	0.01	3.00	0.00	4.86	0.009
	Times	0.52	1	0.52	1200.66	< 0.001
	Times × SAR	0.19	3	0.06	143.03	< 0.001
	Times × SAR × RC	0.02	3	0.01	15.67	< 0.001
	Error	0.01	24	0.00
Annual cumulative soil respiration	RC	673,061.58	1	673,061.58	25,420.13	< 0.001
	SAR	135,053.87	3	45,017.96	1700.23	< 0.001
	RC × SAR	6120.43	3	2040.14	77.05	< 0.001
	Times	2547.28	1	2547.28	113.30	< 0.001
	Times × SAR	651.49	3	217.16	9.66	< 0.001
	Times × SAR × RC	651.49	3	217.16	9.66	< 0.001
	Error	539.59	24	22.48
Soil pH	RC	1.272	1	1.272	351.883	< 0.001
	SAR	0.475	3	0.158	43.785	< 0.001
	RC × SAR	0.009	3	0.003	0.852	0.479
	Times	1.44	3.00	0.48	69.66	< 0.001
	Times × SAR	0.28	9.00	0.03	4.53	< 0.001
	Times × RC × SAR	0.08	9.00	0.01	1.30	0.251
	Error	0.49	72.00	0.01
Fine root biomass	SAR	0.51	3.00	0.17	8.48	0.003
	Times	0.59	3.00	0.20	5.36	0.004
	Times × SAR	0.95	9.00	0.11	2.88	0.012
	Error	1.33	36.00	0.04

RC indicate respiration components (R_S and R_h). SAR indicate simulated acid rain

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