Effects of nitrogen addition and drought on the relationship between nitrogen- and water-use efficiency in a temperate grassland

Ecological Processes

Table 1 Results of three-way ANOVA to test the effects of N addition, drought and species identity on WUE_INST, NUE_INST, WUE_LT and NUE_LT

	df	WUE_INST		NUE_INST		WUE_LT		NUE_LT
	df	F	p value	F	p value	F	p value	F	p value
N addition (N)	1	3.81	0.055	8.61	0.004	17.23	< 0.001	167.16	< 0.001
Drought (D)	1	8.63	0.004	44.36	< 0.001	247.64	< 0.001	115.90	< 0.001
Species (S)	5	1.39	0.267	13.09	< 0.001	26.53	< 0.001	54.61	< 0.001
N × D	1	0.37	0.547	9.88	0.002	5.44	0.022	38.32	< 0.001
N × S	5	0.21	0.959	2.11	0.074	0.89	0.490	2.77	0.022
D × S	5	0.49	0.781	2.09	0.076	3.73	0.004	25.53	< 0.001
N × D × S	5	0.7	0.627	0.55	0.739	1.29	0.276	5.35	< 0.001