Nitrogen addition to the canopy of Castanopsis chinensis (Sprengel) Hance promoted xylem formation in a subtropical forest in China

Table 4 Comparison of cambial cells and differentiating cells in C. chinensis between two treatments (control and N-treated trees) using repeated measures ANOVA during early and late growth seasons in 2015 and 2016. T represents the effect of N addition; D represents the effect of DOY; T × D represents the interaction effect of N addition and DOY; E represents early growth season (February to May in 2015 and February to April in 2016); L represents late growth season (June to December in 2015 and May to December in 2016). DOY represents the day of year

Cell types	Effect	Year 2015 (E)		Year 2015 (L)		Year 2016 (E)		Year 2016 (L)
Cell types	Effect	F	P	F	P	F	P	F	P
Cambium	T	0.008	0.931	0.281	0.596	4.119	0.044	9.451	0.002
	D	25.168	< 0.001	7.950	0.005	1.564	0.213	0.348	0.556
	T × D	2.166	0.144	2.866	0.092	1.511	0.221	0.093	0.761
Enlarging cells	T	7.434	0.007	2.900	0.090	6.096	0.015	1.735	0.189
	D	23.501	< 0.001	2.523	0.114	7.695	0.015	2.737	0.098
	T × D	1.055	0.306	0.154	0.695	0.626	0.430	0.064	0.800
Wall-thickening cells	T	2.472	0.119	0.191	0.663	4.203	0.042	2.993	0.085
	D	4.323	0.040	0.436	0.510	3.706	0.056	1.504	0.221
	T × D	2.471	0.119	0.326	0.569	0.820	0.366	0.711	0.400
Mature cells	T	9.288	0.002	4.658	0.032	7.072	< 0.001	0.258	0.612
	D	7.341	0.007	15.564	< 0.001	20.450	< 0.001	2.013	0.157
	T × D	19.052	< 0.001	1.854	0.175	6.288	0.013	2.801	0.095

ISSN: 1297-966X