Forest Ecosystems

Table 3 The correlations between fluctuations (deviation from the mean) of net primary productivity (NPP) and the driving factors (annual precipitation, annual temperature and normalised difference vegetation index (NDVI))

From: Variation of net primary productivity and its drivers in China’s forests during 2000–2018

Parameters	Pearson			Kendall_tau_b			Spearman_rho
Parameters	Coefficient	Sig.(bilateral)	N	Coefficient	Sig.(bilateral)	N	Coefficient	Sig.(bilateral)	N
Precipitation	0.977^b	P < 0.010	19	0.908^b	P < 0.010	18	0.973^b	P < 0.010	19
Temperature	0.484^a	P = 0.042	19	0.307	P = 0.075	18	0.463	P = 0.053	19
NDVI	0.390	P = 0.110	19	0.333	P = 0.053	18	0.490	P = 0.039^a	19

^a indicates significant correlation at 0.05 level; ^b indicates significant correlation at 0.01 level

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