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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

ParametersPearsonKendall_tau_bSpearman_rho
CoefficientSig.(bilateral)NCoefficientSig.(bilateral)NCoefficientSig.(bilateral)N
Precipitation0.977bP < 0.010190.908bP < 0.010180.973bP < 0.01019
Temperature0.484aP = 0.042190.307P = 0.075180.463P = 0.05319
NDVI0.390P = 0.110190.333P = 0.053180.490P = 0.039a19
  1. a indicates significant correlation at 0.05 level; b indicates significant correlation at 0.01 level