Spatial characteristics of nutrient allocation for Picea crassifolia in soil and plants on the eastern margin of the Qinghai-Tibet Plateau

Table 3 Statistical characteristics of the overall soil layer (0–40 cm) nutrient traits (SOC, TN, TP and SOC:TN:TP ratio) for soil samples in the Qilian Mountains

Parameters	Min	Max	Mean ± SD	Skewness	Kurtosis	CV
SOC(g/kg)	45.22	99.49	74.32 ± 1.99	-0.51	2.12	0.14
TN(g/kg)	0.25	5.06	2.59 ± 0.28	0.37	-0.55	0.58
TP(g/kg)	0.09	0.83	0.37 ± 0.03	0.55	-0.69	0.56
SOC:TN	14.19	177.35	44.79 ± 7.21	2.18	5.28	0.84
SOC:TP	88.08	705.96	273.25 ± 29.50	0.99	0.64	0.56
TN:TP	1.99	17.64	8.08 ± 0.09	0.70	0.15	0.58

the skewness and kurtosis were used to test the normality of the data. skewness = 0, indicating normal distribution, skewness > 0, indicating the right skewness distribution, skewness < 0, indicating a left-skewed distribution; Kurtosis = 3, indicating normal distribution, Kurtosis > 3, indicating fat tails, Kurtosis < 3, indicating thin tails; CV(coefficient of variation) = SD/Mean

ISSN: 1471-2229