		Nitrogen	Soil organic matter	Accumulated temperature	Accumulated rainfall
0 - 10 cm	Pearson correlation coefficients	0.236	0.313*	−0.227	0.032
0 - 10 cm	Test of significance (α)	0.07	0.015	0.479	0.922
10 - 20 cm	Pearson correlation coefficients	−0.123	0.041	−0.051	−0.123
10 - 20 cm	Test of significance	0.35	0.758	0.874	0.704