Table2 Variance analysis of influences factors on soil nutrients in Weibei dry-land.

Factors	Available potassium mg/kg		Total nitrogen g/kg		Nitrate nitrogen mg/kg		Ammonium nitrogen mg/kg		Available phosphorus mg/kg		Sulfate ion mmol/kg
Factors	F	P	F	P	F	P	F	P	F	P	F	P
Age	3.072	0.059	12.01	0.000	3.4	0.044	8.676	0.001	5.492	0.008	3.477	0.042
Slope direction	0.687	0.413	0.094	0.761	0.077	0.783	9.167	0.005	0.006	0.937	0.119	0.732
Depth	3.541	0.039	1.31	0.282	1.254	0.297	18.29	0.000	0.676	0.515	0.065	0.937
Age * Slope direction	0.175	0.84	0.339	0.715	0.27	0.765	4.067	0.026	0.678	0.514	0.505	0.608
Age * Depth	0.354	0.839	0.363	0.833	0.185	0.945	1.247	0.309	0.76	0.558	0.74	0.571
Slope direction * Depth	0.395	0.676	0.842	0.439	0.199	0.821	0.894	0.418	0.556	0.578	0.203	0.817
Age * lope direction * Depth	1.157	0.346	1.343	0.273	0.292	0.881	8.101	0.002	0.071	0.99	0.296	0.879

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