Changes of soil carbon along precipitation gradients in three typical vegetation types in the Alxa desert region, China

Table 3 Pearson correlation analysis between SOCD and SICD and environmental variables

Variables	Depths(cm)	PT	MAP	MAT	SMC	BD	pH	ST
SOCD	0–20	0.172	0.767**	−0.414	0.401**	0.457*	0.325	0.536*
	20–40	0.291	0.751**	−0.365	0.370**	0.334	0.343	0.421*
	40–60	0.17	0.850**	−0.398	0.312**	0.358	0.593*	0.432
	60–80	0.052	0.807**	−0.462	0.332*	0.292	0.206	0.571*
	80–100	0.014	0.69**	−0.369	0.411**	0.145	0.387	0.668**
	100–150	0.118	0.498*	−0.284	0.658**	0.034	0.014	0.647**
	150–200	0.313	0.557	−0.312	0.42*	0.317	0.137	0.545*
	200–250	0.316	0.194	−0.249	0.368	0.107	-0.465*	0.581*
	250–300	0.338	0.381	−0.262	0.071	0.201	-0.142*	0.479*
SICD	0–20	0.296	0.653**	0.424	0.518*	0.017	0.553	0.376
	20–40	0.346	0.75**	0.368	0.68*	0.031	0.391	0.545*
	40–60	0.117	0.723**	0.421	0.509*	0.139	0.417*	0.424*
	60–80	0.119	0.808*	0.368	0.411	0.159	0.396	0.504*
	80–100	0.096	0.846*	0.483	0.594*	0.033	0.552*	0.408**
	100–150	0.272	0.658	0.361	0.479	0.333*	0.527*	0.598*
	150–200	0.244	0.556	0.219	−0.26*	0.066	0.719*	0.505*
	200–250	0.435	0.192	0.367	−0.302	0.104	0.652**	0.661**
	250–300	0.172	0.274	0.234	−0.205	0.128	0.649**	0.704**

^*denotes significant correlation at the P < 0.05 probability level. **indicates significant correlation at the P < 0.01 probability level. Plant type (PT), multi-annual average precipitation (MAP), multi-annual average temperature (MAT), soil moisture content (SMC) Soil bulk density (BD), Soil type (ST)

ISSN: 1750-0680