County-Scale Spatial Distribution of Soil Enzyme Activities and Enzyme Activity Indices in Agricultural Land: Implications for Soil Quality Assessment

Table 2

Correlation coefficients (Pearson value) between soil physicochemical properties and enzyme activities in surface horizon (0–20 cm) of Changwu County ().

	Invertase	Urease	Phosphatase	Catalase	Dehydrogenase
OM	0.547^**	0.386^**	0.580^**	−0.06	0.469^**
Total N	0.300^**	0.431^**	0.243^**	0.255^**	0.03
Total P	−0.06	0.317^**	−0.176^**	0.315^**	−0.325^**
Total K	0.11	0.11	0.12	−0.213^**	0.246^**
Alkali-hydrolyzable N	0.393^**	0.192^**	0.486^**	−0.462^**	0.552^**
Available P	0.05	0.366^**	0.09	−0.186^**	−0.02
Available K	0.00	0.358^**	0.147^*	0.09	−0.06
CEC	0.11	0.291^**	−0.13	0.718^**	−0.322^**
Clay	0.11	0.127^*	0.02	0.297^**	−0.10
pH	−0.167^**	−0.380^**	0.05	−0.529^**	0.154^*

* and ** represent statistical significances at the 5% and 1% levels, respectively; OM, organic matter; N, nitrogen; P, phosphorous; K, potassium; and CEC, cation exchange capacity.