County-Scale Spatial Distribution of Soil Enzyme Activities and Enzyme Activity Indices in Agricultural Land: Implications for Soil Quality Assessment
Table 4
Pearson correlation coefficients between soil physicochemical properties and enzyme activity indices in surface horizon (0–20 cm) of Changwu County.
Samples
Orchard
Cropland
Total
()
()
()
Enzyme activity index
TEI
GME
TEI
GME
TEI
GME
OM
0.566**
0.569**
0.696**
0.693**
0.659**
0.655**
Total N
0.299**
0.315**
0.459**
0.448**
0.407**
0.395**
Total P
−0.103
−0.09
0.095
0.054
0.021
−0.021
Total K
0.291*
0.252*
0.137
0.118
0.179**
0.142*
Alkali-hydrolyzable N
0.314**
0.287*
0.543**
0.574**
0.459**
0.461**
Available P
0.074
0.086
0.353**
0.355**
0.187**
0.139*
Available K
0.217
0.217
0.267**
0.238**
0.235**
0.175**
CEC
0.092
0.109
0.174*
0.137
0.148*
0.121
Clay
0.063
0.057
0.12
0.091
0.103
0.086
pH
−0.280*
−0.294*
−0.277**
−0.259**
−0.271**
−0.243**
Invertase
0.707**
0.688**
0.655**
0.661**
0.663**
0.673**
Urease
0.501**
0.486**
0.739**
0.699**
0.624**
0.559**
Phosphatase
0.749**
0.751**
0.725**
0.729**
0.712**
0.737**
Catalase
0.149
0.174
0.267**
0.232**
0.225**
0.219**
Dehydrogenase
0.811**
0.801**
0.681**
0.705**
0.690**
0.729**
GME
0.990**
1
0.986**
1
0.981**
1
* and ** represent statistical significances at the 5% and 1% levels, respectively; OM, organic matter; N, nitrogen; P, phosphorous; K, potassium; CEC, cation exchange capacity; GME, geometric mean of enzyme activities; and TEI, total enzyme activity.
