County-Scale Spatial Distribution of Soil Enzyme Activities and Enzyme Activity Indices in Agricultural Land: Implications for Soil Quality Assessment
Table 1
Descriptive statistics of selected soil physicochemical properties and enzyme activities in surface horizon (0–20 cm) of Changwu County, Shaanxi Province, China ().
Parameters
Range
Minimum
Maximum
Mean
Standard deviation
K-S Z Asymp. Sig. (2-tailed)
Skewness
Kurtosis
OM/g kg−1
13.09
5.16
18.25
12.57
2.22
1.21
0.11
−0.52
1.4
Total N/g kg−1
1.09
0.28
1.37
0.89
0.19
2.64
0.00
−0.46
0.78
Total P/g kg−1
1.45
0.17
1.62
0.67
0.26
2.51
0.00
1.14
1.95
Total K/g kg−1
11.42
16.68
28.1
22.23
1.95
2.23
0.00
0.19
0.1
Alkali-hydrolyzable N/mg kg−1
85.75
19.25
105
59.68
15.72
1.01
0.26
0.02
−0.04
Available P/mg kg−1
46.71
2.54
49.25
17.06
10.51
1.66
0.01
1.53
1.88
Available K/mg kg−1
450
63.13
513.13
199.36
94.22
0.76
0.62
0.8
−0.09
CEC/cmol kg−1
16.84
6.68
23.52
13.91
3.29
1.08
0.19
0.73
−0.12
Clay/%
33.09
17.41
50.5
33.19
5.14
1.59
0.01
0.51
2.27
pH
1.20
7.89
9.09
8.59
0.23
1.81
0.00
−0.64
0.14
Invertase/g glucose⋅g−1 soil⋅h−1
605.1
102.07
707.18
379.26
106.34
0.79
0.55
0.32
0.04
Urease/g NH4-N g−1 soil⋅h−1
104.7
3.16
107.86
37.86
20.07
1.38
0.05
0.77
0.3
Phosphatase/μg phenol⋅g−1 soil⋅h−1
56.55
15.12
71.67
34.88
8.83
0.79
0.57
0.57
1.24
Catalase/mL KMnO4⋅g−1 soil⋅h−1
8.55
4.58
13.13
8.79
1.97
0.86
0.44
0.11
−0.64
Dehydrogenase/g TPF⋅g−1 soil⋅h−1
2.91
0.15
3.06
1.29
0.63
0.99
0.28
0.48
−0.28
K-S Z, Kolmogorov-Smirnov Z; OM, organic matter; N, nitrogen; P, phosphorous; K, potassium; and CEC, cation exchange capacity.
