Field Scale Studies on the Spatial Variability of Soil Quality Indicators in Washington State, USA

Table 1

Univariate statistics for measured soil properties (𝑛=220). Total C, pH, EC: electrical conductivity; SIRC: microbial biomass C by substrate-induced respiration; RESP: nonamended soil respiration; PNP: phosphatase activity; TPF, dehydrogenase activity and qCO₂, metabolic quotient.

	Chemical Properties			Biological Properties
	C	PH	EC	SIRC	RESP	PNP	TPF	qCO2a
	(%)		(dS m^−1)	(mg C kg^−1)	(mg C kg^−1 h^−1)	(μmol g^−1 min^−1 × 10^−2)	(μmol g^−1 min^−1 × 10^−5)	(×10^−3)
Mean	1.70	5.14	2.13	642	1.65	3.91	4.33	1.04
Median	1.76	5.12	2.00	620	1.41	3.85	4.36	1.04
SD	0.67	0.24	0.68	198	1.17	1.30	1.57	0.44
% CV	39.6	4.70	32.0	31	71.0	33.2	36.1	42.4
Skewness	−0.22	0.12	1.81	1.5	4.35	0.53	0.12	0.62
Minimum	0.35	4.56	0.95	227	0.53	1.13	0.75	0.12
Maximum	2.97	5.74	5.79	1694	9.44	9.21	7.96	2.61

^aμg CO₂-C g⁻¹ h⁻¹/ μg biomass C g⁻¹ soil.