Table 3.

Linear regressions of phospholipid fatty acid biomarkers and various soil parameters

PLFA biomarkers\Soil parameter		Water content	Soil temp	Cellob.	Chitin.	N-acet.	L-pept.	Ph.ox.	Perox.	Act. prot.	Gluc. p.	dN	DOC: dN
Gram-positive	i15:0		0.36				0.52	0.37	0.56
	a15:0		0.30				0.50	0.33	0.47
	i16:0		0.38				0.36	0.38	0.45
	i17:0		0.36					0.27	0.29
	a17:0		0.27
Actinomycetes	10me16
Gram-negative	18:1ω7
	cy17:0
	16:1ω7					0.27	0.40	0.30	0.54
	16:1ω9		0.36				0.49	0.27	0.36
	cy18:0						0.32	0.34
	cy19:0
	16:1ω5			0.28	0.36		0.35	0.31	0.29	0.28
Bacteria	18:1ω5												0.27
	17:00
	15:00		0.36				0.41	0.35	0.55
	17:1ω6
Fungi	18:2ω6				0.29					0.36	0.27		0.35
	18:1ω9
F&P	18:3ω3				0.26					0.27	0.57		0.38
General	14:00		0.36				0.55	0.38	0.58
	16:00		0.33				0.32	0.30	0.36
	16:1ω11			0.28	0.32		0.41	0.31	0.33
	16:1ω6		0.37		0.27		0.35		0.35
	17:1ω6						0.25
	18:00		0.26						0.28		0.28
Groups	Gram+		0.36				0.47	0.36	0.50
	Gram−
	Bacteria		0.27				0.41	0.34	0.38
	Fungi
	All		0.26		0.35	0.30	0.37		0.34
Processes	Cellob.			1.00	0.42	0.32
	Chitin.			0.42	1.00	0.62					0.35
	N-acet.			0.32	0.62	1.00				0.37
	L-pept.						1.00		0.30
	Ph.ox.		0.34					1.00	0.52
	Perox.		0.47				0.30	0.52	1.00
	Act. prot.					0.37				1.00			0.32
	Gluc. p.				0.35						1.00

Presented are goodness of fit (R²) of statistical significant (P< 0.01) relationships between parameters; empty fields indicate that the regression was not significant. Bold values show R² > 0.5. Regressions are based on data from control and girdling plots from all samplings over the 2-yr sampling period (mean values of each sampling). Cellob., cellobiosidase; Chitin., chitinase; N-acet., N-acetyl-glucosaminidase; L-pept., leucine-peptidase; Ph.ox., phenoloxidase; Perox., peroxidase; Act. prot., actual protease; Gluc. p., glucose production; dN, total dissolved nitrogen; F&P, fungi and plants; DOC, dissolved organic carbon; PFLA, phospholipid fatty acid.