Table 5.

Ecoenzymatic activity by horizon, location, and N treatment.

Horizon	Location	N trt	AAP		AP		NAG		BG		AG
			nmol g-1 d-1	SD	nmol g-1 d-1	SD	nmol g-1 d-1	SD	nmol g-1 d-1	SD	nmol g-1 d-1	SD
Biocrust 0.5 cm	Canopy	Amb	43.0	29.7	38.9	29.2	15.3	14.8	56.7	32.2	2.91	2.89
Biocrust 0.5 cm	Interspace	Amb	31.4	26.5	32.8	26.5	2.94	2.06	26.6	31.2	2.48	7.14
Soil 10 cm	Canopy	Amb	16.0	11.8	6.34	7.08	2.28	1.87	18.5	9.9	1.28	2.64
Soil 10 cm	Interspace	Amb	19.0	14.9	4.43	4.86	0.71	0.55	11.7	12.3	0.31	0.36
Biocrust 0.5 cm	Canopy	N7	34.8	22.7	30.0	32.2	11.4	16.0	55.4	35.5	4.13	5.68
Biocrust 0.5 cm	Interspace	N7	17.6	11.2	16.2	16.8	1.38	1.49	22.4	21.7	0.57	0.58
Soil 10 cm	Canopy	N7	29.7	25.4	15.3	18.2	2.77	2.53	25.1	16.8	1.00	1.53
Soil 10 cm	Interspace	N7	22.4	18.8	17.9	18.3	0.54	0.54	12.4	14.8	0.29	0.42
Biocrust 0.5 cm	Canopy	N15	41.2	23.3	14.8	13.7	7.20	4.69	40.9	23.2	3.31	3.95
Biocrust 0.5 cm	Interspace	N15	33.7	18.1	14.7	15.9	2.79	3.30	23.2	15.0	1.37	1.31
Soil 10 cm	Canopy	N15	32.9	22.2	7.35	11.3	2.58	1.92	23.2	14.7	1.71	1.94
Soil 10 cm	Interspace	N15	34.5	30.5	7.31	4.21	0.90	0.91	11.2	9.3	1.19	1.70

AAP, alanine aminopeptidase; AP, alkaline phosphatase; NAG, β-N-acetylglucosaminidase; BG, β-glucosidase; AG, α-glucosidase.