TABLE 1.

KBS LTER data on soil C, N, and microbial biomass for CT, HTS, and NTS treatments^a

Treat-ment	Total C (%)b	Microbial-biomass C (μg g−1)c	Direct microscopic counts (109 cells g of soil−1)		Soil pH	NO3− N (μg g of soil−1)d		NH4+ N (μg g of soil−1)d		Net nitrification in field (μg g−1 day−1)e	% of available NH4+ N converted in fieldf
			July 1994	August 1995		1994	1995	1994	1995
CT	0.81 ± 0.17a	186 ± 81a	0.9 ± 0.04a	1.9 ± 0.15b	6.8	4.2 ± 2.3a	1.9 ± 1.17a	2.7 ± 1.1a	2.6 ± 1.5a	0.19 ± 0.15	68
HTS	1.1 ± 0.21a	230 ± 118a	1.6 ± 0.03b	2.5 ± 0.12bc	NDg	0.7 ± 0.8a	0.6 ± 0.42a	4.1 ± 1.3a	4.5 ± 2.1a	0.12 ± 0.15	30
NTS	1.97 ± 0.17b	415 ± 114b	1.9 ± 0.05b	3.0 ± 0.13c	5.4	0.7 ± 1.0a	0.5 ± 0.35a	10.7 ± 3.3b	7.7 ± 2.1a	0.17 ± 0.17	21

^aMeans and standard deviations from all replicate plots for each treatment are shown. There were six replicate plots for CT and HTS and four replicate plots for NTS. Values followed by different letters indicate significant differences of at least P < 0.05. These data are from the KBS LTER Web site (7a). 

^bMeasured April and August 1994. 

^cMeasured August 1995. 

^dMeans of monthly data from May through November 1994 and April through November 1995. 

^eMeans of monthly measurements of net nitrification over 21 days from May through October 1994 and May through September 1995. 

^fPercentage based on the net increase in NO₃⁻ N after 21 days divided by the sum of the initial NH₄⁺ N pool plus the amount of inorganic N mineralized during incubation. Inorganic-N measurements before and after incubation were used to calculate percentages. 

^gND, not determined.