TABLE 1.

Main characteristics of grassland soil from Jasper Ridge field

Parameter	Value
Ammonium concn [μg NH4+ (gdw soil)−1]	13.1 ± 1.2
Nitrate concn [μg NO3− (gdw soil)−1]	5.7 ± 0.0
pH with water/CaCl2	6.0/5.1
100%WHC [g water · (100 gdw soil)−1]	25.2
Soil temperature (at 2 cm below surface)
At time of sampling	27°C
2003-2004 range	8-34°C
2003-2004 avg	19°C
Parent material	Sandstone
Carbon, nitrogen (%)	1.197 ± 0.298 C, 0.106 ± 0.034 N
Location	Santa Cruz Mountains
Sampling date	September 2003
References	13, 27