TABLE 2.

Temperature and pH ranges of cores and mesocosms in Yellowstone National Park^a

Mesocosm or core(s)	Plant(s) associated with mesocosm or core(s)	Initial pH range	Initial temp (°C) atb:		Annual temp range (°C) atc:
			5 cm	15 cm	5 cm	15 cm
Mesocosm 31	D. lanuginosum	4.5–7.5	31	46	5–44	19–56
Mesocosm 32	D. lanuginosum	4.4–6.3	35	50	2–44	12–58
Mesocosm 33	D. lanuginosum	4.7–5.4	24	36	1–38	11–45
Cores 36A-D	D. lanuginosum	4.6–4.9	34	41	9–34	14–41
Cores 37A-Cd	Mixed grasses	6.1–6.3	22	19	<0–22e	<0–14e
Cores 4A-D	D. lanuginosum	3.9–4.5	42	56	10–42	18–56
Cores 6A-D	D. lanuginosum	4.2–5.0	28	38	11–30	18–38
Cores 8A-D	D. lanuginosum	4.3–4.9	27	33	8–30	15–33
Cores 11A-D	Decaying log	2.7–4.0	98	107	55–98	91–107
Cores 13A-D	D. lanuginosum	4.2–4.7	43	47	8–43	14–47
Cores 25A-D	D. lanuginosum	3.9–4.2	20	23	2–24	10–24
Cores 27A-Dd	Lodgepole pine	NDf	9	7	ND	ND
Core 28Dd	Mixed grasses	ND	12	10	ND	ND
Core 29Ad	Sagebrush	ND	12	11	ND	ND
Core 34g	D. lanuginosum	4.2–4.4	3	8c	3–29	8–32
Core 35	D. lanuginosum	5.1–5.2	32	47	10–32	18–42

^aThe ambient air temperature at Amphitheater Springs ranged from −36°C in January 1997 to 32°C in August 1997. 

^bTemperatures were determined in September 1996 by using A cores. 

^cTemperatures were determined by using cores A through D. 

^dNongeothermal core(s). 

^eWhen the ground was frozen, the temperature was not recorded (<0°C). 

^fND, not determined. 

^gThe first core was collected in February 1997.