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KMID : 1161520150190050332
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Animal Cells and Systems
2015 Volume.19 No. 5 p.332 ~ p.338
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Appropriate sampling points and frequency of CO2 measurements for soil respiration analysis in a pine (Pinus densiflora) forest
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Jung Se-Hoon
Kwon Dong-Joo
Park Chan-Woo
Kim Seong-Deog
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Abstract
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Standard protocols are required for the accurate measurement of global soil respiration rates. This research aimed to determine the appropriate sampling frequency for pine forest soil respiration rates by quantifying the optimal number of measurement chambers and Q10 values. We used an automatic open/closed chamber system with 16 chambers to obtain a high level of reliability about soil respiration rates. On average, 57 and 14 chambers were required to obtain 10% and 20% margins of error at the 95% confidence level, while 38 and 9 chambers were required for these 2 error margins at the 90% confidence level, respectively. Thus, our data were in the range of the 20% margin of error at the 95% confidence level. ANOVA statistical tests also separated the minimum required measurement interval into two groups using Q10 values based on actual measured temperatures: (1) short-term sampling intervals of 1 and 3 days and (2) long-term intervals of 7, 14, 20, and 30 days. Our results indicate that 3 days is the optimal interval for soil respiration measurement. The total amount of soil respiration was estimated as 9.35?t?C?ha?1?yr?1 in a pine forest, with soil respiration rates being positively related with temperature.
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KEYWORD
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AOCC system, spatial variation, Q10, coefficient of variation
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