- Contributed Oral Session 101: Biogeochemistry
Wednesday, August 10, 1:30 PM - 5:00 PM, Meeting Room 520 A, Level 5, Palais des congrès de Montréal
ESA Public Affairs Committee Meeting
Tuesday, August 9, 7:00 AM - 8:30 AM, Meeting Room 512 B, Level 5, Palais des congrès de Montréal
ESA Vegetation Classification Panel Business Meeting
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Ecology / Ecological Monographs Editors Meeting
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ESA Research Committee Meeting
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ESA International Relations Committee Meeting
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ESA Biogeosciences Section Grad Student Breakfast
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Federation of the Americas
Wednesday, August 10, 8:00 AM - 9:00 AM,
VIP awards Recipient / Governing Board Reception (Invitation Only)
Monday, August 8, 5:00 PM - 5:45 PM, Belvedere Patio 715, Level 7, Palais des congrès de Montréal
Contributed Oral Session 87: Rare, Threatened, and Endangered Species: Flora; Habitat
Wednesday, August 10, 8:00 AM - 11:30 AM, Meeting Room 522 A, Level 5, Palais des congrès de Montréal
FT - 13: Charlevoix, an ecotouristic visit (Three nights)
, 8:00 AM - 2:00 PM, Viger Bus Terminal, Palais des congrès de Montréal
Contributed Oral Session 67: Fire Ecology: Restoration and Dynamics
Tuesday, August 9, 1:30 PM - 5:00 PM, Meeting Room 520 C, Level 5, Palais des congrès de Montréal
WK - 11: Tidball: Ecology education: Global cooperation and perspectives
Sunday, August 7, 8:00 AM - 5:00 PM, Meeting Room 511 C, Level 5, Palais des congrès de Montréal
WK - 2: Krasny: Teaching ecology in urban gardens
Saturday, August 6, 9:00 AM - 4:00 PM, Meeting Room 513 C, Level 5, Palais des congrès de Montréal
Large variability on the temperature sensitivity of soil respiration (Q10): considerations of influencing factors.
Zhou, Xuhui1, Luo, Yiqi1, Zhou, Tao1, Xu, Tao1, 1 University of Oklahoma, Norman, OK, USA
ABSTRACT- Large variability of the temperature sensitivity of soil respiration (Q10) has been found in field studies when soil respiration is fitted to simple temperature dependence equations. These equations do not include the confounding effects of other factors. Previous studies have also shown that Q10 values are affected by various factors, including temperature, moisture, substrate supply, and biomass. This study examines the uncertainties of various factor effects on high Q10 variability. Multiplicative formulation of different factors was used to simulate soil respiration rates, and then Q10 value was calculated by an exponential function based on a whole–year data and different ranges of parameters. The values decreased with increasing temperature, leaf area index (LAI), and root biomass. Q10 showed a parabolic response to soil moisture, which increased, reached maximum, and decreased with increase in moisture. Q10 values have an inverse parabolic response to increasing microbial biomass, which decreased, reached minimum, and increased. However, soil moisture reduced Q10 values, and LAI and biomass increased Q10 values compared to temperature-only effects from the whole–year data. The factorial combination depressed the Q10 values in comparison to single-factor effects, and the five-factor combination makes the Q10 value equal to the global median value of 2.4. Our results indicate that the factorial combination is useful to simulate soil respiration rates as well as Q10 values, and parameter ranges should be considered when using temperature sensitivity of soil respiration to extrapolate climate change effects in local and global ecosystem models.
Key words: soil respiration, Q10, soil temperature and moisture, substrate supply and biomass