Journal
BIOGEOCHEMISTRY
Volume 131, Issue 3, Pages 255-265Publisher
SPRINGER
DOI: 10.1007/s10533-016-0277-6
Keywords
Decomposition; Extracellular enzymes; Temperature sensitivity; Experimental warming
Funding
- NSF [DEB-1242013]
- University of Georgia's Office of the Vice-President for Research (OVPR)
- Direct For Biological Sciences
- Division Of Environmental Biology [1242013] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Emerging Frontiers [1318164] Funding Source: National Science Foundation
- Emerging Frontiers
- Direct For Biological Sciences [1137364] Funding Source: National Science Foundation
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Climate change may affect the microbial production and temperature sensitivity of extracellular enzymes that release carbon (C) and nutrients from soil organic matter. We measured the response of six hydrolytic enzymes involved in C, nitrogen (N), and phosphorus (P) degradation to experimental warming in a mixed-deciduous forest persisting on highly-weathered Ultisols (Whitehall Forest, Georgia, US). We found that warming produced no consistent enzyme response. However, we observed significant seasonal variation in enzyme activities, temperature sensitivities and elemental enzyme ratios (C:N and C:P). Seasonal differences in enzyme activity and temperature sensitivity were best explained by soil moisture and temperature. Our results suggest that seasonal dynamics in soil microclimate, organic matter supply, and microbial demand exert more control on enzyme dynamics than does a uniform increase in soil temperature.
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