期刊
BIOGEOCHEMISTRY
卷 117, 期 1, 页码 205-227出版社
SPRINGER
DOI: 10.1007/s10533-013-9932-3
关键词
Agent-based model; Enzymes; Soil food web; Spatial distribution; Trophic structure
资金
- US National Science Foundation [OPP-0425606, DEB-0423385, DEB-0840869, ARC-0909441, DEB-0919383]
- Direct For Biological Sciences
- Division Of Environmental Biology [1027319] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [0840869, 1026843] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0909507] Funding Source: National Science Foundation
We developed agent-based models patterned after the equation-based models developed by Schimel and Weintraub (Soil Biol Biochem 35:549-563, 2003) to explore the influence of microbial-derived extracellular enzymes on carbon (C) dynamics. The models featured spatial arrangements of detritus as either randomly-spaced particles (rain) or as root-like structures (root), detritus input intervals (continuous vs. pulsed) and rates (0-5,000 units in 500 unit intervals), trophic structures (presence or absence of predators preying on microbes), and extracellular enzymes with different half-lives (1, 10, 100, and 1,000 time steps). We studied how these features affected C dynamics and model persistence (no extinctions). Models without predators were more likely to persist than those with predators, and their C dynamics could be explained with energetics-based arguments. When predators were present, two of the four model configurations-root-continuous and rain-pulsed-were more likely to persist. The root-continuous models were more likely to persist at lower detritus input rates (500-3,500 units), while the rain-pulsed models were more likely to persist at intermediate detritus input rates (2,000-3,500 units). For both these model configurations, shorter extracellular enzyme half-lives increased the likelihood of persistence. Consistent with the results of Schimel and Weintraub (Soil Biol Biochem 35:549-563, 2003), C dynamics was governed by extracellular enzyme production activity and loss. Our results demonstrated that extracellular enzyme control of C dynamics depends on the spatial arrangement of resources, the input rate and input intervals of detritus and trophic structure.
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