Deterministic three-half-order kinetic model for microbial degradation of added carbon substrates in soil
The kinetics of mineralization of carbonaceous substrates has been explained by a deterministic model which is applicable to either growth or nongrowth conditions in soils. The mixed-order nature of the model does not require a priori decisions about reaction order, discontinuity period of lag or stationary phase, or correction for endogenous mineralization rates. The integrated equation is simpler than the integrated form of the Monod equation because of the following: (i) only two, rather than four, interdependent constants have to be determined by nonlinear regression analysis, (ii) substrate or product formation can be expressed explicitly as a function of time, (iii) biomass concentration does not have to be known, and (iv) the required initial estimate for the nonlinear regression analysis can be easily obtained from a linearized form rather than from an interval estimate of a differential equation. /sup 14/CO/sub 2/ evolution data from soil have been fitted to the model equation. All data except those from irradiated soil gave us better fits by residual sum of squares (RSS) by assuming growth in soil was linear (RSS =0.71) as opposed to exponential (RSS = 2.87). The underlying reasons for growth (exponential versus linear), no growth, and relative degradation rates of substrates are consistent with the basic mechanisms from which the model is derived. 21 references.
- Research Organization:
- Univ. of California, Riverside
- OSTI ID:
- 6981384
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 47:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIODEGRADATION
MATHEMATICAL MODELS
REACTION KINETICS
CARBONACEOUS MATERIALS
CARBON 14 COMPOUNDS
CARBON DIOXIDE
DATA ANALYSIS
LABELLED COMPOUNDS
METABOLISM
MINERALIZATION
REGRESSION ANALYSIS
SOILS
SUBSTRATES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
KINETICS
MATERIALS
MATHEMATICS
OXIDES
OXYGEN COMPOUNDS
STATISTICS
550701* - Microbiology- Tracer Techniques