Filters: Tags: Parameter estimation (X) > Types: Journal Citation (X)
2 results (48ms)|
Filters
Date Range
Extensions Types Contacts Categories |
We integrated soil models with an established ecosystem process model (SIPNET, simplified photosynthesis and evapotranspiration model) to investigate the influence of soil processes on modelled values of soil CO2 fluxes (RSoil). Model parameters were determined from literature values and a data assimilation routine that used a 7-year record of the net ecosystem exchange of CO2 and environmental variables collected at a high-elevation subalpine forest (the Niwot Ridge AmeriFlux site). These soil models were subsequently evaluated in how they estimated the seasonal contribution of RSoil to total ecosystem respiration (TER) and the seasonal contribution of root respiration (RRoot) to RSoil. Additionally, these soil...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Ecosystems,
Springer,
ecosystem model,
eddy covariance,
heterotrophic respiration,
Survival or extinction of an endangered species is inherently stochastic. We develop statistical methods for estimating quantities related to growth rates and extinction probabilities from time series data on the abundance of a single population. The statistical methods are based on a stochastic model of exponential growth arising from the biological theory of age or stagestructured populations. The model incorporates the socalled environmental type of stochastic fluctuations and yields a lognormal probability distribution of population abundance. Calculation of maximum likelihood estimates of the two unknown parameters in this model reduces to performing a simple linear regression. We describe techniques for rigorously...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: California Condor,
Ecological Monographs,
Kirtland's Warbler,
Laysan Finch,
Palila,
|
