LANDIS-II Dictionary

posted Sep 23, 2014, 9:58 AM by Lesley Bross   [ updated Oct 3, 2014, 3:13 PM ]
BDA: Biological Disturbance Agent; extension only uses cohort age information

calibration: changing the model parameters to improve the fit of model output to empirical data; typically an iterative process on a subset of the landscape

cohort: defined by species and age; the time step determines age classes for cohorts

cohort removal list: component of prescription; determines which cohorts will be removed within every cell within the selected stand

disturbance extension: scenario can have none-to-many; each can have its own time step; generates maps and summary tables

ecoregion: group of one or more sites; aka: land types; assume homogeneous climate and soils; not required to be contiguous; may be inactive and excluded from model 

extent: overall size of the landscape; If extent is increased, processing time increases linearly

management area: defines collections of stands to which specific harvesting prescriptions will be applied; Need not be contiguous

NPP: Net Primary Productivity

output extension: scenario can have none-to-many; generates maps and/or tables

PAR: Photosynthetic Active Radiation; input to PnET

prescription: describes harvesting criteria and target species cohorts; determines which stands qualify for harvest and define ranking; separate rankings are defined for each management area; can be shared across management areas; defines how stands are selected and what happens after they are selected

ranking: component of prescription; defines preferred order that stands will be selected for harvest

resolution: minimum mapping unit within a landscape; Increasing the resolution increases processing time expotentially

PnET: Series of 3 models the simulate carbon, water, and nitrogen dynamics of forest ecosystems

site: basic landscape unit (individual cell); tracks cohort data; cohorts can react individually within a site

Spatially dynamic process: A process is a function of neighboring entities; aka: contagious or landscape process; Example spatially dynamic processes: seed dispersal, fire spread, insect outbreaks; LANDIS-II can model spatially dynamic processes

SOM: Soil Organic Matter (Century extension)

stands: finer unit of harvest than management areas; may not belong to > 1 management area; 

succession extension: scenario can only have one; includes above-ground dynamics but may include below-ground C/N dynamics