COORDINATION OF PICUS MODEL FORMATS IN R LANGUAGE FOR POPULATION DYNAMICS IN FOREST BASED ON CHANGES IN SINGLE MORPHOLOGICAL PARAMETER

摘要

Forests are particularly sensitive to climate change. One of the main tools for the assessment of climate-related changes in forest dynamics was various forest ecosystem models such as PICUS. Results derived from simulations-based ecological models differ as a rule from results obtained from the measurement-based data of empirical experiments. This required a subsequent analysis in order to better understand the differences between simulations and reality. It can be done with appropriate libraries in R language: (1) to make the simulated data accessible for basic modules for ecological analysis; (2) to check their compatibility with basic graphic representations in environmental packages; (3) to present the simulation data presentation as time series (ts object) and make them available for analysis with appropriate ts-packages, and (4) to coordinate the type of presentation and analysis with the types of empirical data. This paper presents R-code followed by an explanation for the unification of PICUS simulated as well as empirical data as objects in R which can be subject to a joint analysis. The investigation was carried out by tracking of single parameter changes in the single morphological parameter DIEDCOUNT, in order to forecast forest population dynamics in seedlings of single species sessile oak population.