About

New procedure is a combination of a VS-CD model (cambial forecasting software, Belousova et. al, 2021) and timing procedure (Popkova et. al, 2018).

VS-CD model id a submodel of the process-based tree-ring VS-model. It is a new algorithm of cambial functioning without additional year-to-year parameter adjustment. This model is based on the hypothesis that external climatic factors regulate the concentration of the differentiation inhibitor in each cambial cell, gradually decreasing with the distance from the initial cell. A differentiation inhibitor is defined as a hypothetical substance that promotes cambium formation. Practically, this can be expressed as the balance of auxins and cytokinins or the balance of substrates (sugars) and enzymes, etc.

Based on the simulated integral growth rates an additional block of the model successfully generates realistic tracheidograms. The strong relationship between the integral growth rates and the tracheid sizes was used to predict xylogenesis from daily climatic condition. The generalized model is supplemented with a module for determining the timing of cell transition from the cambial zone to the enlargement zone, as well as a module for cell enlargement.Input data are based on results of the VS and the VS-CD modeling.

Using the results of climate modeling by the VS model, the procedure calculates cell production, the step-by-step development of the cambium, the exact time of cell appearance in the season and the dynamics of enlargement of each cell in a radial file.

The output data contains data sets of cell development dynamics in a season and diagrams of cell enlargement (see diagram below).

The R script below is a workflow example for a procedure running and using. For all questions concerning the launch and operation of the application, please contact the developer: Daria Belousova, daryadarya1611@gmail.com.