Lodging Effects

Parent Previous Next

The model simulates the impact of lodging on the light interception and on the photosynthesis processes, by linearly reducing integrated light interception and PAR conversion efficiency according to an approach proposed by Singh et al. (1999).

Lodging is quantified by assigning an adimensionless score factor relative to three main effects:

  1. topsoil saturation:



       where SAF30 is the total SAF in the first 30 cm of soil;

  1. wind speed:



       where WINDRUN is in km d-1 and LG_CRIT_WIND is a species parameter representing the minimum threshold for wind score;

  1. fresh mass weight



       where ADM (t ha-1) is the aerial dry mass, FSK (t ha-1) and SK (t ha-1) are the stalk fresh and dry masses respectively, LG_RATING is a species parameter specifying the full lodging score, LG_AMBASE (t ha-1) is a cultivar parameter representing aerial mass at which lodging starts, and LG_AMRANGE (t ha-1) is an ecotype parameter defining the effective range of lodging impact due to above ground mass.

These three factor are summed up and the score is effectively impacting only when its total value is positive and lower than a maximum threshold fixed by the LG_RATING parameter. The final factors influencing light interception (LI_LG_EFF) and photosynthesis (PARCE_LG_EFF) are calculated as:


































































Created with the Personal Edition of HelpNDoc: Easy EBook and documentation generator