The LANDUSE.TBL was used by all land surface model (LSM) options prior to Version 3.1. The VEGPARM.TBL is used by the Noah and RUC LSMs. The PX LSM uses data defined in module_sf_ssib.F. The model reads fields from LANDUSE.TBL first, but then may be overwritten by values in VEGPARM.TBL if there is an overlap.