Study Grid
During 1988, one of us (MD) initiated the GLADES (G rid forL andscape A nalysis and DE mographicS tudy) Project with the establishment of a square 16 ha grid (consisting of 1600 10 x 10 m cells) in a portion of the CCESR oak savanna/woodland habitat. In 1995 and 1996, nearly nine thousand trees with a dbh (diameter at breast height) of at least 2 cm were tagged, each with a unique number. Their dbh and x,y location within the grid were also recorded (Davis 2021). A burn program was instituted in the grid area in 1987, and the study grid contains three different burn units, with burn numbers in the units during the twenty-five-year study (1995-2020) ranging from nine to eleven (Davis 2021). Burns took place in late April or early May and were surface fires.Q. macrocarpa and Q. ellipsoidalis represented 90% of all the trees. All trees, including each of the stems of multiple-stemmed trees, were visited annually and their statuses (live, dead standing, or dead fallen) recorded. The dbh of live stems were measured every five years (Davis 2021).