In grassland ecosystems, the limited availability of water and the occurrence of fire are critical factors that inhibit the establishment of trees through ecological succession. Grasslands typically have a climate that does not support the high moisture needs of trees, while periodic fires, which are natural in many grassland environments, prevent tree seedlings from maturing by regularly clearing the vegetation and inhibiting their establishment. This dynamic results in a stable ecosystem dominated by grasses rather than tree species, illustrating the intricate balance of biotic and abiotic influences in ecological succession.