Young savanna trees can quickly grow back from belowground storage structures after topkill. This capacity is a tolerance trait that confers persistence at the plant individual level, enabling them to survive diverse disturbance regimes.

We simulated the growth of a single resprouting stem (without and with fire) of a deciduous tree species that allocates its photo-assimilates during the vegetation season to reserves, belowground and aboveground parts (leaves and stem). As savannas grow under highly seasonal climates, the model considers that trees are leafless during the dry season and following growth is only possible thanks to reserves. Stem architecture constrains the leaf biomass to be proportional to stem length rather than biomass. We compared the success of different allocation strategies, with and without fire and according to the seasonality. To do so, the height of the resprouting stem after 50 yrs and the time to reach 2 m were modeled for three species of a humid savanna.

The viable and faster growth strategies are those for which allocation to belowground parts is <40%. There is very little sensitivity to allocation to reserves since successful growth is observed for allocation to reserves between 0.5% and 85% of photo-assimilates. In the literature and in our results, there is little impact of fire on the stem height or the time needed to escape the fire trap. Our model suggests that (1) allocation to leaves is determinant as leaves are the primary source of assimilates that can then be turned into fire-resistant structures (reserves and roots) and (2) fire only weakly slows down the plant growth compared to dry season..

杀死大树后，年轻的热带稀树大树可以从地下存储结构中迅速长出来。这种能力是一种耐性特质，可赋予植物个体以持久性，使他们能够在各种干扰条件下生存。

我们模拟了一个落叶树种的单个重生茎（无芽和有火）的生长，该茎在植被季节将其光同化物分配到保护区，地下和地上部分（叶子和茎）。由于稀树草原在高度季节性的气候下生长，因此该模型认为干旱季节树木无叶，而只有在有储备的情况下才有可能生长。茎结构限制叶片生物量与茎长成正比，而不是与生物量成正比。我们根据季节，比较了有无火的不同分配策略的成功率。为此，对三种潮湿的热带稀树草原模拟了50年后发芽茎的高度和达到2 m的时间。

可行且较快的增长策略是分配给地下部分的策略<40％。对储备的分配几乎没有敏感性，因为在0.5％至85％的光同化物中观察到对储备的成功增长。在文献和我们的结果中，火灾对阀杆高度或逃生陷阱的时间几乎没有影响。我们的模型表明（1）确定叶片的分配是决定性的，因为叶片是同化物的主要来源，然后可以将其转化为耐火结构（储备和根部），并且（2）与干燥相比，起火只会微弱地减慢植物的生长季节..