Universite Grenoble Alpes, Institut National de Recherche Pour Agriculture, Alimentation et Environnement (INRAE), Laboratoire EcoSystemes et Societes En Montagne (LESSEM), Grenoble, France.
Forest Biology Center, Institute of Environmental Biology, Adam Mickiewicz University, Poznań, Poland.
Ecol Lett. 2024 Sep;27(9):e14500. doi: 10.1111/ele.14500.
The fundamental trade-off between current and future reproduction has long been considered to result in a tendency for species that can grow large to begin reproduction at a larger size. Due to the prolonged time required to reach maturity, estimates of tree maturation size remain very rare and we lack a global view on the generality and the shape of this trade-off. Using seed production from five continents, we estimate tree maturation sizes for 486 tree species spanning tropical to boreal climates. Results show that a species' maturation size increases with maximum size, but in a non-proportional way: the largest species begin reproduction at smaller sizes than would be expected if maturation were simply proportional to maximum size. Furthermore, the decrease in relative maturation size is steepest in cold climates. These findings on maturation size drivers are key to accurately represent forests' responses to disturbance and climate change.
长期以来，人们一直认为，当前繁殖和未来繁殖之间的基本权衡会导致那些能够长得很大的物种开始繁殖时体型更大。由于达到成熟所需的时间很长，因此树木成熟大小的估计仍然非常罕见，我们缺乏对这种权衡的普遍性和形状的全球观点。利用来自五大洲的种子生产数据，我们估计了跨越热带到北方气候的 486 个树种的成熟大小。结果表明，一个物种的成熟大小随最大大小而增加，但不成比例：最大的物种开始繁殖时的体型比仅根据最大大小预计的要小。此外，相对成熟大小的下降在寒冷气候中最为陡峭。这些关于成熟大小驱动因素的发现是准确表示森林对干扰和气候变化的反应的关键。
