Wildfires are the main disturbance of boreal ecosystems, one of the largest reservoirs of terrestrial carbon. Two-thirds of boreal forests are in Siberia, where peatlands commonly appear mixed with mineral soils. Siberian forests are currently facing a dual shift in environmental conditions regarding climate change and increased fire activity. Therefore, assessing growth patterns of trees subjected to different disturbance regimes is essential to understand the impact of ongoing environmental changes on forest functioning. Following a dendroecological approach, we aimed at analyzing spatial synchrony (â_C) patterns of trees subjected to different ecohydrological and fire disturbance conditions in forests of Pinus sylvestris of south-western Siberia. Furthermore, we assessed growth suppression as a proxy for fire occurrence based on tree-ring width chronologies after removing climate signals. Our results endorsed climate as the main driver of â_C, which showed different trends depending on substrate type. A release of temperature constraints in the more temperature-limited peat soils led to decreasing â_C from mid-1960s onwards, while the opposite pattern was found in mineral soils where stronger reliance on summer precipitation progressively increased â_C. However, frequently burned stands suffered a sharp reduction in â_C since 1980s likely due to the decoupling of growth from climate as a result of an increase in fire activity. Strong replication of growth suppressions supported by historical and palaeoecological records pointed to 1915, 1952, 1977, 1983, 2003 and 2012 as potential fire years. Post-fire legacies on tree growth after such fire events lasted from one to five years, although differences were modulated by soil type, fire event, growth rate prior fire and tree age. This study highlights the usefulness of addressing spatial synchrony in tree growth and past growth suppressions to disentangle the impacts of climate change and increased fire occurrence on boreal forests.

野火是北方生态系统的主要干扰，北方生态系统是最大的陆地碳库之一。三分之二的北方森林位于西伯利亚，那里的泥炭地通常与矿质土壤混合。西伯利亚森林目前正面临气候变化和火灾活动增加等环境条件的双重转变。因此，评估受到不同干扰的树木的生长模式对于了解持续的环境变化对森林功能的影响至关重要。遵循树木生态学方法，我们旨在分析樟子松森林中受到不同生态水文和火灾干扰条件的树木的空间同步（â _C）模式。西伯利亚西南部。此外，我们根据去除气候信号后的年轮宽度年表评估了生长抑制作为火灾发生的代理。我们的结果表明气候是â _C的主要驱动因素，根据基材类型显示出不同的趋势。在导致降低更多个温度限制泥炭土温度约束条件的释放â _Ç从20世纪60年代中期起，而相反的图案矿质土壤中，其中上降水较强的依赖逐渐增加发现â _Ç。然而，经常被烧毁的看台的â _C自 1980 年代以来，可能是由于火灾活动增加导致增长与气候脱钩。历史和古生态记录支持的生长抑制的强烈复制表明 1915、1952、1977、1983、2003 和 2012 年是潜在的火灾年份。尽管差异受土壤类型、火灾事件、火灾前的生长速度和树龄的调节，但此类火灾事件后树木生长的火灾后遗产持续了 1 到 5 年。这项研究强调了解决树木生长和过去生长抑制的空间同步问题的有用性，以解决气候变化和北方森林火灾发生增加的影响。