Geographic features and chronology statistics for our study sites.

Note:†Standard ring-width chronologies were developed for eight stands (A-H) using conservative detrending methods based primarily on the negative exponential function or linear regression with any slope. Species-specific standard chronologies were developed for L. sibirica, L. gmelinii and P. sylvestris, respectively.*We determined the reliable time span for built chronologies according to the criteria of EPS (Expressed Population Signal) >0.85.注：本研究针对8个样地（A-H）构建了标准树轮宽度年表（Standard ring-width chronologies），所用保守去趋势方法主要以负指数函数或任意斜率的线性回归为基础。研究分别针对西伯利亚落叶松（L. sibirica）、兴安落叶松（L. gmelinii）和欧洲赤松（P. sylvestris）建立了物种特异性标准年表。我们依据群体信号表达量（Expressed Population Signal, EPS）>0.85的判定准则，确定了所构建年表的可靠时间跨度。