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The dataset includes tree-ring width (BAI) series, along with stable carbon isotopes (δ¹³Ccor), nitrogen isotopes (δ¹⁵N), and carbon-to-nitrogen ratio (C/N ratio), collected from chestnut (Castanea mollissima), oak (Quercus aliena), and Chinese pine (Pinus tabulaeformis) in the Qinling Mountains.本数据集涵盖树木年轮宽度（BAI）序列，以及稳定碳同位素（δ¹³Ccor）、氮同位素（δ¹⁵N）与碳氮比（C/N比）数据，采集自秦岭山脉的板栗（Castanea mollissima）、槲栎（Quercus aliena）和油松（Pinus tabulaeformis）。