Ishim-Tobol河流域树轮宽度序列和树轮年表

本数据集包括Ishim-Tobol河流域的2个树轮宽度序列和2个树轮年表。选择人为活动及自然灾害影响小的地区，宜选择土层较薄、坡度较陡、树龄较长、年轮清晰的针叶树种；使用生长锥在距离地面1.3m左右钻取树芯样本。共采集143棵苏格兰松和白桦的263根树芯，经自然风干后使用白乳胶固定在特质木槽中，并用砂纸打磨至清晰。使用Epson12000XL扫描成像，并使用CDendro 9.4软件测量树轮宽度。使用COFECHA和ARSTAN程序进行交叉定年并基于负指数函数去除生长趋势，最终建立树轮宽度差值年表。该数据集可用于河流流量重建。扩展后的流量记录揭示了该流域近229年来的水文变化。1788-2016年重建流量长期低于平均值，表明流域内干旱亏水状况较为突出。这一现象受到北大西洋和北冰洋水汽输送的显著影响。This dataset contains 2 tree-ring width series and 2 tree-ring chronologies from the Ishim-Tobol River Basin. Sampling sites were selected in areas with minimal anthropogenic and natural disaster impacts, where coniferous tree species with thin soil layers, steep slopes, long tree ages, and distinct tree rings were preferred. Tree cores were collected using an increment borer at approximately 1.3 meters above the ground. A total of 263 tree cores were obtained from 143 Scots pine (Pinus sylvestris) and birch (Betula) individuals. After natural air-drying, the cores were fixed in custom-made wooden troughs with white latex and sanded until the tree rings were clearly visible. The samples were scanned using an Epson 12000XL scanner, and tree-ring widths were measured with CDendro 9.4 software. Cross-dating was conducted using COFECHA and ARSTAN programs, and the growth trend was removed via a negative exponential function, ultimately establishing the tree-ring width residual chronology. This dataset can be utilized for streamflow reconstruction. The extended streamflow record reveals hydrological variations in the basin over the past 229 years. From 1788 to 2016, the reconstructed streamflow remained consistently below the long-term average, indicating prominent water deficit and drought conditions in the basin. This phenomenon is significantly influenced by water vapor transport from the North Atlantic and Arctic Oceans.