中文摘要：

通过野外采样和室内分析，采用稳定氢氧同位素和水化学相结合的方法，研究了第二松花江地表水和地下水的相互关系。地表水和地下水中稳定氢氧同位素（δD，δ18O）空间差异明显，上游水体中同位素最贫化，下游最富集。水化学类型从长白山源区的Na-HCO3型，演化成Ca-Mg-HCO3型；而在人类活动的影响下，向Ca（Mg）-Cl（SO4）演化。运用端元法定量计算了地表水与地下水的相互转换比例，上游山区深层地下水接受江水和浅层地下水的补给，浅层地下水补给比例占50%左右；下游平原区浅层地下水补给江水，补给比例占20%左右。研究结果可为综合利用地表水和地下水、促进水资源的可持续利用提供理论基础。

英文摘要：

The relationship between surface water and groundwater is an important content of the research on the water cycle and water resource management. The methods of field water sampling and laboratory analysis were combined with the stable isotopes （δD, δ18O） and hydrochemistry to study the relationship between surface water and groundwater in the second Songhua River basin. The spatial difference of stable isotopes in the surface water and groundwater was obvious. The water samples in the upstream were isotopically depleted, but isotopically enriched in the downstream. The evolution of water type ranged from the Na-HCO3 type in the Changbai Mountain area to the Ca-Mg-HCO3 type. However, the evolution of water type was Ca（Mg）-Cl（SO4） impacted by human activities. The two-component method was used to calculate the quantitative relationship between surface water and groundwater. The deep groundwater was recharged from the river and shallow groundwater, and the contribution of shallow groundwater was about 50%. The contribution of the shallow groundwater discharged to the river was about 20% in the plain area. The results could provide the theoretical basis for the comprehensive utilization of surface water and groundwater, and the sustainable utilization of water resources.