中文摘要：

对赣江上游河水中主要离子的水化学特征进行研究，结果显示：Ca／Sr=480-897（均值为717），Mg/Sr=191—296（均值为231），Ca／Na=0．60—2．79（均值为1．19），Mg／Na=0．19—0．66（均值为0．38），Si的浓度在4．06—6．57mg·l^-1之间，赣南流域河水中富集Na^＋和K^＋，而Mg^2＋和Ca^2＋含量相对较少，Si的含量较高且变化不大．通过海盐校正分析得出，研究区域内大气降水对河流组分的贡献率为9．90％．根据质量平衡方程模型算出流域主元素的69％来源于硅酸盐岩的风化．硅酸盐岩、碳酸盐岩和蒸发盐岩风化对溶解态锶的贡献率依次为48．3％，27．4％和4．3％．通过对主元素、锶（0．20—0．45μmol·1^-1，平均值0．32μmol·l^-1“）以及锶同位素比值（0．7165—0．7249，平均值为0．721）的综合研究，赣南流域^87Sr／^86Sr与1／Sr呈显著的正相关关系，并且从Mg／Na^＋，Ca／Na^＋，Mg／Ca，HCO3^-／（HCO；＋SO4^2-）和^87Sr／^86Sr的关系图中发现：硅酸盐岩的风化对赣南流域水体的化学组成起主要控制作用，碳酸盐岩次之，蒸发盐岩风化的影响不大，人为活动影响较小,通过锶同位素的平衡方程得出：赣南流域为大气降水和岩石风化的混合型，大气降水对赣江上游^87Sr／^86Sr的贡献率约为9．7％，岩石风化对其贡献率约为90．3％。

英文摘要：

In this paper, the twenty-three samples of watersheds in the upriver tributaries of Ganjiang river were selected for integratively analyzing the major element, the dissolved Sr （0. 20--0. 45μmol·1^-1 ）, Sr isotope （0. 7165--O. 7249） composition, we can calculate that Ca./Sr =480--897, the mean value is 717, Mg/Sr = 191--296, the mean value of it is 231, Ca/Na = 0. 60--2. 79, the mean value is 1.19, Mg/Na = 0. 19-- 0. 66, the mean value is 0. 38. and find that this watersheds is rich in Na^＋K^＋, poor in Mg^2＋ ＋ Ca^2＋ , the concentration of Si is high. According to this analysis , we can calculate that contribution rate of atmosphere to the ratio of the river is 9.90%, and find that the source of the dissolved element of watersheds is mostly from weathering of silicate rock, the carbonate rock is taking the second place , the influence of evaporation salt rock is on the small side. The proportion of source from the weathering of silicate rock , the carbonate rock, evaporated rock for dissolved Sr in the samples is 48.3%, 27.4%, 4. 3%. The research of the proportion of end member finds that the ratio of ^87Sr/^86Sr from atmosphere precipitation is 9.7%, from rock weathering is 90. 3 %. This conclusion is good indication for the study of weathering of small watershed in the subtropics.