Surface water samples from the Maolan National Natural Reserved Park (MNNRP) were analyzed from Sept. 2013 to June 2014, for major ion concentrations (K⁺, Na⁺, Ca²⁺, Mg²⁺, Cl⁻, SO₄²⁻, HCO₃⁻), δ¹³C-DIC and δ³⁴S-SO4²⁻ to quantify the sources of solutes and chemical weathering. The results show that HCO₃⁻ and SO₄²⁻ are the main anions in Banzhai watershed, which account for 86.2 and 10.4% of the total anion equivalent, respectively. While Ca²⁺ and Mg²⁺ account for 76.9 and 20.5%, respectively. Considerable Mg²⁺ in stream water indicates that it may be affected by dolomite weathering. stream water samples present the δ¹³C-DIC values in the range of −16.9‰~−10.8‰ (mean value was −13.9‰), which were lower than that of the groundwater. The δ³⁴S-SO₄²⁻ values ranged from −15.2‰ to 1.7‰ (mean value was −4.4‰). There was a negative correlation between HCO₃⁻ content and δ¹³C value, implying the result of the interaction of temperature and precipitation intensity in different seasons. The significant positive correlation between SO₄²⁻ content and δ¹³C-DIC indicates that H₂SO₄ may be involved in the weathering process of carbonate rocks in small watershed scale. The content of SO₄²⁻ in a school sample site was much higher than that of other sample sites for the interference from human sources. The δ³⁴S values show that the average δ³⁴S-SO₄²⁻ in most sites is close to the δ³⁴S isotopic values of Guizhou coal and rain, indicating that they may be affected by local coal.

中文翻译：

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典型西南喀斯特小流域溪流水的碳和硫同位素稳定特征

从茂兰国家自然保留公园（MNNRP）地表水样品进行分析，从2013年9月到2014年6月，为主要的离子浓度（K ⁺，钠⁺，钙²⁺，镁²⁺，氯^-，SO ₄ ^2-， HCO ₃ ^- ），δ ¹³ C-DIC和δ ³⁴ S-SO 4 ^2-以量化溶质和化学风化的来源。结果表明，HCO ₃ ^-和SO ₄ ^2-在Banzhai主阴离子分水岭，分别占86.2和阴离子等效总的10.4％。而Ca ²⁺和Mg^2+分别占76.9和20.5％。溪流水中大量的Mg ²⁺表明它可能会受到白云石风化的影响。流的水样呈现δ ¹³ C-DIC值-16.9‰〜-10.8‰范围内（平均值为-13.9‰），其明显低于地下水的下部。的δ ³⁴ S-SO _4倍^2-的值从-15.2‰至1.7‰范围（平均值为-4.4‰）。有HCO之间呈负相关₃ ^-含量和δ ¹³ C值，这意味着温度和降水强度在不同的季节的相互作用的结果。SO ₄ ²⁻含量与δ之间呈显着的正相关¹³ C-DIC表明H ₂ SO ₄可能参与了小流域碳酸盐岩的风化过程。由于人为干扰，学校采样点的SO ₄ ^2-含量远高于其他采样点。的δ ³⁴价值观表明平均δ ³⁴ S-SO ₄ ^2-在大多数网站接近δ ³⁴贵州煤和雨的同位素值，这表明它们可以通过本地煤的影响。