Knowledge Resource Center for Ecological Environment in Arid Area
| 浑善达克沙地天然水体的水化学及水-沙相互作用研究 | |
| 其他题名 | The ion chemistry of natural water and water-sand interaction in the Hunshandake Sandy Land |
| 任孝宗 | |
| 出版年 | 2014 |
| 学位类型 | 博士 |
| 导师 | 杨小平 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 通过对浑善达克沙地东部地下水、湖水、河水、泉水和降水的水化学分析发现该地区天然水体为TDS小于1g/L的淡水，地表水和地下水的物理参数有明显差异：地下水为弱酸性~中性而地表水为中性~碱性，且地下水其他水体物理参数如Eh、TDS、EC、盐度、碱度及硬度均高于地表水。 滦河流域地表水主导阴离子为HCO3-，无主导阳离子，Ca2+和Mg2+为重要的优势阳离子。西拉木伦河流域地下水分两种类型，I型地下水以HCO3-和Ca2+为主导阴阳离子；II型地下水以SO42-为主导阴离子或无主导阴离子而以SO42-和Cl-为优势阴离子，Ca2+为主导阳离子或无主导阳离子而以Ca2+为重要的优势阳离子。Gibbs投影图表明浑善达克沙地东部地区的天然水中阴阳离子主要来自岩石风化。采用离子比值法进一步研究发现，地表水和I型地下水水化学成分碳酸盐岩+硅酸盐岩来源大于蒸发岩源；II型地下水碳酸盐岩+硅酸盐岩来源小于蒸发岩源。Durov扩展三线图也表明I、II型地下水水化学组成上的差异是由于溶解作用造成的。 浑善达克沙地剖面可溶盐pH值为中性~弱碱性，TDS含量小于110 mg/L。赛罕锡林剖面（SX）表层风成沙可溶盐以HCO3-和Ca2+为主导阴阳离子；底层风成沙可溶盐以HCO3-为主导阴离子，无主导阳离子而Ca2+和Mg2+为重要的优势阳离子；古土壤可溶盐兼有表层风成沙和底层风成沙的特点。巴彦诺尔剖面（BN）表层风成沙、古土壤层及底层风成沙可溶盐基本都以HCO3-和Ca2+为主导阴阳离子。此外，通过对沙漠剖面可溶盐的研究发现沉积序列中Cl-/(Cl- + HCO3-)、Cl- 、SO42-、HCO3-/ Cl-、HCO3-/ SO42-、HCO3-/ (Cl- + SO42-)、Mg2+和Ca2+等在风成沙、古土壤层之间存在明显的差异，并且其随剖面深度的变化与气候代用指标TOC及Mz有很好的对应关系，表明沙漠可溶盐的离子参数可以作为一种有效的气候代用指标。 |
| 英文摘要 | It is found that the surface and ground waters in the eastern Hunshandake Sandy Land are fresh with TDS less than 1g/L, by analyzing the ion chemistry of ground waters, lakes, rivers, springs and precipitation water samples. The surface and ground waters are different in their physics water parameters: the ground waters are weak acidic to neutral while the surface waters are neutral to alkalic; Eh, TDS, EC, salinity, alkalinity and hardness are higher in ground waters than in surface waters. Surface waters of Luanhe river basin are HCO3- dominant and cations indiscriminant with Ca2+ and Mg2+ important. The ground waters of Xilamulun river basin are consisted of two types of ion chemistry. Type I are HCO3- and Ca2+ dominant; type II are SO42- dominant or anion indiscriminant with SO42-and Cl- important for anion chemistry, and Ca2+ dominant or cations indiscriminant with Ca2+ important for cation chemistry. The Gibbs diagrams show that the main cations and anions of natural waters in eastern Hunshandake Sandy Land are rock dominant. The ratio comparing method further indicates that more solutes in surface waters and Type I ground waters are from dissolving of carbonate and silicate rocks rather than that of evaporites; more solutes in Type II ground waters are from dissolving of evaporites rather than from dissolving of carbonate and silicate rocks. The soluble salts of sedimentary sequences occurring in the Hunshandake Sandy Land are neutral to alkalic with TDS less than 110 mg/L. The soluble salts of surface aeolian sand in section of Saihanxilin (SX) are HCO3- and Ca2+ dominant; the soluble salts of bottom aeolian sand are are HCO3- dominant and cations indiscriminant with Ca2+ and Mg2+ important; and that of the paleosoil are medial products between the two end-member. The soluble salts of surface aeolian sand, paleosoil and bottom aeolian sand in section of Bayan Nur (BN) are HCO3- and Ca2+ dominant. The soluble salts parameters of sedimentary sequences such as Cl-/(Cl- + HCO3-), Cl-, SO42-, HCO3-/ Cl-, HCO3-/ SO42-, HCO3-/ (Cl- + SO42-), Mg2+ and Ca2+ are different between aeolian sand and paleosoil. Moreover, their variation in depth are consistent with that of climate proxies of TOC and Mz, which indicate that the parameters of soluble salts in sedimentary sequences of sandy land are efficient climate proxies. |
| 中文关键词 | 浑善达克沙地 ; 水化学 ; 沉积剖面 ; 可溶盐 |
| 英文关键词 | Hunshandake Sandy Land ion chemistry sedimentary sequences soluble salts |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 第四纪地质学 |
| 来源机构 | 中国科学院地质与地球物理研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287370 |
| 推荐引用方式 GB/T 7714 | 任孝宗. 浑善达克沙地天然水体的水化学及水-沙相互作用研究[D]. 中国科学院大学,2014. |
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