LIU Jiangang,ZHANG Hua,ZHU Xiaxia,et al.Grain Size and Geochemical Characteristics of Overlying Soil on Periglacial Landforms in Eastern Liaoning[J].Research of Soil and Water Conservation,2015,22(05):331-335,341.
辽东山地冰缘地貌上覆土壤粒度及元素地球化学
- Title:
- Grain Size and Geochemical Characteristics of Overlying Soil on Periglacial Landforms in Eastern Liaoning
- Keywords:
- periglacial landform; Mt. Laotudingzi; element geochemistry; grain size; chemical index of alteration
- 分类号:
- P595
- 摘要:
- 对辽东山地典型冰缘地貌上覆土壤的粒度、常微量化学元素进行测试分析，结果表明：土壤颗粒组成包括黏粒20.79%、粉粒69.54%和砂粒9.67%，平均粒径整体偏细，约为6.45Ф，不同土壤类型、地貌类型及坡向的粒度分布存在一定差异。土壤元素化学组成以SiO2（45.60%），Al2 O3（12.90%），Fe2O3（3.90%），K2O （2.17%）为主，最大比例可达73.36%。元素Ca，Na，P，Sr显著淋溶，而Mn，Ti，Cu，Zn则相对富集，其他元素迁移不甚明显。少数元素还表现出与粒度分布存在显著关联，其中K，Na，Sr，Ba多存在于砂质土壤中，而元素Ti则容易在粒度更细致的黏土颗粒中留存。化学风化指数CIA均值约为65.50，Rb/Sr约为0.70，反映风化程度较低，且长期经历干冷气候，A—CN—K三角模型表明，研究区土壤风化以脱钙钠、富铝为主，风化水平尚处于低等风化阶段中后期。
- Abstract:
- The grain-size, major elements and microelements of the overlying soil in the typical periglacial landform in Mt. Laotudingzi have been analyzed. The results showed that most of the soil particles were fine, the mean grain size ranged from 5.41Ф to 6.95Ф with an average of 6.45Ф, and the soil particles were made up of clay (20.79%) and silt (69.54%) and sand (9.67%). The distribution of grain sizes varied in different soils, landforms and aspects. The geochemical composition of soil elements are mainly dominated by SiO2 (average value 45.60%), Al2O3 (12.90%), Fe2O3 (3.90%) and K2O (2.17%), and the total proportion of them may reach up to 73.36%, which indicates that the silicate and aluminosilicate can be found widely in the soil. Under the condition of long-term chemical weathering, the amount of water soluble Ca leaching significantly increased, and it is the same as Na, P, Sr. However, the elements for low chemical reactivity are enriched at the same phase, such as Mn, Ti, Cu and Zn, and the transference of other elements is not obvious. All of the elements have been standardized by UCC. In addition, the correlation between grain-size and a few elements was observed, which could be interpreted that elements such as K, Na, Sr and Ba distributed widely in sandy soil and gradually dropped off in silt soil, while the element Ti was just reverse. The chemical index of alteration (CIA) was widely used as the index ascertaining the degree of chemical weathering, the value here ranged from 57.41 to 70.44 with an average of 65.50. With the addition of value of Rb/Sr, which ranged from 0.35 to 1.54 with an average of 0.70, it was reflected that the soil was slightly weathered and suffered long-term dry and cold climate. The introduction of the diagrammatize of A-CN-K made the research on chemical weathering intensity more direct and intuitive, as was indicated in the graph, the weathering level of samples was at mid-late stage of lower chemical weathering which was characterized by leaching of Na, Ca and enriching of Al.
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备注/Memo
收稿日期:2015-02-24;改回日期:2015-05-18。
基金项目:国家自然科学基金项目“辽东山地老秃顶子冰缘地貌植物群落稳定性研究”（41271064）
作者简介:刘剑刚(1986-),男,吉林松原人,博士研究生,主要研究方向:区域生态与环境研究。E-mail:ljgemail@126.com
通讯作者:张华(1965-),女,山东东明人,教授,博士生导师,主要研究方向:植物地理和恢复生态研究。E-mail:zhanghua0323@sina.com