中国地质2025，Vol.52Issue(3)：773-785,13.DOI:10.12029/gc20230731001
绿洲农田土壤黏土矿物特征及其对土壤养分、重金属元素吸附的影响——以新疆开孔河流域绿洲区为例
Characteristics of clay minerals in oasis farmland soil and their effects on adsorption of soil nutrients and heavy metal:A case study of the oasis area in the Kaikong river basin,Xinjiang
摘要
Abstract
This paper is the result of environmental geological survey engineering. [Objective]Clay minerals play a crucial role in soil quality regulation.Identifying the clay mineral characteristics of farmland soil in arid oasis areas is of great significance to soil quality control and agricultural development.[Methods]This study focused on the farmland soil in the arid oasis area of the Kaidu-Kongque River Basin,Bayingolin Mongolian Autonomous Prefecture,Xinjiang,and explored the characteristics of clay minerals composition,provenance evolution,soil-forming climatic conditions and their influence on soil quality through systematic analysis methods including X-ray diffraction pattern analysis,correlation analysis,triangular diagram analysis and weathering index analysis.[Results]The dominant clay mineral types in the study area are 2∶1 illite,illite/smectite mixed-layer minerals,and chlorite,with a minor presence of kaolinite.The evolution sequence of the clay minerals,which originate from granite,is illite→illite/smectite mixed-layer mineral→chlorite and kaolinite.The illite crystallinity(IC value)ranges from 0.35 to 0.62,with an average of 0.44.The chemical alteration index(CIA value)ranges from 51.29％to 62.57％,averaging 58.24％.The compositional variation index(ICV value)ranges from 1.09 to 3.69,averaging 2.65.These indicators suggest a pedogenesis environment with low temperatures,aridity,and relatively weak weathering intensity.The total clay mineral content in the study area shows a positive correlation with soil nutrients and heavy metal elements.[Conclusions]The clay minerals assemblage in the oasis area of the Kaidu-Kongque River Basin is of the illite-illite/smectite mixed-layer mineral-chlorite type.Clay minerals play a significant role in enhancing soil nutrient levels and immobilizing heavy metal elements through adsorption,thereby improving soil quality.关键词
黏土矿物/重金属/土壤养分/农田土壤/干旱绿洲区/土壤质量/环境地质调查工程/巴音郭楞州/新疆Key words
clay minerals/heavy metals/soil nutrient/farmland soil/arid oasis area/soil quality/environmental geological survey engineering/Bayingolin Mongolian Autonomous Prefecture/Xinjiang分类
天文与地球科学引用本文复制引用
姚远,赵禹,刘三,苏靖,陈振宇,梁楠..绿洲农田土壤黏土矿物特征及其对土壤养分、重金属元素吸附的影响——以新疆开孔河流域绿洲区为例[J].中国地质,2025,52(3):773-785,13.基金项目
中国地质调查局项目(DD20230556)资助. Supported by the project of China Geological Survey(No.DD20230556). （DD20230556）
