丘陵山区多目标区域地球化学调查不同成因表层土壤代表性研究——以浙江绍兴地区为例

    Representative study of different genesis soils in hilly and mountain area multi-purpose regional geochemical survey: a case study of Shaoxing, Zhejiang Province

    • 摘要: 当前, 多目标区域地球化学调查工作已逐步进入丘陵山区, 与平原区不同, 丘陵山区地质背景更复杂, 土壤成因类型和土地利用方式多变, 土壤类型多样。如何布设土壤样点以客观真实地反映区域土壤地球化学分布特征是值得关注的问题。选择浙江绍兴市区以南40 km2的丘陵山区, 按照多目标区域地球化学调查规范样品布设原则及采样要求, 以4点/km2密度采集表层土壤样品, 测定了38项元素指标含量。通过对比不同采样密度及不同成因土壤元素含量及其空间分布特征, 开展丘陵山区表层土壤采样代表性研究。结果表明, 多目标区域地球化学调查规范中的小格采样、大格组合分析方案能够很好地反映土壤元素区域地球化学分布模式; 对于大多数元素指标而言, 在丘陵山区以1点/km2密度采集能够代表采样单元格物质组成的冲积成因土壤, 可更好地满足样品代表性要求。在评价As、Mn、Mo、Al2O3、MgO、K2O等元素指标异常时, 可倾向性地采集残坡积成因土壤。研究成果为丘陵山区多目标区域地球化学调查土壤样品采集方法的完善提供了理论依据。

       

      Abstract: Currently, the multi-purpose regional geochemical survey has extended into hilly and mountain areas, which has a relatively complicated geological background, soil genetic type, land use type and soil type compared to plain areas.How to lay out surface soil samples, so as to objectively and truly reflect the soil region geochemical characteristics has become a key issue.We collected soil samples in the hilly and mountain area of 40 km2 south of Shaoxing, Zhejiang Province.According to the sample layout principle and sampling requirements of multi-purpose regional geochemical survey, collecting surface soil samples by 4 point/km2 density and measuring 38 components.We evaluate the representativeness of different genesis soils through comparing the elements content and their spatial distribution.The results showed that, the mode of small lattice sampling and large lattice combination analysis could well reflect the element regional geochemical distribution; for most elements index, sampling alluvial soils which could represent the material composition of sample cell could better meet the requirements of representativeness.In the evaluation of As, Mn, Mo, Al2O3, MgO and K2O geochemical anomalies, the residual slope soil can be collected.This study can provide theoretical basis for the improvement of soil sample collettion methods for multi-purpose region geochemical survey in hilly and mountain areas.

       

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