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首页> 美国卫生研究院文献>Journal of Visualized Experiments : JoVE >Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
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Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management

机译：农业管理下与土壤碳酸盐浓度相关的土壤侵蚀与沉积的测绘模式

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摘要

Spatial patterns of soil erosion and deposition can be inferred from differences in ground elevation mapped at appropriate time increments. Such changes in elevation are related to changes in near-surface soil carbonate (CaCO3) profiles. The objective is to describe a simple conceptual model and detailed protocol for repeatable field and laboratory measurements of these quantities. Here, accurate elevation is measured using a ground-based differential global positioning system (GPS); other data acquisition methods could be applied to the same basic method. Soil samples are collected from prescribed depth intervals and analyzed in the lab using an efficient and precise modified pressure-calcimeter method for quantitative analysis of inorganic carbon concentration. Standard statistical methods are applied to point data, and representative results show significant correlations between changes in soil surface layer CaCO3 and changes in elevation consistent with the conceptual model; CaCO3 generally decreased in depositional areas and increased in erosional areas. Maps are derived from point measurements of elevation and soil CaCO3 to aid analyses. A map of erosional and depositional patterns at the study site, a rain-fed winter wheat field cropped in alternating wheat-fallow strips, shows the interacting effects of water and wind erosion affected by management and topography. Alternative sampling methods and depth intervals are discussed and recommended for future work relating soil erosion and deposition to soil CaCO3.
机译：可以根据在适当的时间增量处绘制的地面高程的差异来推断土壤侵蚀和沉积的空间格局。海拔的这种变化与近地表土壤碳酸盐（CaCO3）剖面的变化有关。目的是描述用于这些量的可重复现场和实验室测量的简单概念模型和详细协议。在这里，使用地面差分全球定位系统（GPS）测量准确的海拔；其他数据采集方法可以应用于相同的基本方法。从规定的深度间隔中收集土壤样品，并在实验室中使用高效且精确的改良压力计方法对无机碳浓度进行定量分析。将标准统计方法应用于点数据，代表性结果表明，土壤表层CaCO3的变化与海拔高度的变化之间具有显着的相关性，与概念模型一致。 CaCO3通常在沉积区域减少，而在侵蚀区域增加。地图是从海拔和土壤碳酸钙的点测量得出的，以帮助进行分析。研究地点的侵蚀和沉积模式图（雨育的冬小麦田种植有交替的小麦小条）显示了受管理和地形影响的水蚀和风蚀的相互作用。讨论了其他采样方法和深度间隔，并建议将其用于将土壤侵蚀和沉积与土壤CaCO3相关的未来工作。

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