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Assessing the suitability of rotary corers for sampling exchangeable cations in rocky soils.

机译：评估旋转式取样机是否适合在岩石土壤中取样可交换阳离子。

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摘要

Ecosystem budgets have been compiled and analyzed with the knowledge that inherent uncertainties exist in natural variability, analytical methods, sampling design, and model selection; however, these uncertainties are rarely propagated through ecosystem budget calculations. Soils are a particularly important area of uncertainty research due to their inherent spatial complexity and the difficulty of accurately sampling soil properties to encompass their variance across space and through the soil profile. A method of soil coring which utilizes a diamond-tipped, motor-driven, rotary corer may increase the expedience of sampling at depth and allow for a sampling scheme that is more representative of spatial variation compared to the use of traditional quantitative soil pits. However, the technique may be limited when attempting to characterize exchangeable cation concentrations of soils due to the grinding action of the corer. We found that soils from cored samples had elevated concentrations of exchangeable cations as compared to quantitative soil pits at sites in Nevada, California, New York, and New Hampshire. We also determined that the contamination in cored samples that is introduced when the corer is inserted and removed during sampling increased estimates of soil mass, exchangeable cations content, %C, and %N. The problem of contamination from inserting and removing the corer was more severe at the NH site, where a deep organic layer was present. Overall, we found that the corer increased concentrations of some cations at all four study sites, though the magnitude of this increase and the specific cations affected differed between sites. We suggest that the rotary corer may not provide precise measurements of soil properties relative to soil pits; however the rotary corer has the advantage of being a quick method for sampling at depth and can more accurately characterize spatial variability with the same effort needed to dig a quantitative pit. Thus, the corer may be appropriate for some study designs, particularly studies that are interested in using this sampling method to assess change over time.;Key Words: Uncertainty, ecosystem, soil, coring, sampling, hardwood forest, Monte Carlo, error analysis
机译：编制和分析生态系统预算时要了解自然可变性，分析方法，抽样设计和模型选择中存在内在的不确定性；但是，这些不确定性很少通过生态系统预算的计算来传播。由于土壤固有的空间复杂性以及难以准确采样土壤性质以涵盖其在整个空间和整个土壤剖面中的变化的能力，土壤是不确定性研究的一个特别重要的领域。与传统的定量土坑相比，利用菱形尖头，电机驱动的旋转式挖心机进行土壤取心的方法可以增加深度采样的便利性，并允许采用更能代表空间变化的采样方案。然而，由于去核剂的研磨作用，当试图表征土壤的可交换阳离子浓度时，该技术可能会受到限制。我们发现，与内华达州，加利福尼亚州，纽约州和新罕布什尔州的定量土坑相比，取芯样品的土壤中可交换阳离子的浓度较高。我们还确定，在取样过程中插入和取出去核剂时引入的去核样品中的污染会增加对土壤质量，可交换阳离子含量，％C和％N的估计。在存在深有机层的NH位置，插入和移除芯子造成的污染问题更加严重。总体而言，我们发现Corer增加了所有四个研究地点的某些阳离子的浓度，尽管这种增加的幅度和受影响的具体阳离子在不同地点之间有所不同。我们建议旋转式取芯机可能无法提供相对于土坑的土壤特性的精确测量；但是，旋转式取芯机的优点是可以快速进行深度采样，并且可以通过挖掘定量坑所需的相同工作来更准确地表征空间变异性。因此，核心分析器可能适合某些研究设计，尤其是对使用这种采样方法评估随时间变化的研究感兴趣。关键词：不确定性，生态系统，土壤，取心，采样，硬木森林，蒙特卡洛，误差分析

著录项

  • 作者

    Levine, Carrie R.;

  • 作者单位

    State University of New York College of Environmental Science and Forestry.;

  • 授予单位 State University of New York College of Environmental Science and Forestry.;
  • 学科 Agriculture Soil Science.;Environmental Sciences.
  • 学位 M.S.
  • 年度 2011
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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