Estimating soil aggregate stability with infrared spectroscopy and pedotransfer functions

Thomas Chalaux Clergue , Nicolas P.A. Saby , Alexandre M.J.-C. Wadoux , Bernard G. Barthès , Marine Lacoste
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引用次数: 1

Abstract

Soil aggregate stability is an important indicator of soil condition and is directly related to soil degradation processes such as erosion and crusting. Aggregate stability is conventionally measured by testing the aggregate resistance to water disturbance mechanisms. Such measurements, however, are costly and time-consuming, which make them difficult to implement at a regional or country scale. In this study, we explore two different approaches to estimate soil aggregate stability by means of commonly-measured soil properties or mid-infrared spectroscopy measurements. The first approach relies on land use and soil properties. In the second approach aggregate stability is estimated by a model fitted with mid-infrared spectroscopic data. We tested the two approaches with a dataset composed of 202 soil samples from mainland France, in which aggregate stability was measured with a fast wetting test. We found that simple linear models based on common soil properties and models based on mid-infrared spectral data yielded similar results. Interpretation of the models revealed well-known relationships: land use had a major role in predicting aggregate stability, followed by organic carbon and clay content. Overall, we conclude that both approaches offer a reliable, cheap and time-efficient alternative to estimating soil aggregate stability. These approaches offer a tool to estimate aggregate stability over large geographical areas, which can support the development of erosive risk management plans and the implementation of adaptive management strategies to mitigate threats to soil and improve the overall soil condition.

Abstract Image

用红外光谱和土壤传递函数估算土壤团聚体的稳定性
土壤团聚体稳定性是土壤状况的重要指标,与土壤侵蚀、结壳等退化过程直接相关。骨料稳定性通常是通过测试骨料对水扰动机制的抵抗力来测量的。然而,这种测量既昂贵又费时,因此难以在区域或国家范围内实施。在这项研究中,我们探索了两种不同的方法来估计土壤团聚体的稳定性,通过常用的测量土壤性质或中红外光谱测量。第一种方法依赖于土地利用和土壤性质。在第二种方法中,用中红外光谱数据拟合的模型估计聚合稳定性。我们用来自法国大陆的202个土壤样本组成的数据集测试了这两种方法,其中通过快速湿润测试测量了团聚体稳定性。我们发现基于常见土壤特性的简单线性模型和基于中红外光谱数据的模型得出了相似的结果。对模型的解释揭示了众所周知的关系:土地利用在预测团聚体稳定性方面发挥了主要作用,其次是有机碳和粘土含量。总的来说,我们得出结论,这两种方法都提供了一种可靠、廉价和省时的替代方法来估计土壤团聚体稳定性。这些方法提供了一种评估大地理区域总体稳定性的工具,可以支持侵蚀风险管理计划的制定和适应性管理策略的实施,以减轻对土壤的威胁,改善整体土壤状况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Soil security
Soil security Soil Science
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