Near-infrared spectroscopy to estimate the maximum temperatures reached on burned soils
Near-infrared spectroscopy to estimate the maximum temperatures reached on burned soils
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DOI：
10.2136/sssaj2006.0187
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发表时间：
2007-05-01
影响因子：
2.9
通讯作者：
Gomez, Ignacio
中科院分区：
文献类型：
--
作者：
Guerrero, Cesar;Mataix-Solera, Jorge;Gomez, Ignacio
我们研究了使用近红外(NIR)反射光谱作为一种潜在的方法来估计燃烧土壤的最高温度(MTR)。当土壤受热时，近红外光谱随着MTR的变化而变化。因此，经过校正后，这些近红外图谱可以作为指纹来估算燃烧土壤中的MTR。将近红外光谱与MTR关联的模型在所研究的五种土壤(本地模型)中都得到了成功的验证，r(2)值在97.47-98.56%之间。用所研究的五种土壤的样本构建的全球模型获得了类似的准确性，表明土壤中存在一些具有类似热敏感性的近红外检测化合物。文中还对土壤类型和加热时间对模型建立过程中的变异性的影响进行了评估和讨论。近红外光谱分析技术具有成本低、耗时少、样品前处理少、不需要化学试剂和准确度高等优点。结果表明，利用近红外光谱技术可以估算火烧土壤的MTR，为研究野火对土壤的影响提供了一个新的视角。
We studied the use of near-infrared (NIR) reflectance spectroscopy as a potential method to estimate a posteriori the maximum temperatures reached (MTR) on burned soils. When soils are heated, the NIR spectra change in accordance with the MTR. Thus, after calibrating, these patterns of NIR could be used as a fingerprint to estimate the MTR in burned soils. Successful validations of the models relating NIR spectra with MTR were obtained in each of the five soils studied (local models), with r(2) values ranging from 97.47 to 98.56%. A global model constructed with samples from the five soils studied obtained a similar accuracy, suggesting the presence in soils of some NIR-detectable compounds with similar thermal sensitivity. The influence of the variability caused by the soil type and the duration of heating during model constructions is also evaluated and discussed. The use of NIR presents interesting advantages, such as low cost, low time consumption, minimal pretreatment of samples, no need for chemicals, and accuracy. The results indicate that the MTR could be estimated in burned soils with NIR offering a new perspective on studies of wildfire effects on soils.