Predicting Soil Phosphorus-Related Properties Using Near-Infrared Reflectance Spectroscopy
Predicting Soil Phosphorus-Related Properties Using Near-Infrared Reflectance Spectroscopy
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DOI：
10.2136/sssaj2012.0155
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发表时间：
2012-11-01
影响因子：
2.9
通讯作者：
Parent, Leon-Etienne
中科院分区：
文献类型：
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作者：
Abdi, Dalel;Tremblay, Gaetan F.;Parent, Leon-Etienne
近红外反射光谱(NIRS)是一种快速、廉价、准确的多种物质分析技术，在土壤科学中得到越来越广泛的应用。本研究旨在探讨近红外光谱(NIRS)对土壤磷含量的预测能力[Mehlich 3(M3P)和水分(CP)1]、土壤全磷(TP)、年作物磷吸收和年磷收支，以及(Ii)其他土壤化学性质[全C(TC)、全N(TN)、pH和由Mehlich 3提取的K、Al、Fe、Ca、Mg、Mn、铜和锌]。土壤样本(n=448)取自加拿大魁北克Levis的一个试验点，在那里Timothy(Pholum pratense L.)在四种磷肥和氮肥组合下生长。近红外光谱方程的建立使用了80%的样品用于校准，20%的样品用于验证。用验证决定系数(12，2)和预测标准差与标准差之比(RPD)评价近红外光谱的预测能力。结果表明，NIRS(R-v(2)<；0.70和RPD<；1.75)不能准确地预测M3P、CP、作物年吸磷量和年P收支。K和Cu也有类似的结果。然而，近红外光谱对总磷、总氮、铁和锌(0.70)的预测是中等有用的
Near-infrared reflectance spectroscopy (NIRS) is a rapid, inexpensive, and accurate analysis technique for a wide variety of materials, and it is increasingly used in soil science. The objectives of our study were to examine the potential of NIRS to predict (i) soil P extracted by two methods [Mehlich 3 (M3P) and water (Cp)1, soil total P (TP), annual crop P-uptake, and annual P-budget, and (ii) other soil chemical properties [total C (TC), total N (TN), pH, and K, Al, Fe, Ca, Mg, Mn, Cu, and Zn extracted by Mehlich 3]. Soil samples (n = 448) were taken over a 7-yr period from an experimental site in Levis (Quebec, Canada) where timothy (Phleum pratense L.) was grown under four combinations of P and N fertilizer. The NIRS equations were developed using 80% of the samples for calibration and 20% for validation. The predictive ability of NIRS was evaluated using the coefficient of determination of validation (12,2) and the ratio of standard error of prediction to standard deviation (RPD). Results show that M3P, Cp, crop annual P-uptake, and annual P-budget were not accurately predicted by NIRS (R-v(2) < 0.70 and RPD < 1.75). Similar results were found for K and Cu. However, NIRS predictions were moderately useful for TP, TN, Fe, and Zn (0.70