دانلود مقاله با موضوع تجزیه و تحلیل طیفی فسفر کل در خاک بر اساس تشخیص آن طیف بازتاب
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موضوع به انگلیسی:Spectral analysis of total phosphorus in soils based on its diagnostic
reflectance spectra
بخشی از متن:Visible and near infrared spectroscopy (VNIR) has been successfully used to determine many soil parameters
rapidly. However, total phosphorous (P) cannot be well quantified by VNIR, mainly because its absorption
spectrum or reflectance spectrum was too weak to be studied. Here, we explored a new way to reveal the reflectance
spectrum of total P in soils. Firstly, six types of soil residues were prepared after the original soil was
sequentially extracted Ca2‐P, Ca8‐P, Al‐P, Fe‐P, O‐P, and Ca10‐P, respectively. Secondly, the reflectance spectra
of these P fractions were obtained using these soil residues by QE65000 spectrometer (Ocean Optics).
Specifically, if we intended to get the spectrum of a certain P fraction, we would measure the reflectance spectrum
of the soil residues without its neighboring former P fraction, using the soil residues after extracting this P
fraction as the reference spectrum. Results showed that these P fractions had different characteristics of reflectance
spectrum and can be well analyzed qualitatively and quantitatively. After summarizing the diagnostic
spectra of these P fractions, the total P diagnostic spectrum was found to be distributed in 250–750 nm.
Using these diagnostic bands, the spectral model of total P was established and showed a better result. This
study provided an important evidence for understanding the characteristics of total P reflectance spectrum
in soils and predicting total P concentrations
