Scientific Results

Assessing soil respiration by means of near-infrared diode laser spectroscopy

Year: 2004

Authors: Gianfrani L., Rocco A., Battipaglia G., Castrillo A., Gagliardi G., Peressotti A., Cotrufo MF.

Autors Affiliation: Dipto. Sci. Ambientali della Seconda, Università di Napoli, INFM-Gruppo Coordinato Napoli 2, Via Vivaldi 43, Caserta I-81100, Italy; Ist. Nazionale di Ottica Applicata, sezione di Napoli, Pozzuoli, Napoli, Italy; Dipto. Prod. Veg./Tecnologie Agrarie, Università di Udine, Udine, Italy

Abstract: High-resolution diode laser spectroscopy in the near-infrared region is applied to the accurate measurement of soil respiration. In particular, the use of a diode-laser-based spectrometer has allowed the implementation, for the first time, of a static accumulation method capable of measuring soil respiration from continuous measurements of CO2 concentrations, with minor perturbation on soil respiration as well as on CO2 transport and emission. The system has been tested in a laboratory experiment by detection of CO2 production from sandy matrices, inoculated with active soil microbes and supplied with different amounts of decomposable plant material. Respiration rates of all samples were then retrieved using a diffusion model. The results of the laboratory tests are in agreement with those expected on the basis of sample composition. Examples of operation with real soil samples are also reported. We discuss the possible field application of the system, in conjunction with closed static soil chambers.

Journal/Review: APPLIED SPECTROSCOPY

Volume: 58 (9)      Pages from: 1051  to: 1056

KeyWords: Carbon dioxide; Differential equations; Semiconductor lasers; Soils; Spectrometers; Carbon dioxide efflux measurements; High resolution diode laser spectroscopy; Soil respiration; Tunable laser diode spectroscopy; Molecular spectroscopy; Carbon dioxide; Article; Comparative study; Environmental monitoring; Equipment; Equipment design; Evaluation; Infrared spectrophotometry; Instrumentation; Laser; Methodology; Microbiology; Online system; Semiconductor; Soil; Soil pollutant; Validation study; Carbon Dioxide; Environmental Monitoring; Equipment Design; Equipment Failure Analysis; Lasers; Online Systems; Semiconductors; Soil; Soil Microbiology; Soil Pollutants; Spectrophotometry, Infrared
DOI: 10.1366/0003702041959514

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