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Diurnal oscillations in gas production (O2, CO2, CH4, and N2) in soil monoliths

Sheppard, S. K. and Lloyd, David 2002. Diurnal oscillations in gas production (O2, CO2, CH4, and N2) in soil monoliths. Biological Rhythm Research 33 (5) , pp. 577-591. 10.1076/brhm.33.5.577.13937

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Abstract

Soil cores (35 cm long, 7 cm diameter) from the Macaulay Land Use Research Institute's Sourhope Research Station in the Scottish Borders were kept and monitored at constant temperature (18± 1°C) for gas production using a 1.6 mm diameter stainless steel probe fitted with a membrane inlet and connected to a quadrupole mass spectrometer. This provided a novel method for on-line, real time monitoring of soil gas dynamics. In closed-system headspace experiments, O2 and CO2 (measured at m/z values 32 and 44, respectively) showed anti-phase diurnal fluctuations in low-intensity simulated daylight and under a light-dark (LD, 12:12 h) regime. O2 increased during periods of illumination and decreased in the dark. The inverse was true for CO2 production. Ar (m/z = 40) concentration and temperature (°C) remained constant throughout the experiments. The same phase-related oscillations, in CO2 and O2 concentrations, were observed at 2 and 5 cm depth in soil cores. The O2 concentration did not oscillate diurnally at 10 cm depth. In below-ground experiments, CH4 (m/z = 15) concentration showed diurnal cycles at 2, 5 and 10 cm depth. The CH4 production had the same diurnal phase cycle as CO2 but with lower amplitude. Evidence of below-ground diurnal oscillations in N2 (m/z = 28) concentration was provided at 5 cm depth. The scale of production and consumption of gases associated with soil-atmosphere interactions and below-ground processes, are shown to be a multifaceted output of several variables. These include light, circadian-controlled physiological rhythms of plants and microbes, and the interactions between these organisms.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Taylor & Francis
ISSN: 0929-1016
Last Modified: 04 Jun 2017 06:36
URI: http://orca.cf.ac.uk/id/eprint/62681

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