Effect of Selected Physical Parameters on Respiration Activities in Common Polish Mineral Soils
Agnieszka Wolińska, Zofia Stępniewska, Anna Szafranek-Nakonieczna
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Institute of Biotechnology, Department of Biochemistry and Environmental Chemistry,
John Paul II Catholic University of Lublin,
Al. Kraśnicka 102, 20-718 Lublin, Poland
Pol. J. Environ. Stud. 2011;20(4):1075–1082
The aim of our study was to analyze the impact of such soil physical parameters as water potential (pF), microdiffusion of oxygen (ODR), redox potential (Eh), and air porosity (Eg) on respiration activity (RA), defined as CO2 evolution after a 10-day soil incubation at 20ºC. Moisture content was determined for a range of pF values (0, 1.5, 2.2, 2.7, and 3.2) that corresponded to water availability for usability by microorganisms and plant roots. Selected soil samples were extracted from the following soils layers: surface (0-30 cm), subsurface (30-60 cm), and subsoil (60-100 cm), and were classified (FAO) as Orthic Podzol, Eutric Histosol, and Haplic Phaeozem. ODR, Eh, and Eg increased with higher soil water tension, but generally a high variability of a examined factors was observed. Respiration processes in the surface layers were the most intensive (71.5- 91.2 mg CO2 kg-1d-1), whereas those in the subsurface and the subsoil samples were reduced by 65-98% to the level 1.6-19.2 mg CO2 kg-1d-1. Our results revealed significant (p<0.001) relationships between soil RA and pF, ODR, and Eh as Eg level. However, correlation coefficients (r) varied as they were indirectly dependent on soil type and depth.