Effect of soil sieving on respiration induced by low-molecular-weight substrates
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Department of Geology and Soil Science, Mendel University in Brno, Zemìdìlská 3, 613 00 Brno, Czech Republic
CzechGlobe - Global Change Research Centre AS CR, v.v.i., Bìlidla 986/4a, 603 00 Brno, Czech Republic
Int. Agrophys. 2014, 28(1): 119–124
The mesh size of sieves has a significant impact upon soil disturbance, affecting pore structure, fungal hyphae, proportion of fungi to bacteria, and organic matter fractions. The effects are dependent upon soil type and plant coverage. Sieving through a 2 mm mesh increases mineralization of exogenously supplied carbohydrates and phenolics compared to a 5 mm mesh and the effect is significant (p<0.05), especially in organic horizons, due to increased microbial metabolism and alteration of other soil properties. Finer mesh size particularly increases arabinose, mannose, galactose, ferulic and pthalic acid metabolism, whereas maltose mineralization is less affected. Sieving through a 5 mm mesh size is suggested for all type of experiments where enhanced mineralization of low-molecular-weight organic compounds needs to be minimalized.